Recovering From Pair Failure Due To A Hardware Failure; Data Pool Capacity Exceeded - Hitachi AMS2100 User Manual

Recovering from pair failure due to a hardware failure

Data pool capacity exceeded

Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide
You can recover from a pair failure that is due to a hardware failure.
Prerequisite
1. Review the information log to see what the hardware failure is.
2. Restore the Storage system. See Navigator 2 program Help for
details.
To recover the SnapShot system after a hardware failure
1. When the systems is restored, delete the pair. See
V-VOLs, data pools, DMLU on page 6-10
2. Re-create the pair. See
procedure on page
When your data pool's capacity exceeds its threshold value, the size
of the data pool must be increased. Most likely, the POOL FULL
condition has caused pair failures as well. For more information on
the data pool, see Data pools on page
Prerequisites
• When releasing a pair, back up the V-VOL data to a tape device,
if necessary, before releasing the pair because the data of the V-
VOL of the pair to be released becomes invalid.
• LUs for a data pool must be on the same controller as the P-VOL
LUs.
• Up to 64 LUs can be assigned to a data pool.
• Hitachi recommends a minimum of 20 GB for data pool size.
• To review the data pool sizing procedure, see
pool size on page
• When Cache Partition Manager is used with SnapShot, the
segment size of the LU belonging to a data pool must be the
default size (16 kB) or less. See Hitachi Storage Navigator Modular 2
Storage Features Reference Guide for more information.
• An LU with SAS drives, an LU with SAS7.2K drives, an LU with
SSD drives, and an LU with SATA drives cannot coexist in a data
pool.
To expand the data pool capacity
To expand the data pool capacity, add one or more LUs to the data
pool. However, be careful when 64 LUs have already been set for the
data pool whose capacity is to be expanded or the number of LUs set
for the data pools of the whole disk array has already reached 128,
because no LU can be added to the data pool.
Troubleshooting
Creating a pair using the Create Pair
6-3.
1-4.
2-5.
Deleting pairs,
for more information.
Establishing data
8-3