Hitachi AMS 2000 Series, Reference Manual

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Performing CCI Operations
1–19
Hitachi AMS 2000 Family Command Control Interface (CCI) Reference Guide
Figure 1-12: Pair Split Command -S Option
Timing of pairsplit operations
Since a pair is split at the time when the pairsplit command is issued, verify
that writing onto pair volumes is fixed before issuing the command.
• Instantaneous offline backup of the UNIX file system:
- Unmount the primary volume, and then split the volume pair.
- Mount the primary volume (mount).
- Verify that the pairsplit is complete, and mount the secondary
volume (mount –r).
- Execute the backup.
- Restore the volumes to their previous state, and resynchronize the
volume pair (ShadowImage and TrueCopy).
• Online backup of the UNIX file system:
- Issue the sync command to a mounted primary volume to flush
the file system buffer, and then split the volume pair in Read/Write
mode.
- Verify that the pairsplit is complete, and then use the fsck
command to check the consistency of the secondary volume file
system.
- Mount (mount) the secondary volume.
- Execute the backup.
- Restore the volumes to their previous state and resynchronize the
volume pair (ShadowImage and TrueCopy).
• Instantaneous offline backup of the Windows 2000 and Windows Server
file systems:
- Execute
–x unmount of the primary volume, then split the volume
pair.
- Execute x-mount of the primary volume.
- Verify that the pairsplit is complete, then execute –x mount of the
secondary volume.
- Execute the backup.
- Restore the volumes to their previous state, and resynchronize the
volume pair (ShadowImage and TrueCopy).
C:\HORCM\etc>pairsplit –g VG01 –S


C:\HORCM\etc>pairdisplay –g VG01

Group PairVol(L/R) (Port#,TID, LU-M) ,Seq#,LDEV#.P/S,Status, Seq#,P-LDEV# M

VG01 oradb1(L) (CL1-A , 1, 1-0 )85000174 1.SMPL ----,----- 2 -

VG01 oradb1(R) (CL1-A , 1, 2-0 )85000174 2.SMPL ----,----- 1 –