SELECTIVELY SETTING DSN SLICE DATA IN MOTION WITHIN DSN MEMORY BASED ON CONDITIONS AT THE FINAL DATA REST POINTS
A method for use in a distributed storage network (DSN) including multiple storage units and a distributed storage (DS) processing unit includes determining, by the DS processing unit, that at least a first storage unit is associated with a status level that fails to satisfy a threshold value associated with a first access request of a set of access requests. The DS processing unit also determines that at least a second storage unit is associated with a status level that satisfies the threshold value. The DS processing unit transmits the first access request to a performance unit, the performance unit configured to facilitate execution of alternative processing of the first access request, but transmits the second access request from the DS processing unit to the at least a second storage unit for standard processing.
This application claims priority pursuant to 35 U.S.C. §119(e) to U.S. Provisional Application No. 62/260,43, entitled “COMMUNICATING DISPERSED STORAGE NETWORK STORAGE UNIT TASK EXECUTION STATUS,” filed Nov. 30, 2015, which is hereby incorporated herein by reference in its entirety and made part of the present U.S. Utility Patent Application for all purposes.
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENTNot applicable.
INCORPORATION-BY-REFERENCE OF MATERIAL SUBMITTED ON A COMPACT DISCNot applicable.
BACKGROUND OF THE INVENTIONTechnical Field of the Invention
This invention relates generally to computer networks and more particularly to dispersing error encoded data.
Description of the Related Art
Computing devices are known to communicate data, process data, and/or store data. Such computing devices range from wireless smart phones, laptops, tablets, personal computers (PC), work stations, and video game devices, to data centers that support millions of web searches, stock trades, or on-line purchases every day. In general, a computing device includes a central processing unit (CPU), a memory system, user input/output interfaces, peripheral device interfaces, and an interconnecting bus structure.
As is further known, a computer may effectively extend its CPU by using “cloud computing” to perform one or more computing functions (e.g., a service, an application, an algorithm, an arithmetic logic function, etc.) on behalf of the computer. Further, for large services, applications, and/or functions, cloud computing may be performed by multiple cloud computing resources in a distributed manner to improve the response time for completion of the service, application, and/or function. For example, Hadoop is an open source software framework that supports distributed applications enabling application execution by thousands of computers.
In addition to cloud computing, a computer may use “cloud storage” as part of its memory system. As is known, cloud storage enables a user, via its computer, to store files, applications, etc. on an Internet storage system. The Internet storage system may include a RAID (redundant array of independent disks) system and/or a dispersed storage system that uses an error correction scheme to encode data for storage.
One or more memory units used to implement the dispersed storage system may be offline or slow due to network connection limitations or other conditions. Unfortunately, using conventional techniques to access data using these slow or offline memory units can adversely impact the performance of the system as a whole.
The DSN memory 22 includes a plurality of storage units 36 that may be located at geographically different sites (e.g., one in Chicago, one in Milwaukee, etc.), at a common site, or a combination thereof. For example, if the DSN memory 22 includes eight storage units 36, each storage unit is located at a different site. As another example, if the DSN memory 22 includes eight storage units 36, all eight storage units are located at the same site. As yet another example, if the DSN memory 22 includes eight storage units 36, a first pair of storage units are at a first common site, a second pair of storage units are at a second common site, a third pair of storage units are at a third common site, and a fourth pair of storage units are at a fourth common site. Note that a DSN memory 22 may include more or less than eight storage units 36. Further note that each storage unit 36 includes a computing core (as shown in
Each of the computing devices 12-16, the managing unit 18, and the integrity processing unit 20 include a computing core 26, which includes network interfaces 30-33. Computing devices 12-16 may each be a portable computing device and/or a fixed computing device. A portable computing device may be a social networking device, a gaming device, a cell phone, a smart phone, a digital assistant, a digital music player, a digital video player, a laptop computer, a handheld computer, a tablet, a video game controller, and/or any other portable device that includes a computing core. A fixed computing device may be a computer (PC), a computer server, a cable set-top box, a satellite receiver, a television set, a printer, a fax machine, home entertainment equipment, a video game console, and/or any type of home or office computing equipment. Note that each of the managing unit 18 and the integrity processing unit 20 may be separate computing devices, may be a common computing device, and/or may be integrated into one or more of the computing devices 12-16 and/or into one or more of the storage units 36.
