Disk array states
A disk array can be in one of seven states.
The seven valid states for disk arrays are described in the following table:
| State | Description |
|---|---|
| Active | The disk array is functional and fully protected (RAID level 5, 6, 10, 5T2, 6T2, and 10T2) with all physical disks in the Active state. |
| Degraded | The disk array's protection against disk failures
is degraded or its performance is degraded. When one or more physical disks in the disk array are in the Failed state, the array is still functional but might no longer be fully protected against disk failures. The Degraded state indicates the protection against disk failures is less than optimal. When all physical disks in the disk array are in the Active state, the array is not performing optimally because of a problem with the I/O adapter's nonvolatile write cache. The Degraded state indicates the performance is less than optimal. |
| Rebuilding | Data protection is being rebuilt on this disk array. |
| R/W Protected | The disk array cannot process a read nor write operation. A disk array may be in this state because of a cache, device configuration, or any other problem that could cause a data integrity exposure. |
| Missing | The disk array was not detected by the host operating system. |
| Offline | The disk array has been placed offline due to unrecoverable errors. |
| Failed | The disk array is no longer accessible because of disk failures or configuration problems. |
