Abstract: A method for managing a data storage system, consisting of configuring a first cache to retrieve data from and store data at a first range of logical addresses (LAs) in a storage device. A second cache is configured to operate like the first cache. The method further includes configuring one or more third caches to retrieve data from and store data at a second range of LAs in the storage device. The method includes detecting an inability of the second cache to retrieve data from or store data at the first range of LAs. In response to the inability, at least one of the first cache and the one or more third caches are reconfigured to retrieve data from and store at the first range of LAs while continuing to retrieve data from and store at the second range of LAs.

Abstract: A storage system, including: one or more mass storage devices, coupled to store data at respective first ranges of logical addresses (LAs), and one or more interfaces, which are adapted to receive input/output (IO) requests from host processors directed to specified LAs. The system also includes a plurality of caches coupled to the one or more interfaces so as to receive the IO requests therefrom, each cache being assigned a respective second range of the LAs and being coupled to the one or more mass storage devices, the respective first ranges of which overlap the respective second range, so as to receive data from and provide data to the one or more mass storage devices, and being coupled to accept the IO requests within the respective second range directed thereto.

Abstract: A method for managing activity of a data storage system, including at least partly managing and performing an operator interaction with the storage system using a first processing system, and monitoring operation of the first processing system using a second processing system. The method further includes detecting a failure in operation of the first processing system using the second processing system and at least partly managing and performing the operator interaction using the second processing system in response to detecting the failure.

Abstract: A system for transferring data to and from one or more slow-access-time-mass-storage nodes which store data at respective first ranges of logical block addresses (LBAs), including a plurality of interim-fast-access-time nodes which are configured to operate independently of one another. Each interim-fast-access-time node is assigned a respective second range of the LBAs and is coupled to receive data from and provide data to the one or more slow-access-time-mass-storage nodes within the respective second range. The system further includes one or more interface nodes, which are adapted to receive input/output (IO) requests from host processors directed to specified LBAs and to direct all the IO requests to the interim-fast-access-time node to which the specified LBAs are assigned.

Abstract: A method for data distribution, including distributing logical addresses among an initial set of devices so as provide balanced access, and transferring the data to the devices in accordance with the logical addresses. If a device is added to the initial set, forming an extended set, the logical addresses are redistributed among the extended set so as to cause some logical addresses to be transferred from the devices in the initial set to the additional device. There is substantially no transfer of the logical addresses among the initial set. If a surplus device is removed from the initial set, forming a depleted set, the logical addresses of the surplus device are redistributed among the depleted set. There is substantially no transfer of the logical addresses among the depleted set. In both cases the balanced access is maintained.