This section describes tape backup operations for differential snapshot high-speed backups. For the information on disk backup operations, refer to "Operation" in "Backup Operation by the QuickOPC Function" in the "ETERNUS SF AdvancedCopy Manager Operator's Guide" for the operating system of the target Storage Server.
Differential snapshot high-speed backups are performed by specifying the -T option for "11.2.2.1 acmbackup (Backup command)".
QuickOPC backup operations are performed as follows:
Execute "11.2.2.1 acmbackup (Backup command)" with the -T option and the -m DISK option specified.
When the command is executed, the physical copy and tracking processing starts. When the physical copy completes, the tracking processing continues to run alone.
Data updates (User operations) are performed on the transaction volume where the QuickOPC function was executed in step 1.
Execute "11.2.2.1 acmbackup (Backup command)" with the -T option and the -m DISK option specified
When the command is executed the second and subsequent times, only differential data that has been updated since the previous OPC ran (the data updated in step 2) is physically copied to the disk.
If the -m BOTH option is also specified with the -T option, or if the -m option is not specified, after the disk is backed up, data will be copied to tape from the backup destination disk on a volume basis (that is, not just the differential data but the entire volume including the differential data).
[Command execution example]
# /opt/FJSVswstc/bin/acmbackup -T /dev/dsk/c1t0d1s1 /dev/dsk/c1t0d1s1 acmbackup completed # |
For tape backups, data is copied to tape from the backup destination disk of the transaction volume. Therefore, there is no difference between conventional snapshot high-speed backups and differential snapshot high-speed backups.
Note
The -m TAPE option cannot be specified when the -T option is specified, as the command will produce an error.
Backup history information can be displayed using "11.2.2.9 acmhistdisp (History information display command)".
To delete backup history information, use "11.2.2.10 acmhistdel (History information delete command)".
There is no difference in tape history display and deletion operation between conventional snapshot high-speed backups and differential snapshot high-speed backups.
For disk histories, the OPC session is not released even if the history that was created for a differential snapshot high-speed backup is deleted. (While a physical copy is being performed, the physical copy will not be stopped.)
If a conventional snapshot high-speed backup has been performed, then the backup volume will be released when the history is deleted. "Backup (free)" will be displayed in the "Device-Mode" column when "11.2.1.4 acmdevdisp (Device operating status display command)" is executed.
If a differential snapshot high-speed backup has been performed, then the backup volume will not be released even after the history is deleted. In this case, "Backup (used)" will be displayed in the "Device-Mode" column when "11.2.1.4 acmdevdisp (Device operating status display command)" is executed. However, if the -u option is specified for "11.2.1.4 acmdevdisp (Device operating status display command)", "Backup (used-T)" will be displayed in the "Device-Mode" column, making it possible to verify that the backup volume is in the tracking status and the history has been deleted.
For differential snapshot high-speed backup operations, histories that have been backed up to tape are restored to the copy destination on a volume basis (that is, not just the differential data but the entire volume containing the differential data). This procedure for restoring data to the transaction volume is the same as the conventional restoration processing.
# /opt/FJSVswstc/bin/acmrestore /dev/dsk/c1t0d1s1 /dev/dsk/c1t0d1s1 acmrestore completed # |
For restoration from disk, refer to "Restoration" in "Backup Operation by the QuickOPC Function" in the "ETERNUS SF AdvancedCopy Manager Operator's Guide" for the operating system of the target Storage Server.
The execution status of tracking processing for QuickOPC can be displayed using "11.2.2.16 acmtrkstat (Tracking status display command)". Information for OPC sessions that are not currently tracking will not be displayed. Additionally, during tracking, the amount of data that has already been updated since the execution of the QuickOPC (logical copy) will be displayed as a percentage in the "Update" column.
# /opt/FJSVswstc/bin/acmtrkstat Server Transaction-Disk Backup-Disk Status Execute Update SV1 /dev/dsk/c1t0d1s1 /dev/dsk/c1t0d2s1 tracking ---- 12% SV1 /dev/dsk/c1t0d4s1 /dev/dsk/c1t0d3s1 executing 75% ---- SV1 /dev/dsk/c1t0d6s1 /dev/dsk/c1t0d7s1 executing 31% ---- # |
The relationship between the "Status" column and the OPC session is as follows:
Status column | OPC session status |
|---|---|
"executing" | Physical copy and tracking both in progress |
"tracking" | Tracking in progress |
Stop tracking processing using "11.2.2.15 acmcanceltrk (Tracking cancel command)".
# /opt/FJSVswstc/bin/acmcanceltrk /dev/dsk/c1t0d1s1 -bd /dev/dsk/c1t0d2s1 /dev/dsk/c1t0d1s1 acmcanceltrk completed # |
If the physical copy and tracking processing are both in progress, only the tracking processing will be stopped.
