We are now going to discuss extending a filesystem under JFS on AIX machine. It is really pretty simple, actually in just 3 commands (including the checking) we could easily extend an AIX filesystem. But for the benifit of everybody, I would include extra checking and commands for us to fully appreciate this task.
Check your filesystems current size and % utilization:
[root@aix] / > df -g /ora/fs1263/u06
Filesystem GB blocks Free %Used Iused %Iused Mounted on
/dev/or1263u06 150.00 53.07 65% 118 1% /ora/fs1263/u06
Check your Logical Volume and see what Volume Group it resides:
[root@aix] / > lslv or1263u06
LOGICAL VOLUME: or1263u06 VOLUME GROUP: datavg
LV IDENTIFIER: 000000000108ffffffff.6 PERMISSION: read/write
VG STATE: active/complete LV STATE: opened/syncd
TYPE: jfs2 WRITE VERIFY: off
MAX LPs: 2048 PP SIZE: 256 megabyte(s)
COPIES: 1 SCHED POLICY: parallel
LPs: 600 PPs: 600
STALE PPs: 0 BB POLICY: relocatable
INTER-POLICY: minimum RELOCATABLE: yes
INTRA-POLICY: middle UPPER BOUND: 32
MOUNT POINT: /ora/fs1263/u06 LABEL: /ora/fs1263/u06
MIRROR WRITE CONSISTENCY: on/ACTIVE
EACH LP COPY ON A SEPARATE PV ?: yes
Serialize IO ?: NO
Check the information regarding the Volume Group, this includes the free PP’s and PP size:
[root@aix] / > lsvg datavg
VOLUME GROUP: datavg VG IDENTIFIER: 000000000108ffffffff
VG STATE: active PP SIZE: 256 megabyte(s)
VG PERMISSION: read/write TOTAL PPs: 2626 (672256 megabytes)
MAX LVs: 256 FREE PPs: 576 (147456 megabytes)
LVs: 19 USED PPs: 2589 (662784 megabytes)
OPEN LVs: 19 QUORUM: 4 (Enabled)
TOTAL PVs: 7 VG DESCRIPTORS: 7
STALE PVs: 0 STALE PPs: 0
ACTIVE PVs: 7 AUTO ON: yes
MAX PPs per VG: 32512
MAX PPs per PV: 1016 MAX PVs: 32
LTG size (Dynamic): 256 kilobyte(s) AUTO SYNC: no
HOT SPARE: no BB POLICY: relocatable
If you have available PPs for your desired filesystem, let us extend it:
[root@aix] / > chfs -a size=+134G /ora/fs1263/u06
Filesystem size changed to 595591168
How is our filesystem now:
[root@aix] / > df -g /ora/fs1263/u06
Filesystem GB blocks Free %Used Iused %Iused Mounted on
/dev/or1263u06 284.00 187.05 35% 118 1% /ora/fs1263/u06
If in case you encounter an error message:
0516-787 extendlv: Maximum allocation for logical volume or1263u06
is 1024.
Check on the maximum LPs for the Logical Volume – this must be increased to accomodate the new size. Where LPs = LV in MB / LP in MB then change the maximum LP to the ouput:
[root@aix] / > chlv -x 2048 or1263u06
There you have it from start to finish with some troubleshooting tips.
See you on my next note!!!
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