Recreating AIX Filesystems

This procedure can be used to re-create an AIX filesystem. You might do this to:

• Convert jfs to jfs2.
• Convert from jfs to largefile enabled jfs.
• Change NBPI for jfs.
• Shrinking a filesystem.
• etc.

Example

Converting a jfs filesystem called "/app/foo" to jfs2:

  Check existing configuration
# mount | grep foo
         /dev/foolv       /app/foo         jfs    Apr 06 15:12 rw,log=/dev/loglv00
         /dev/barlv       /app/foo/bar     jfs2   Apr 06 15:12 rw,log=/dev/hd8
# df -k | grep foo
/dev/foolv         196608    188628    5%      197     1% /app/foo
/dev/barlv          65536     61188    7%      309     3% /app/foo/bar
# lslv foolv
LOGICAL VOLUME:     foolv                  VOLUME GROUP:   rootvg
LV IDENTIFIER:      00508ada00004c00000000fffcbd4cdd.14 PERMISSION:     read/write
VG STATE:           active/complete        LV STATE:       opened/syncd
TYPE:               jfs                    WRITE VERIFY:   off
MAX LPs:            512                    PP SIZE:        64 megabyte(s)
COPIES:             1                      SCHED POLICY:   parallel
LPs:                3                      PPs:            3
STALE PPs:          0                      BB POLICY:      relocatable
INTER-POLICY:       minimum                RELOCATABLE:    yes
INTRA-POLICY:       middle                 UPPER BOUND:    32
MOUNT POINT:        /app/foo               LABEL:          /app/foo
MIRROR WRITE CONSISTENCY: on/ACTIVE
EACH LP COPY ON A SEPARATE PV ?: yes
Serialize IO ?:     NO
  Unmount filesystem and any lower mounted filesystems
# umount /app/foo/bar
# umount /app/foo
  Mount 'old' filesystem read-only
# mount -r /app/foo
  Create 'new' filesystem
# mklv -t jfs2 -y foolvnew rootvg 3
foolvnew
# crfs -v jfs2 -d /dev/foolvnew -m /mnt/app/foo -A yes
File system created successfully.
196396 kilobytes total disk space.
New File System size is 393216
  Mount 'new' filesystem
# mount /mnt/app/foo
  Copy data using favorite method
# cd /app/foo
# tar -cf - . | (cd /mnt/app/foo && tar -xf -)
  Unmount both filesystems
# cd /
# umount /mnt/app/foo
# umount /app/foo
  Delete 'old' filesystem
# rmfs /app/foo
rmlv: Logical volume foolv is removed.
  Rename 'new' filesystem
# chfs -m /app/foo /mnt/app/foo
# chlv -n foolv foolvnew
  Fix mount point permissions
# chmod 555 /app/foo
  Remount filesystems
# mount /app/foo
# mount /app/foo/bar
  Check
# mount | grep foo
         /dev/foolv       /app/foo         jfs2   Apr 06 15:12 rw,log=/dev/hd8 
         /dev/barlv       /app/foo/bar     jfs2   Apr 06 15:12 rw,log=/dev/hd8 
# df -k | grep foo
/dev/foolv         196608    194420    2%      184     1% /app/foo
/dev/barlv          65536     61188    7%      309     3% /app/foo/bar
  Clean up
# rm -rf /mnt/app