To Reconfigure Raid; Monitoring Raid Status; Data Reads And Writes And Raid Status; Data Redundancy And Raid Status - HP StorageWorks P4000 User Manual

• Changing preconfigured RAID on a new storage system
RAID must be configured on individual storage systems before they are added to a management
group. To change the preconfigured RAID level of a storage system, make the change before you
add the storage system to a management group.
• Changing RAID on storage systems in management groups
You cannot reconfigure RAID on a storage system that is already in a management group. To
change the RAID configuration for a storage system that is in a management group, you must first
remove it from the management group.
CAUTION:
Changing the RAID configuration will erase all the data on the disks.

To reconfigure RAID

1. In the navigation window, log in to the storage system and select the Storage category.
2. On the RAID Setup tab, click RAID Setup Tasks and select Reconfigure RAID.
3. Select the RAID configuration from the list.
4. Click OK.
5. Click OK on the message that opens.
RAID starts configuring.
NOTE:
A storage system may take several hours for the disks to synchronize in a RAID 10, RAID 5, RAID
50, or RAID 6 configuration. During this time, performance will be degraded. When the RAID status
on the RAID Setup tab shows Normal, the disks provide fully operational data redundancy, and
performance returns to normal.

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, RAID 5 or RAID 50 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.
60 Storage Configuration: Disk RAID and Disk Management
"Alarms and events overview" on page 121.