Each interface 30, 32, and 33 includes software and hardware to support one or more communication links via the network 24 indirectly and/or directly. For example, interface 30 supports a communication link (e.g., wired, wireless, direct, via a LAN, via the network 24, etc.) between computing devices 14 and 16. As another example, interface 32 supports communication links (e.g., a wired connection, a wireless connection, a LAN connection, and/or any other type of connection to/from the network 24) between computing devices 12 & 16 and the DSN memory 22. As yet another example, interface 33 supports a communication link for each of the managing unit 18 and the integrity processing unit 20 to the network 24.
Computing devices 12 and 16 include a dispersed storage (DS) client module 34, which enables the computing device to dispersed storage error encode and decode data as subsequently described with reference to one or more of
In operation, the managing unit 18 performs DS management services. For example, the managing unit 18 establishes distributed data storage parameters (e.g., vault creation, distributed storage parameters, security parameters, billing information, user profile information, etc.) for computing devices 12-14 individually or as part of a group of user devices. As a specific example, the managing unit 18 coordinates creation of a vault (e.g., a virtual memory block associated with a portion of an overall namespace of the DSN) within the DSTN memory 22 for a user device, a group of devices, or for public access and establishes per vault dispersed storage (DS) error encoding parameters for a vault. The managing unit 18 facilitates storage of DS error encoding parameters for each vault by updating registry information of the DSN 10, where the registry information may be stored in the DSN memory 22, a computing device 12-16, the managing unit 18, and/or the integrity processing unit 20.
The DSN managing unit 18 creates and stores user profile information (e.g., an access control list (ACL)) in local memory and/or within memory of the DSN memory 22. The user profile information includes authentication information, permissions, and/or the security parameters. The security parameters may include encryption/decryption scheme, one or more encryption keys, key generation scheme, and/or data encoding/decoding scheme.
The DSN managing unit 18 creates billing information for a particular user, a user group, a vault access, public vault access, etc. For instance, the DSTN managing unit 18 tracks the number of times a user accesses a non-public vault and/or public vaults, which can be used to generate a per-access billing information. In another instance, the DSTN managing unit 18 tracks the amount of data stored and/or retrieved by a user device and/or a user group, which can be used to generate a per-data-amount billing information.
As another example, the managing unit 18 performs network operations, network administration, and/or network maintenance. Network operations includes authenticating user data allocation requests (e.g., read and/or write requests), managing creation of vaults, establishing authentication credentials for user devices, adding/deleting components (e.g., user devices, storage units, and/or computing devices with a DS client module 34) to/from the DSN 10, and/or establishing authentication credentials for the storage units 36. Network administration includes monitoring devices and/or units for failures, maintaining vault information, determining device and/or unit activation status, determining device and/or unit loading, and/or determining any other system level operation that affects the performance level of the DSN 10. Network maintenance includes facilitating replacing, upgrading, repairing, and/or expanding a device and/or unit of the DSN 10.
The integrity processing unit 20 performs rebuilding of ‘bad’ or missing encoded data slices. At a high level, the integrity processing unit 20 performs rebuilding by periodically attempting to retrieve/list encoded data slices, and/or slice names of the encoded data slices, from the DSN memory 22. For retrieved encoded slices, they are checked for errors due to data corruption, outdated version, etc. If a slice includes an error, it is flagged as a ‘bad’ slice. For encoded data slices that were not received and/or not listed, they are flagged as missing slices. Bad and/or missing slices are subsequently rebuilt using other retrieved encoded data slices that are deemed to be good slices to produce rebuilt slices. The rebuilt slices are stored in the DSTN memory 22.
The DSN interface module 76 functions to mimic a conventional operating system (OS) file system interface (e.g., network file system (NFS), flash file system (FFS), disk file system (DFS), file transfer protocol (FTP), web-based distributed authoring and versioning (WebDAV), etc.) and/or a block memory interface (e.g., small computer system interface (SCSI), internet small computer system interface (iSCSI), etc.). The DSN interface module 76 and/or the network interface module 70 may function as one or more of the interface 30-33 of
In the present example, Cauchy Reed-Solomon has been selected as the encoding function (a generic example is shown in
The computing device 12 or 16 then disperse storage error encodes a data segment using the selected encoding function (e.g., Cauchy Reed-Solomon) to produce a set of encoded data slices.
Returning to the discussion of
As a result of encoding, the computing device 12 or 16 produces a plurality of sets of encoded data slices, which are provided with their respective slice names to the storage units for storage. As shown, the first set of encoded data slices includes EDS 1_1 through EDS 5_1 and the first set of slice names includes SN 1_1 through SN 5_1 and the last set of encoded data slices includes EDS 1_Y through EDS 5_Y and the last set of slice names includes SN 1_Y through SN 5_Y.
