Shrinking to a Given Length in Vxvm

3.1 Shrinking to a Given Length
Shrink a volume to a specific length as follows:
· vxassist shrinkto volume_name length
Make sure you do not shrink the volume below the current size of the file system or database using the volume. This command can be safely used on empty volumes.
To shrink volcat to 1300 sectors, type:
· #vxassist shrinkto volcat 1300
3.2 Shrinking by a Given Length
Shrink a volume by a specific length as follows:
· vxassist shrinkby volume_name length
To shrink volcat by 8000 sectors, type:
· #vxassist shrinkby volapp2 8000

4. Removing a Volume
Removing a volume requires removing all references to the volumes to be removed like unmounting the volume if mounted and removing its reference from /etc/vfstab .
An active volume has to be stopped first to stop all the activities to the volume only then it can be removed
Stopping Volume
Command Syntax
· vxvol stop volume_name
To stop appvol1
· #vxvol stop appvol1
Removing Volume
Command Syntax
· vxedit -rf rm volume_name
To remove the volume appvol1
· #vxedit -rf rm appvol11

5. Mirroring a Volume
Mirroring allow data to be written simultaneously to two disks so that in case of failure of one disk data is available from the other mirrored disk. Boot disks can be mirriored to provide alternate booting disk .
5.1 Creating & Mirroring a New Volume
Command Syntax :
· vxassist make volume_name length layout=mirror
To create the mirrored volume, appvol22 of 100mb
· #vxassist make appvol22 100m layout=mirror
To create a volume with Dirty Region Logging enabled
· #vxassist make volume_name length layout=mirror,log
5.2 Mirroring an Existing Volume
Command syntax
· vxassist mirror volume_name
Creating a mirror of volume vol44:
· #vxassist mirror vol44
5.3 Mirroring All Volumes
To mirror all existing volumes to available disk space
· /etc/vx/bin/vxmirror -a