Data Recovery For Psue Using Snapshot; Recovering The Pair - Hitachi AMS 2000 Reference Manual

After splitting the pair and when the drive maintenance is done by the
maintenance personnel, restore the backup data, make the host recognize
the LU, and create the pair. And then turn the protection function ON and
start HORCM.

Data recovery for PSUE using SnapShot

When a pair was suspended (PSUE) due to a failure in the array, collect the
CCI system log files and then call the Hitachi maintenance personnel The
maintenance personnel will remove the error cause of the array. After the
error cause has been removed, the system administrator must recover the
pair using the CCI commands.

Recovering the pair

The concrete pair recovery using SnapShot is that pair is split (with pairsplit
-S) once and then create again (with paircreate). Recover the pair following
the detailed recovery procedure shown in
Make sure that the system administrator has verified that the PSUE
occurred while restoring from V-VOL to P-VOL (pairresync –restore).
Table 2-12
•
State before
PSUE
Other than
COPY(RS-R)
COPY(RS-R)
Hitachi AMS 2000 Family Command Control Interface (CCI) Reference Guide
shows data assurance and the method for recovering the pair.
Table 2-12: Data Assurance and Recovery Methods
Data
Assurance
P-VOL: Assured
V-VOL: Not
assured
P-VOL: Not
assured
V-VOL: Not
assured
Troubleshooting
Figure 2-2 on page
Action to be taken after PSUE
Split the pair (pairsplit -S), and then create a pair
(paircreate) again. Note that the pair may have
been split due to the drive's double-malfunction in
either or both volumes. In such case, confirm that
the data exists in the P-VOL, and then create a
pair (paircreate). Incidentally, the V-VOL data
generated is not the one invalidated previously
but the P-VOL data at the time when the pair was
newly formed.
Split the pair (pairsplit -S), restore the backup
data to P-VOL, and then create a pair (paircreate).
Note that the pair may have been split due to the
drive's double-malfunction in either or both
volumes. In such case, confirm that the backup
data restoration has been completed to the 
P-VOL, and then create a pair. Incidentally, the V-
VOL data generated is not the one invalidated
previously but the P-VOL data at the time when
the pair was newly formed.
2-5.
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