Hitachi AMS2100 User Manual page 135

Pair Status
Simplex Status when the volume has not been paired or
when the pair has been deleted. The volume has no
SnapShot association with another volume.
Paired The data of the P-VOL and the V-VOL is in the same
status. However, since Read to the V-VOL in the
Paired status and the Write access cannot be
performed, it is actually the same as Simplex.
Synchronizing Initial or update copy is in progress.
Reverse P-VOL restoration from V-VOL is in progress. Status
Synchronizing returns to Paired when restoration is completed.
When a failure occurs, or the pair is split during
restoration, V-VOL status is correlated with the P-
VOL status. Any status other than Simplex being
restored becomes Failure
Split The snapshot is executed and P-VOL data is updated
in the V-VOL. In this state, access from a host to a
P-VOL is lowered.
Threshold Threshold value for the data pool is exceeded;
Over warning status.
Failure Copying is suspended due to a hardware failure or
data pool overflow. All V-VOLs become invalid.
Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide
•
Table 7-1: Pair Statuses
Description
Monitoring and maintenance
P-VOL V-VOL
Read/Write. No Read/Write
Read/Write. No Read/Write
Read/Write. No Read/Write
Read/Write. No Read/Write
Read/Write. Read/Write. (Read/
write not accepted
during P-VOL
restore.)
P-VOL is being
restored.)
Read/Write. Read/Write. (Read/
write not accepted
during P-VOL
restore.)
7-3