To recover a data segment from a decode threshold number of encoded data slices, the computing device uses a decoding function as shown in
Referring next to
The selection of slice data can be based on object size, as well as known performance and real time status of “real” DSN memory unit. The available throughput at the “pseudo” DS storage unit, along with the object size and real DSN memory unit performance and status would determine the desired latency needed to set data in motion. In some embodiments, the DS processing unit can use DSN network protocol with a “pseudo” DS storage unit address, hashed TCP port (based on real ds unit address or ID), desired latency and other attributes similar to those used in sending DSN slice data to “real” DS storage units. The DS processing unit sends slice data received from the “pseudo” DS storage units to the real DS storage units, while sending other slices directly to the real ds unit for the same object. The DS processing unit has to change only the destination address and TCP port for fast switching the slice data destination from “pseudo” DS storage units to “real” DS storage units.
In an example of operation of the optimizing of the performance of the set of storage units, for each storage unit of the set of storage units, the computing device 16 determines a storage unit status level. The storage unit status level includes one or more of a storage unit performance level, an available storage unit capacity level, a utilized storage capacity level, etc., the determining includes at least one of interpreting a query response, interpreting a test result, and receiving status information that includes the status level. For example, the Computing device 16 receives status information from the storage unit 2 indicating that the storage unit 2 is an underperforming storage unit.
When the storage unit status level compares unfavorably to a storage unit status threshold level, the computing device 16 sends a corresponding access request (e.g., access request 2) of a set of access requests (e.g., access requests 1-n) to access data utilizing the set of storage units, to the performance unit to facilitate execution of an alternative approach to processing the access request. The sending includes indicating that the alternative approach is to be utilized, obtaining the access request (e.g., access request 2) corresponding to the storage unit (e.g., storage unit 2), and sending, via the network 24, the access request to the performance unit, where the performance unit temporarily stores a received slice in the memory 88 when the access request is a write request, issues a forwarded access request (e.g., forwarded access request 2) to the corresponding storage unit (e.g., storage unit 2), where the request includes the received slice, and issues a proxy access response (e.g., proxy access response 2) to the computing device 16, where the response indicates that the slice has been stored. When the request is a read request, the computing device 16 attempts to retrieve a temporarily stored slice from the memory 88 of the performance unit and/or by the performance unit issuing a forwarded access request (e.g., another forwarded access request 2) to the corresponding storage unit (e.g., storage unit 2), receiving an access response from the corresponding storage unit that includes a retrieved slice, and issuing a proxy access response (e.g., proxy access 2) to the computing device 16, where the response includes retrieved slice from either of the performance unit or from the corresponding storage unit.
When the storage unit status level compares favorably to the storage unit status threshold level, then sends, via the network 24, the corresponding access request directly to the storage unit. For example, the computing device 16 sends, via the network 24, access requests 1, 3-n to the storage units 1, 3-n and receives, via the network 24, access responses 1, 3-n from the storage units 1, 3-n.
When the storage unit status level compares unfavorably to a storage unit status threshold level, the method continues at block 95, where the processing unit sends a corresponding access request of a set of access requests to a performance unit to facilitate execution of alternative approach to processing the access request, where the set of access requests is generated to access data utilizing the set of storage units. The sending includes one or more of indicating utilization of the alternative approach when the storage unit status level is less than the storage unit status threshold level, obtaining the access request corresponding to the storage unit, sending the access request to the performance unit where the performance unit Early stores a received slice in the memory when the access request is a write request, issues a forwarded access request to the corresponding storage unit, where the request includes the received slice, and issues a proxy access response to the processing unit, where the response indicates that the slice has been stored. When the request is a read request, the processing unit facilitates the performance unit to retrieve a temporarily stored slice from local memory of the performance unit and/or by sending a forwarded access request to the corresponding storage unit, receiving an access response from the storage unit that includes a retrieved slice, and issuing a proxy access response to the processing unit, where the response includes the retrieved slice (e.g., from either of the local memory or from the corresponding storage unit).
When the storage unit status level compares favorably to the storage unit status threshold level, the method continues at block 96, where the processing unit sends the corresponding access request of the set of access requests to the storage unit. For example, the processing unit sends the access request of the storage unit and receives an access response from the storage unit.
