Administrator Guide

The higher the priority level, the larger is the impact on host I/O and system performance.
Changing the RAID controller module ownership of
a disk pool
You can change the RAID controller module ownership of a disk pool to specify which RAID controller module must own all of the virtual
disks in the disk pool.
Changing the RAID controller module ownership at the disk pool level causes each virtual disk in that disk pool to transfer to the other
RAID controller module and use a new I/O path. If you do not want to set each virtual disk to the new path, change the RAID controller
module ownership at the virtual disk level instead of the disk pool level.
CAUTION: Possible loss of data access – If you change the RAID controller module ownership while an application is
accessing the virtual disks in the disk pool, it may result in I/O errors. Make sure that the application is not accessing
the virtual disks, and there is a multi-path driver installed on the hosts before you perform this procedure.
To RAID controller module ownership of a disk pool:
1. In AMW, select the Storage & Copy Services tab.
2. Select the disk pool.
3. From the menu bar, select Storage > Disk Pool > Change > Ownership/Preferred Path.
4. Select the RAID controller module.
5. Click Yes.
Checking data consistency
Use the Check Consistency option to check the consistency on a selected disk pool or disk group.
Use this option only when instructed by the Recovery Guru.
CAUTION: Use this option only under the guidance of your Technical Support representative.
Keep these important guidelines in mind before you check data consistency:
• Disk pools are configured only as RAID Level 6.
• You cannot use this option on RAID Level 0 disk groups that have no consistency.
• If you use this option on a RAID Level 1 disk group, the consistency check compares the data on the replicated physical disks.
• If you perform this operation on a RAID Level 5 or RAID Level 6 disk group, the check inspects the consistency information that is
striped across the physical disks. The information about RAID Level 6 applies also to disk pools.
• To successfully perform this operation, these conditions must be present:
○ The virtual disks in the disk pool or disk group must be in Optimal status.
○ The disk pool or disk group must have no virtual disk modification operations in progress.
○ You can perform this operation only on one disk pool or disk group at a time. However, you can perform a consistency check on
selected virtual disks during a media scan operation. You can enable a media scan consistency check on one or more virtual disks in
the storage array.
To check data consistency:
1. Select the Storage & Copy Services tab.
2. Select the disk pool or disk group that you want to check.
3. Select one of the following from the menu bar:
• Storage > Disk Group > Advanced > Check Consistency
• Storage > Disk Pool > Advanced > Check Consistency
4. Click Yes.
5. Click Start.
The check consistency operation starts and the Check Consistency dialog is displayed. The virtual disks in the disk pool or disk group
are sequentially scanned, starting from the top of the table in the virtual disk dialog. The following actions occur as each virtual disk is
scanned:
• The virtual disk is selected in the virtual disk table.
CAUTION:
Possible loss of data access – A consistency error is potentially serious and could cause a permanent
loss of data.
90 Disk pools and disk pool virtual disks