How can I do when the RAID group item cannot be viewed on VCN500?

If the number of RAID member disks is N (excluding hot spare disks), available capacity of RAID 0 = N x disk capacity. Available capacity of RAID 1 = N x Disk capacity/Number of mirror groups Available capacity of RAID 3 = (N-1) x Disk capacity Available capacity of RAID 5 = (N-1) x Disk capacity Available capacity of RAID 6 = (N-2) x Disk capacity Available capacity of RAID 10 = N x Disk capacity/Number of mirror groups Available capacity of RAID 50 = (N-2) x Disk capacity

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.

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.

You can plan the RAID group performance as follows: Different RAID levels of vary in the following items: 1. Read and write performance. 2. Disk utilization. 3. Application scenarios. When selecting a RAID level for specific applications, consider performance, data amount to be stored, and disk utilization. The following conclusions can help in selecting RAID levels: a. If you do not consider the redundant data, RAID 0 has the best read and write performance. b. If you require data redundancy and good system performance regardless of disk costs, RAID 1 or RAID 10 can be optimal choices. c. If you require redundant data, good system performance, and cost-effective disks, RAID 3, RAID 5, RAID 6, and RAID 50 can be optimal choices.

To enter the roster-item view on the SC, perform the following operations: 1. Run the system-view command to enter the system view. 2. Run the roster-item command to enter the roster-item view.