It is noted that terminologies as may be used herein such as bit stream, stream, signal sequence, etc. (or their equivalents) have been used interchangeably to describe digital information whose content corresponds to any of a number of desired types (e.g., data, video, speech, audio, etc. any of which may generally be referred to as ‘data’).
As may be used herein, the terms “substantially” and “approximately” provides an industry-accepted tolerance for its corresponding term and/or relativity between items. Such an industry-accepted tolerance ranges from less than one percent to fifty percent and corresponds to, but is not limited to, component values, integrated circuit process variations, temperature variations, rise and fall times, and/or thermal noise. Such relativity between items ranges from a difference of a few percent to magnitude differences. As may also be used herein, the term(s) “configured to”, “operably coupled to”, “coupled to”, and/or “coupling” includes direct coupling between items and/or indirect coupling between items via an intervening item (e.g., an item includes, but is not limited to, a component, an element, a circuit, and/or a module) where, for an example of indirect coupling, the intervening item does not modify the information of a signal but may adjust its current level, voltage level, and/or power level. As may further be used herein, inferred coupling (i.e., where one element is coupled to another element by inference) includes direct and indirect coupling between two items in the same manner as “coupled to”. As may even further be used herein, the term “configured to”, “operable to”, “coupled to”, or “operably coupled to ” indicates that an item includes one or more of power connections, input(s), output(s), etc., to perform, when activated, one or more its corresponding functions and may further include inferred coupling to one or more other items. As may still further be used herein, the term “associated with”, includes direct and/or indirect coupling of separate items and/or one item being embedded within another item.
As may be used herein, the term “compares favorably”, indicates that a comparison between two or more items, signals, etc., provides a desired relationship. For example, when the desired relationship is that signal 1 has a greater magnitude than signal 2, a favorable comparison may be achieved when the magnitude of signal 1 is greater than that of signal 2 or when the magnitude of signal 2 is less than that of signal 1. As may be used herein, the term “compares unfavorably”, indicates that a comparison between two or more items, signals, etc., fails to provide the desired relationship.
As may also be used herein, the terms “processing module”, “processing circuit”, “processor”, and/or “processing unit” may be a single processing device or a plurality of processing devices. Such a processing device may be a microprocessor, micro-controller, digital signal processor, microcomputer, central processing unit, field programmable gate array, programmable logic device, state machine, logic circuitry, analog circuitry, digital circuitry, and/or any device that manipulates signals (analog and/or digital) based on hard coding of the circuitry and/or operational instructions. The processing module, module, processing circuit, and/or processing unit may be, or further include, memory and/or an integrated memory element, which may be a single memory device, a plurality of memory devices, and/or embedded circuitry of another processing module, module, processing circuit, and/or processing unit. Such a memory device may be a read-only memory, random access memory, volatile memory, non- volatile memory, static memory, dynamic memory, flash memory, cache memory, and/or any device that stores digital information. Note that if the processing module, module, processing circuit, and/or processing unit includes more than one processing device, the processing devices may be centrally located (e.g., directly coupled together via a wired and/or wireless bus structure) or may be distributedly located (e.g., cloud computing via indirect coupling via a local area network and/or a wide area network). Further note that if the processing module, module, processing circuit, and/or processing unit implements one or more of its functions via a state machine, analog circuitry, digital circuitry, and/or logic circuitry, the memory and/or memory element storing the corresponding operational instructions may be embedded within, or external to, the circuitry comprising the state machine, analog circuitry, digital circuitry, and/or logic circuitry. Still further note that, the memory element may store, and the processing module, module, processing circuit, and/or processing unit executes, hard coded and/or operational instructions corresponding to at least some of the steps and/or functions illustrated in one or more of the Figures. Such a memory device or memory element can be included in an article of manufacture.
One or more embodiments have been described above with the aid of method steps illustrating the performance of specified functions and relationships thereof. The boundaries and sequence of these functional building blocks and method steps have been arbitrarily defined herein for convenience of description. Alternate boundaries and sequences can be defined so long as the specified functions and relationships are appropriately performed. Any such alternate boundaries or sequences are thus within the scope and spirit of the claims. Further, the boundaries of these functional building blocks have been arbitrarily defined for convenience of description. Alternate boundaries could be defined as long as the certain significant functions are appropriately performed. Similarly, flow diagram blocks may also have been arbitrarily defined herein to illustrate certain significant functionality.
