1–20
Performing CCI Operations
Hitachi AMS 2000 Family Command Control Interface (CCI) Reference Guide
• Online backup of the Windows 2000 and Windows Server file system:
- Issue
the
x-sync command to a mounted primary volume to flush
the file system
buffer, then split the volume pair in Read/Write mode.
- Verify that the pairsplit is complete, and then use x-mount of the
secondary volume.
- Execute the backup.
- Restore the volumes to their previous state and resynchronize the
volume pair (ShadowImage and TrueCopy).
•
Resynchronizing pairs (pairresync)
The pairresync command re-establishes a split pair, and then restarts the
update copy operations to the secondary volume (see
pairresync command can resynchronize either a paired logical volume or a
group of paired volumes. The normal direction of resynchronization is from
the primary volume to the secondary volume. If the -restore option is
specified (ShadowImage only), the pair is resynchronized in the reverse
direction (that is, secondary volume to primary volume).
shows
the normal and restore resync operations. The primary volume is read and
write accessible during pairresync. The secondary volume becomes write-
disabled when the pairresync command is issued.
lists and describes the pairresync command parameters and
returned values. The primary volume’s host is automatically detected by the
pairresync command, so the host does not need to be specified in the
pairresync command parameters.
The pairresync command terminates before resynchronization of the
secondary (or primary) volume is complete. Use the pair event waiting or
pair display command to verify that the resync operation completed
successfully (status changes from COPY to PAIR). The execution log file also
shows completion of the resync operation. The status transition of the
paired volume is judged by the status of the primary volume.
Note 1:
If the primary volume is divided by LVM or partition, the control
information of LVM or partition on the primary volume is also copied to the
secondary volume. When executing the backup from the secondary
volume, import this control information and execute pairsplit when
activating the secondary volume.
Note 2:
TCE takes some time for the pair splitting in order to reflect the P-
VOL data on the
S-VOL.
Note 3:
TCE can split V-VOL of the SnapShot pair cascaded with the
secondary volume through the instruction issued from the primary host
leaving the pair status as PAIR. From the above, backup data can be
collected online more smoothly.
Summary of Contents for AMS 2000 Series
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