Monitoring Raid Status; Data Reads And Writes And Raid Status; Data Redundancy And Raid Status - HP StoreVirtual 4000 User Manual

Monitoring RAID status

RAID is critical to the operation of the storage system. If RAID has not been configured, the storage
system cannot be used. Monitor the RAID status of a storage system to ensure that it remains normal.
If the RAID status changes, a CMC event is generated. For more information about events and
event notification, see

Data reads and writes and RAID status

A RAID status of Normal, Rebuild, or Degraded all allow data reads and writes. The only time
data cannot be written to and read from the storage system is if the RAID status shows Off.

Data redundancy and RAID status

In a RAID 1, RAID 10, or RAID 5 configuration, when RAID is degraded, there is no full data
redundancy. Therefore, data is at additional risk if there is a disk failure when RAID is degraded.
In RAID 6, when RAID is degraded due to a single drive failure, the data is still not at risk for a
second failure. However, if it is degraded due to the failure of two drives, then data would be at
risk if another drive failed.
CAUTION:
results in data loss. In a degraded RAID 5 configuration, loss of a second disk results in data loss.
In a degraded RAID 6 configuration, the loss of three drives results in data loss.
The RAID status is located at the top of the RAID Setup tab in Storage. RAID status also appears
in the Details tab on the main CMC window when a storage system is selected in the navigation
window.
Figure 9 Monitoring RAID status on the main CMC window
1. RAID status
The status displays one of five RAID states.
Normal—RAID is synchronized and running. No action is required.
Rebuilding—A new disk has been inserted in a drive bay, or a hot spare has been activated,
and RAID is currently rebuilding. No action is required.
Degraded—RAID is degraded. A disk may have failed or have been removed from its bay.
For hot-swap storage systems, simply replace the faulty, inactive, uninitialized, or missing disk.
Off—Data cannot be stored on the storage system. The storage system is offline and flashes
in the navigation window.
None—RAID is unconfigured.
34 Configuring RAID and Managing Disks
"Alarms and events overview" (page
In a degraded RAID 1 or RAID 10 configuration, loss of a second disk within a pair
84).