Hitachi AMS2100 User Manual page 37

reconfiguration of the management information storage area for
SnapShot. In other patterns, the I/O performance deteriorates
less than 10%.
• Time-out for memory reconfiguration processing
If the I/O inflow is large, data saving to the drives of the cache
data takes time and may time out in a internal processing time of
60 minutes. In this case, the processing can be continued by
executing it again when the I/O inflow is small.
• Inhibiting the memory reconfiguration processing performance
while executing other functions
In the following items, the memory reconfiguration processing is
inhibited to increase the data amount to the cache. Perform the
memory reconfiguration processing again after completing the
operation of other functions or recovering the failure.
Other than master cache partition (partition 0 and partition 1) in
use
- Cache partition in changing
- DP pool in optimization
- RAID group in growing
- LU ownership in changing
- Cache Residency LU in operation
- Remote path and/or pair of TrueCopy or TCE in operation
- SnapShot Logical Units or Data Pools in operation
- DMLU in operation
- Logical Unit in formatting
- Logical Unit in parity correction
- IP address for maintenance or management in operation
- SSL information in operation
- Array firmware in updating
- Power OFF of array in operation
- Spin-down or spin-up by Power Saving feature in operation
• Inhibiting the operation of other functions during memory
reconfiguration
- When the memory reconfiguration processing fails on the
way due to the factors other then the time-out
- RAID group grown operation
- Replication Pair operation
- Dynamic Provisioning operation
- Cache Residency Manager setting operation
- Logical Unit formatting operation
SnapShot overview
Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide
1-17