Hitachi AMS 2000 Series, Reference Manual

Page: 153 / 262

Troubleshooting
2–31
Hitachi AMS 2000 Family Command Control Interface (CCI) Reference Guide
Data recovery for PSUE using ShadowImage
When a pair was suspended (PSUE) due to a failure in the array, collect the
CCI system log files and call the Hitachi maintenance personnel (see Pair-
splitting guidelines, on page 2-32 ).
Maintenance personnel will remove the source of error in the array. After
the source of the error has been removed, the system administrator must
recover the pair using the CCI commands.
Recovering the pair
Make sure that the system administrator has verified that the PSUE
occurred while resynchronizing from S-VOL to P-VOL (pairresync –restore).
Table 2-11 shows data assurance and the method for recovering the pair.
•
Table 2-11: Data Assurance and Recovery Methods
State before
PSUE
Data Assurance Action to be taken after PSUE
Other than RCPY P-VOL: Assured 
S-VOL: Not
assured
Resynchronize (pairresync) in the direction of P-VOL
to S-VOL. 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).
RCPY P-VOL: Not
assured

S-VOL: Not
assured
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.