Abstract: A method for processing snapshots and a distributed block storage system, the method including: acquiring the number of read operations and the number of read/write operations for a data block in a distributed block storage system; on the basis of the number of read operations and the number of read/write operations, determining a target snapshot manner, wherein the target snapshot manner includes copying while writing or re-orienting while writing; on the basis of the target snapshot manner, performing a snapshot operation on the data block in the distributed block storage system.

Abstract: Disclosed in the present disclosure is a data caching method and apparatus, the data caching method includes the following steps: receiving a data request message sent by a user terminal; if detecting that a cache apparatus does not include the target access data requested by the data request message, then sending the target access data in a storage apparatus to the user terminal; extracting parameter information of the target access data in the storage apparatus, and determining whether the parameter information matches a preset parameter condition; and, if the parameter information matches the preset parameter condition, then transmitting the target access data to the cache apparatus.

Abstract: Disclosed is a composite LED module comprising a 230±10 nm deep-ultraviolet light LED, a 275±10 nm deep-ultraviolet light LED, and 0 to 3 visible light LED(s), packed in a same substrate. Also disclosed are a water quality monitoring device and a water quality monitoring probe containing the composite LED module.

Abstract: Disclosed in the present disclosure is a data caching method and apparatus, the data caching method includes the following steps: receiving a data request message sent by a user terminal; if detecting that a cache apparatus does not include the target access data requested by the data request message, then sending the target access data in a storage apparatus to the user terminal; extracting parameter information of the target access data in the storage apparatus, and determining whether the parameter information matches a preset parameter condition; and, if the parameter information matches the preset parameter condition, then transmitting the target access data to the cache apparatus.

Abstract: A method for processing snapshots and a distributed block storage system, the method including: acquiring the number of read operations and the number of read/write operations for a data block in a distributed block storage system (S301); on the basis of the number of read operations and the number of read/write operations, determining a target snapshot manner, wherein the target snapshot manner includes copying while writing or re-orienting while writing (S302); on the basis of the target snapshot manner, performing a snapshot operation on the data block in the distributed block storage system

Abstract: The data storage system is a RAID-based data storage system in which resources are globally shared. This storage system includes the first number of disks, and the RAID mechanism is used to store data on each disk. The blocks on different disks form stripes, and at least one of the blocks on the stripe stores the parity information, wherein the width of the stripe is less than the first number. The data layout of the data storage system satisfies the following characteristics: any two physical blocks in the stripe are distributed on different disks; the data blocks distributed on each disk are the same, and the distributed parity blocks are also the same; other data in the stripe associated with any piece of disk data is evenly distributed across all the remaining disks. Normal data layout and degraded data layout can be implemented by orthogonal Latin squares.

Abstract: The data storage system is a RAID-based data storage system in which resources are globally shared. This storage system includes the first number of disks, and the RAID mechanism is used to store data on each disk. The blocks on different disks form stripes, and at least one of the blocks on the stripe stores the parity information, wherein the width of the stripe is less than the first number. The data layout of the data storage system satisfies the following characteristics: any two physical blocks in the stripe are distributed on different disks; the data blocks distributed on each disk are the same, and the distributed parity blocks are also the same; other data in the stripe associated with any piece of disk data is evenly distributed across all the remaining disks. Normal data layout and degraded data layout can be implemented by orthogonal Latin squares.

Abstract: Disclosed is a composite LED module comprising a 230±10 nm deep-ultraviolet light LED, a 275±10 nm deep-ultraviolet light LED, and 0 to 3 visible light LED(s), packed in a same substrate. Also disclosed are a water quality monitoring device and a water quality monitoring probe containing the composite LED module.

Abstract: The data storage system and the data storage approach based on redundant arrays of independent disks (RAID) is provided. The storage system includes: an RAID controller, and a storage device subsystem. This storage device subsystem includes a plurality of first physical storage devices for data storage and a plurality of second physical storage devices for parity storage. First physical storage devices are divided into a plurality of sets of first disks which are independent from each other. The data accesses to different sets of first disks will not interfere with each other. These second disks are shared by all the sets of first disks. The RAID controller stores data in each set of first disks and stores parity information in multiple shared second disks by the RAID mechanism. The storage system combines the parity from different RAID volumes into one shared set and this improves the performance and reliability of the whole storage system.

Abstract: The data storage system and the data storage approach based on redundant arrays of independent disks (RAID) is provided. The storage system includes: an RAID controller, and a storage device subsystem. This storage device subsystem includes a plurality of first physical storage devices for data storage and a plurality of second physical storage devices for parity storage. First physical storage devices are divided into a plurality of sets of first disks which are independent from each other. The data accesses to different sets of first disks will not interfere with each other. These second disks are shared by all the sets of first disks. The RAID controller stores data in each set of first disks and stores parity information in multiple shared second disks by the RAID mechanism. The storage system combines the parity from different RAID volumes into one shared set and this improves the performance and reliability of the whole storage system.