How to Remove existing filesystems from Veritas Volume Manager

How to Remove existing filesystems from Veritas Volume Manager: (all the filesystems were under veritas)

Sometimes when databases will decommissioned, in that case we need to remove the unused filesystems from the Server in order to clean up the storage.

Below is the complete process which will present how to remove existing filesystem under vxvm. 
 
yogesh-test $ df -k | grep ORACLE

/dev/vx/dsk/yogesh-dg/ORACLE_admin 1048576   52834  935768     6%    /data/oracle/ORACLE/admin
/dev/vx/dsk/yogesh-dg/ORACLE_backup1 2084864  308850 1665020    16%    /data/oracle/ORACLE/backup1
/dev/vx/dsk/yogesh-dg/ORACLE_temp01 4194304  284281 3665654     8%    /data/oracle/ORACLE/temp01
/dev/vx/dsk/yogesh-dg/ORACLE_data01 36700160 17510880 17989955    50%    /data/oracle/ORACLE/data01
/dev/vx/dsk/yogesh-dg/ORACLE_data02 164626432 91177483 68858394    57%    /data/oracle/ORACLE/data02
/dev/vx/dsk/yogesh-dg/ORACLE_backup2 2084864  308850 1665020    16%    /data/oracle/ORACLE/backup2
/dev/vx/dsk/yogesh-dg/ORACLE_flashback 10485760   19038 9812559     1%    /data/oracle/ORACLE/flashback
 
 Note: Before proceeding with the activity, you should take the necessary outputs like vxprint, vxdg, vxdisk, vxinfo etc..
1.First check whether all the filesystems are in use or not.

#fuser -cu /data/oracle/ORACLE/admin

If the output show some userid/username it means those ID’s are sitting somewherer in the listed FS’s i.e Filesystem is open and some read/write operation are under progress. We need to kill them and clear the FS so that the FS should be clean/free before stopping the volume & before umounting. Usually this process is used to avoid any data loss during the read/write operation in case of open Filesystems.

#fuser -ck <FS-mountpoint>

2. Now we will proceed with the Volume stop and Filesystem unmount operation. If we will try to stop the volume before un-mounting the Filesystem  it will give errors as volumes are open, so we have to unmount the volumes first.

#vxvol -g yogesh-dg stop ORACLE_admin
# vxvol -g yogesh-dg stop ORACLE_admin
vxvm:vxvol: ERROR: Volume ORACLE_admin is currently open or mounted

It means we have to firstly un-mount the Filesystems and then proceed with the volume stop operation.

#umount /data/oracle/ORACLE/admin

3. After that stop the volumes:

#vxvol -g yogesh-dg stop ORACLE_admin
 
4. Check volume status by below command:

#vxprint -htv ORACLE_admin
 
#umount /data/oracle/ORACLE/backup1
#umount /data/oracle/ORACLE/temp01
#umount /data/oracle/ORACLE/data01
#umount /data/oracle/ORACLE/data02
#umount /data/oracle/ORACLE/backup2
#umount /data/oracle/ORACLE/flashback

#vxvol -g yogesh-dg stop ORACLE_backup1
#vxvol -g yogesh-dg stop ORACLE_temp01
#vxvol -g yogesh-dg stop ORACLE_data01
#vxvol -g yogesh-dg stop ORACLE_data02
#vxvol -g yogesh-dg stop ORACLE_backup2
#vxvol -g yogesh-dg stop ORACLE_flashback
 
5.Below command will remove the volumes:

#vxassist -g yogesh-dg remove volume ORACLE_admin
#vxassist -g yogesh-dg remove volume ORACLE_backup1
#vxassist -g yogesh-dg remove volume ORACLE_temp01
#vxassist -g yogesh-dg remove volumeORACLE_data01
#vxassist -g yogesh-dg remove volume ORACLE_data01
#vxassist -g yogesh-dg remove volume ORACLE_data02
#vxassist -g yogesh-dg remove volume ORACLE_backup2
#vxassist -g yogesh-dg remove volume ORACLE_flashback

or

#vxedit -g yogesh-dg -rf rm <volume-name>
 
#vxdisk -o alldgs list
 
#vxdisk -o alldgs list | grep -i yogesh-dg
 
#vxprint -htg yogesh-dg

#df -k | grep -i ORACLE
 
6. Check all the volumes have been cleared by below command:

#vxprint -htg yogesh-dg | grep -i ORACLE

Note: Here if your all Filesystems are unmounted from DG and you have to clean up the storage then you have to destroy the DG and free up the disks. 

#vxdg -g <DG> destory

#/etc/vx/bin/vxdiskunsetup -C <disk-name without S#>

or

#vxdg -g <DG> rmdisk <disk-name>

#/etc/vx/bin/vxdiskunsetup -C <disk-name without S#>

#vxdg -g <DG> destroy

 
7. Finally remove or hashed the removed Filesystems entries from /etc/vfstab file:

#cp /etc/vfstab /etc/vfstab.backup

#vi /etc/vfstab

#egrep “ORACLE_admin|ORACLE_backup1|ORACLE_temp01|ORACLE_data01|ORACLE_data02|ORACLE_backup2|ORACLE_flashback” /etc/vfstab
 
8. Done with the activity.