In this section, operation outline of snapshot creation using command is explained.
Please use it as a reference when configuring the environment.
For details, see the Command Reference.
1) Joining the proxy volume with master volume
Join the proxy volume with the master volume, and copy the master volume data to the proxy volume. Before joining them, stop the proxy volume.
Information
When Class1 is a shared class, stop Volume2 on all nodes in the class scope by using the sdxvolume -F command with the -e allnodes option.
Example: Master volume Volume1 and proxy volume Volume2 will be joined.
# sdxvolume -F -c Class1 -v Volume2 # sdxproxy Join -c Class1 -m Volume1 -p Volume2 |
After returning from the command, synchronization copying will automatically be performed.
Information
-m option and -p option can indicate groups as well as volumes. When indicating a group, all volumes within the group will be copied. When specifying groups, it is necessary to use the -a option.
2) Confirming the completion of copying
Confirm that the synchronization copying is complete.
Example: Confirming synchronization copying of proxy volume (Volume2) is complete.
# sdxinfo -S
OBJ CLASS GROUP DISK VOLUME STATUS
------ ------- ------- ------- ------- --------
slice Class1 Group1 Disk1 Volume1 ACTIVE
slice Class1 Group1 Disk2 Volume1 ACTIVE
slice Class1 Group2 Disk3 Volume2 STOP
slice Class1 Group2 Disk4 Volume2 STOP |
If all the displayed slices' STATUS fields are "STOP," synchronization copying is complete.
If the synchronization copying is still in progress, "COPY" will be displayed in the STATUS field.
3) Creating a snapshot
In order to create a snapshot, part the proxy volume from the master volume after confirming that synchronization copying is complete.
# sdxproxy Part -c Class1 -p Volume2 |
Note
In order to create a snapshot properly, you should either stop the application, or secure integrity at the file system layer or database layer that is managing the data. For instance, if you are using the file system, use the lockfs(1M) command to write-lock the file system before separating the proxy volume from the master volume.
4) Creating a backup
In order to make a data backup from the snapshot you created, follow the procedures of whatever backup tool you are using.
If you are not using the snapshot function after creating the backup, cancel the master-proxy relationship.
5) Rejoining the proxy volume with master volume
In order to synchronize the proxy volume with the master volume again, remove the created snapshot, and rejoin the proxy volume with the master volume. Before rejoining them, stop the proxy volume.
Information
If Class1 is a shared class, use the -e allnodes option with the sdxvolume -F command to stop Volume2 on all the nodes within the class scope.
# sdxvolume -F -c Class1 -v Volume2 |
Synchronization copying will be performed as in procedure 1).
When creating more than one backup using the same proxy volume, repeat procedures 2) to 4).
6) Canceling the master-proxy relationship
Cancel the master-proxy relationship, and finish using the snapshot function.
# sdxproxy Break -c Class1 -p Volume2 |
