Pair Failure; Recovering From Pair Failure Due To Pool Full - Hitachi AMS2100 User Manual

Pair failure

Recovering from pair failure due to POOL FULL

8-2
Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide
You can monitor the status of a data pool whose associated pairs'
status is changed to Failure. Pair failure is caused by one of the
following reasons:
• A hardware failure occurred that affects pair or data pool
volumes
• A data pool's capacity was exceeded.
To determine the cause of pair failure
1. Check the status of the data pool whose associated pairs' status
is changed to Failure. See
4 for instructions.
a. If the status of the data pool is POOL FULL, the pair failure is
due to exceeded data pool capacity.
b. If the status of the data pool is other than POOL FULL, the pair
failure is due to hardware failure.
The procedure for restoring the pair differs according to the cause.
You can recover from a pair failure that is due to a data pool's
capacity that was exceeded.
Prerequisite
Review SnapShot system configuration. See
design for detailed information on the following:
• Measuring write workload and sizing of the data pool. This
addresses the amount of data that accumulates in the data pool
and provides calculations for determining the correct size of the
data pool.
• Assessing business requirements to establish the lifespan and
number of V-VOLs
To recover pairs when status is POOL FULL
1. Delete all the pairs that are using the full data pool.
2. Do one or more of the following:
- Increase the size of the data pool. See
capacity on page
- Reduce the number of V-VOLs.
- Reduce the lifespan of V-VOLs.s
3. Re-create the pairs. See
procedure on page
Troubleshooting
Monitoring data pool usage on page 7-
7-4.
Creating a pair using the Create Pair
6-3.
Chapter 2, Planning and
Expanding data pool