To the extent used, the flow diagram block boundaries and sequence could have been defined otherwise and still perform the certain significant functionality. Such alternate definitions of both functional building blocks and flow diagram blocks and sequences are thus within the scope and spirit of the claims. One of average skill in the art will also recognize that the functional building blocks, and other illustrative blocks, modules and components herein, can be implemented as illustrated or by discrete components, application specific integrated circuits, processors executing appropriate software and the like or any combination thereof.
In addition, a flow diagram may include a “start” and/or “continue” indication. The “start” and “continue” indications reflect that the steps presented can optionally be incorporated in or otherwise used in conjunction with other routines. In this context, “start” indicates the beginning of the first step presented and may be preceded by other activities not specifically shown. Further, the “continue” indication reflects that the steps presented may be performed multiple times and/or may be succeeded by other activities not specifically shown. Further, while a flow diagram indicates a particular ordering of steps, other orderings are likewise possible provided that the principles of causality are maintained.
The one or more embodiments are used herein to illustrate one or more aspects, one or more features, one or more concepts, and/or one or more examples. A physical embodiment of an apparatus, an article of manufacture, a machine, and/or of a process may include one or more of the aspects, features, concepts, examples, etc. described with reference to one or more of the embodiments discussed herein. Further, from figure to figure, the embodiments may incorporate the same or similarly named functions, steps, modules, etc. that may use the same or different reference numbers and, as such, the functions, steps, modules, etc. may be the same or similar functions, steps, modules, etc. or different ones.
Unless specifically stated to the contra, signals to, from, and/or between elements in a figure of any of the figures presented herein may be analog or digital, continuous time or discrete time, and single-ended or differential. For instance, if a signal path is shown as a single-ended path, it also represents a differential signal path. Similarly, if a signal path is shown as a differential path, it also represents a single-ended signal path. While one or more particular architectures are described herein, other architectures can likewise be implemented that use one or more data buses not expressly shown, direct connectivity between elements, and/or indirect coupling between other elements as recognized by one of average skill in the art.
The term “module” is used in the description of one or more of the embodiments. A module implements one or more functions via a device such as a processor or other processing device or other hardware that may include or operate in association with a memory that stores operational instructions. A module may operate independently and/or in conjunction with software and/or firmware. As also used herein, a module may contain one or more sub-modules, each of which may be one or more modules.
As may further be used herein, a computer readable memory includes one or more memory elements. A memory element may be a separate memory device, multiple memory devices, or a set of memory locations within a memory device. Such a memory device may be a read-only memory, random access memory, volatile memory, non-volatile memory, static memory, dynamic memory, flash memory, cache memory, and/or any device that stores digital information. The memory device may be in a form a solid state memory, a hard drive memory, cloud memory, thumb drive, server memory, computing device memory, and/or other physical medium for storing digital information.
While particular combinations of various functions and features of the one or more embodiments have been expressly described herein, other combinations of these features and functions are likewise possible. The present disclosure is not limited by the particular examples disclosed herein and expressly incorporates these other combinations.
Claims
1. A method for use in a distributed storage network (DSN) including a plurality of storage units and a distributed storage (DS) processing unit, the method comprising:
- determining, by the DS processing unit, that: at least a first storage unit of the one or more of the plurality of storage units is associated with a status level that fails to satisfy a threshold value associated with a first access request of a set of access requests;
- at least a second storage unit of the one or more of the plurality of storage units is associated with a status level that satisfies the threshold value associated with a second access request of the set of access requests;
- transmitting the first access request from the DS processing unit to a performance unit, the performance unit including a processor and a local memory configured to facilitate execution of alternative processing of the first access request; and
- transmitting the second access request from the DS processing unit to the at least a second storage unit for standard processing of the second access request.
2. The method of claim 1, further comprising:
- performing the alternative processing of the first access request by the performance unit, wherein the alternative processing includes temporarily storing a received data slice associated with the first access request in the local memory of the performance unit when the first access request is a write request.
3. The method of claim 2, wherein the alternative processing includes issuing a forwarded access request to the at least a first storage unit, wherein the forwarded access request includes the received data slice temporarily stored in the local memory.
4. The method of claim 2, wherein the alternative processing includes:
- issuing a composite access response from the performance unit to the DS processing unit, the composite access response including information associated with the at least a first storage unit and the at least a second storage unit.
5. The method of claim 1, wherein the alternative approach includes:
- performing the alternative processing of the first access request by the performance unit, wherein the alternative processing includes retrieving a temporarily stored data slice from the local memory of the performance unit when the first access request is a read request.
