RAID group

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The definition of a RAID group is as follows: A single physical disk cannot meet requirements of a large amount of data storage and data security. A RAID group serves as a large logical disk that comprises independent physical disks of the different RAID levels, providing larger storage space.
Different RAID levels meet data security requirements in different application scenarios.

Other related questions:
What is the impact for the VCN3000 to reconstruct the RAID group?
Reconstructing the RAID group will result in recording data loss. Please exercise caution when performing this operation. Cameras that have been added do not need to be added again.

Solution when a RAID group is abnormal
Check the event information on ISM and determine the reason why the RAID group is degraded due to disk failures. Bit error isolation Note: Check whether there are events indicating excessive bit errors related to the disk. If yes, the disk may be isolated due to excessive bit errors. Troubleshooting: Analyze the SES log and determine why there are excessive bit errors. Disk fault Note: The disk fault cannot be rectified. As a result, accessing the disk fails and disk rejection occurs. Troubleshooting: Replace the faulty disk. Disk enclosures are offline. Note: If a RAID group consists of disks from different enclosures and disk enclosures are offline, the RAID group will be degraded or fail. Recommended action: Check whether the disk enclosures are offline.

Possible causes of RAID group exceptions
RAID group exceptions include RAID group degrade and RAID group failure. The root cause of the RAID group exceptions are disk failures. The possible causes are as follows: bit error isolation, disk faults, and enclosure offline (a RAID group consisting of disks from different enclosures). When the RAID group is degraded, if the system has idle or hot spare disks, the system automatically starts reconstruction and reconstructs the data in the faulty disk to the hot spare disk. Performance may be deteriorated during the reconstruction. If the disk is reconstructed, reduce the service pressure of the reconstructed RAID group if possible, so that the reconstruction can be completed as soon as possible.

Method used to plan reliability of the RAID group
You can plan the RAID group as follows: After a RAID group is created in the storage system, data is stored in the member disks of the RAID group. The mirroring and parity check functions of a RAID group provide reliable data recovery mechanisms if the member disks in a RAID group fail.

Maximum number of RAID groups supported by a server
The maximum number of RAID groups supported by a server is determined by the RAID controller card model. The maximum number of RAID groups supported by each type of RAID controller cards is as follows: LSISAS2208: 64 LSISAS2308: 2 LSISAS3008: 2 LSISAS3108: 64 LSISoftRAID: 6

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