2.9.2.2 Reducing a Non-root LVM Partition

Note:

  • This procedure does not require an outage on the server.

  • It is recommended that you back up your file system before performing this procedure.

The instructions and examples in this procedure are based on the partition supporting /u01.

  1. Use the df command to determine the amount of free and used space in the /u01 partition:
    # df -h /u01

    The following is an example of the output:

    Filesystem                    Size  Used Avail Use% Mounted on
/dev/mapper/VGExaDb-LVDbOra1  193G   25G  159G  14% /u01
  2. Use the lvm command to display the current logical volume configuration used by the /u01 file system.

    In this example, the size of the LVDbOra1 partition needs to be reduced so that LVDbSys2 (30.00 GB in size) can be created by the dbserver_backup.sh script. 

    # lvm vgdisplay VGExaDb -s
  "VGExaDb" 271.82 GB [250.04 GB used / 21.79 GB free]

# lvm lvscan
  ACTIVE            '/dev/VGExaDb/LVDbSys1' [30.00 GB] inherit
  ACTIVE            '/dev/VGExaDb/LVDbSwap1' [24.00 GB] inherit
  ACTIVE            '/dev/VGExaDb/LVDbOra1' [196.04 GB] inherit
  3. Shut down any software that uses /u01.

    The following software typically uses /u01:

    • Oracle Clusterware, Oracle ASM, and Oracle Database

      # Grid_home/bin/crsctl stop crs

    • Trace File Analyzer

      # Grid_home/bin/tfactl stop

    • ExaWatcher

      # systemctl stop exawatcher.service

    • Oracle Enterprise Manager agent 

      (oracle)$ agent_home/bin/emctl stop agent
  4. Unmount the partition as the root user.
    # umount /u01

    Note:

    If the umount command reports that the file system is busy, then use the fuser(1) command to identify the processes still accessing the file system that must be stopped before the umount command will succeed. 

    # umount /u01
umount: /u01: device is busy
umount: /u01: device is busy

# fuser -mv /u01

        USER      PID ACCESS COMMAND
/u01:   root     6788 ..c..  ssh
        root     8422 ..c..  bash
        root    11444 ..c..  su
        oracle  11445 ..c..  bash
        oracle  11816 ....m  mgr
        root    16451 ..c..  bash
  5. Verify the file system.
    # e2fsck -f /dev/VGExaDb/LVDbOra1

fsck 1.39 (29-May-2006)
e2fsck 1.39 (29-May-2006)
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information
DBORA: 72831/25706496 files (2.1% non-contiguous), 7152946/51389440 blocks
  6. Resize the file system to the required size (120G in the example below).
    # resize2fs /dev/VGExaDb/LVDbOra1 120G
resize2fs 1.39 (29-May-2017)
Resizing the filesystem on /dev/VGExaDb/LVDbOra1 to 26214400 (4k) blocks.
The filesystem on /dev/VGExaDb/LVDbOra1 is now 26214400 blocks long.
  7. Resize the LVM to the desired size.
    # lvm lvreduce -L 120G --verbose /dev/VGExaDb/LVDbOra1
    Finding volume group VGExaDb
  WARNING: Reducing active logical volume to 120.00 GB
  THIS MAY DESTROY YOUR DATA (filesystem etc.)
Do you really want to reduce LVDbOra1? [y/n]: y
    Archiving volume group "VGExaDb" metadata (seqno 8).
  Reducing logical volume LVDbOra1 to 120.00 GB
    Found volume group "VGExaDb"
    Found volume group "VGExaDb"
    Loading VGExaDb-LVDbOra1 table (253:2)
    Suspending VGExaDb-LVDbOra1 (253:2) with device flush
    Found volume group "VGExaDb"
    Resuming VGExaDb-LVDbOra1 (253:2)
    Creating volume group backup "/etc/lvm/backup/VGExaDb" (seqno 9).
  Logical volume LVDbOra1 successfully resized
  8. Mount the partition.
    # mount -t ext3 /dev/VGExaDb/LVDbOra1 /u01
  9. Verify the space was reduced.
    # df -h /u01
Filesystem                    Size  Used Avail Use% Mounted on
/dev/mapper/VGExaDb-LVDbOra1  119G   25G   88G  22% /u01

# lvm vgdisplay -s
  "VGExaDb" 271.82 GB [174.00 GB used / 97.82 GB free]
  10. Restart any software that was stopped in step 3.

    • Oracle Clusterware, Oracle ASM, and Oracle Database

      # Grid_home/bin/crsctl start crs

    • Trace File Analyzer

      # Grid_home/bin/tfactl start

    • ExaWatcher

      # systemctl start exawatcher.service

    • Oracle Enterprise Manager agent 

      (oracle)$ agent_home/bin/emctl start agent

Parent topic: Resizing a Non-root LVM Partition