6. The method of claim 5, further comprising:
- sending a forwarded first access request from the performance unit to the at least a first storage unit; and
- receiving, at the performance unit, an access response from the at least a first storage unit, wherein the access response includes a data slice to be stored in the local memory of the performance unit as the temporarily stored data slice.
7. The method of claim 5, further comprising:
- issuing, from the performance unit, a proxy access response to the DS processing unit, wherein the proxy access response includes the temporarily stored data slice.
8. A non-transitory computer readable medium tangibly embodying a program of computer executable instructions, the program of computer executable instructions including:
- at least one instruction to determine, by a distributed storage (DS) processing unit included in a distributed storage network (DSN), that: at least a first storage unit of a plurality of storage units included in the DSN is associated with a status level that fails to satisfy a performance threshold value associated with a first access request; at least a second storage unit of the plurality of storage units is associated with a status level that satisfies the performance threshold value associated with a second access request;
- at least one instruction to transmit the first access request from the DS processing unit to a performance unit included in the DSN, the performance unit including a processor and a local memory, and configured to facilitate execution of alternative processing of the first access request; and
- at least one instruction to transmit the second access request from the DS processing unit to the at least a second storage unit for standard processing of the second access request.
9. The non-transitory computer readable medium of claim 8, wherein, when the first access request is a write request, the first access request includes a data slice to be temporarily stored by the performance unit in the local memory.
10. The non-transitory computer readable medium of claim 8, wherein the program of computer executable instructions includes:
- at least one instruction to receive a proxy write response from the performance unit, the proxy write response including information associated with the at least a first storage unit.
11. The non-transitory computer readable medium of claim 8, wherein, when the first access request is a read request, the first access request causes the performance unit to retrieve a data slice from the at least a first storage unit.
12. The non-transitory computer readable medium of claim 8, wherein, when the first access request is a read request, the first access request causes the performance unit to retrieve a temporarily stored data slice from the local memory of the performance unit.
13. The non-transitory computer readable medium of claim 12, further comprising:
- at least one instruction to receive a proxy read response from the performance unit, the proxy read response including, the temporarily stored data slice.
14. The non-transitory computer readable medium of claim 8, further comprising:
- at least one instruction to transmit read and write access requests exclusively to the performance unit for each of a plurality of underperforming storage units.
15. A distributed storage network (DSN) comprising:
- a plurality of storage units;
- a distributed storage (DS) processing unit coupled to the plurality of storage units, the DS processing unit configured to: transmit standard access requests from the DS processing unit to first storage units of the plurality of storage units, wherein the first storage units are associated with status levels satisfying a threshold performance value; transmit alternative access requests from the DS processing unit to a proxy for second storage units, wherein the second storage units are associated with status levels failing to satisfy the threshold performance value;
- a performance unit coupled to the plurality of storage units and to the DS processing unit, the performance unit configured to act as a proxy between the DS processing unit and second storage units of the plurality of storage units; and
- the DS processing unit further configured to transmit alternative access requests from the DS processing unit to the performance unit, the performance unit including a processor and a local memory configured to facilitate execution of alternative processing of the alternative access requests.
16. The DSN of claim 15, wherein the DS processing unit is further configured to:
- determine which of the plurality of storage units are first storage units and which of the plurality of storage units are second storage units.
17. The DSN of claim 16, wherein the DS processing unit is further configured to:
- transmit read and write access requests intended for the second storage units to the performance unit.
18. The DSN of claim 15, wherein the performance unit is further configured to:
- temporarily store a received data slice associated with the alternative access request in a local memory of the performance unit when the alternative access request is a write request;
- issue forwarded access requests to the second storage units, wherein the forwarded access requests includes the received data slice temporarily stored in the local memory; and
- issue a proxy access response regarding the second storage units to the DS processing unit.
19. The DSN of claim 15, wherein the performance unit is further configured to:
- retrieve a temporarily stored data slice from the local memory of the performance unit when an alternative access request is a read request; and
- issue a proxy access response to the DS processing unit, wherein the proxy access response includes the temporarily stored data slice.
20. The DSN of claim 15, wherein the performance unit is further configured to:
- obtain a data slice from at least one of the second storage units when an alternative access request is a read request.
Type: Application
Filed: Nov 1, 2016
Publication Date: Jun 1, 2017
Inventor: Harsha Hegde (Hawthorn Woods, IL)
Application Number: 15/340,628