How To Expand A Filesystem in AIX

How To Expand A Filesystem in AIX

On One  fine day our /data directory reached 90%. We have been alarmed to extend the file system.



Our /data directory reached 90%

# df -k /data
Filesystem 1024-blocks Free %Used Iused %Iused Mounted on
/dev/hd1 2097152 218780 90% 25894 30% /data
#

Do we have enough space available in VG to expand?

How much space is available in the VG?

# lsvg rootvg
VOLUME GROUP: rootvg VG IDENTIFIER: 0007b8420000d9000000011f2491100e
VG STATE: active PP SIZE: 128 megabyte(s)
VG PERMISSION: read/write TOTAL PPs: 599 (76672 megabytes)
MAX LVs: 256 FREE PPs: 282 (36096 megabytes)
LVs: 13 USED PPs: 317 (40576 megabytes)
OPEN LVs: 11 QUORUM: 2 (Enabled)
TOTAL PVs: 1 VG DESCRIPTORS: 2
STALE PVs: 0 STALE PPs: 0
ACTIVE PVs: 1 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
#

Use chfs command to expand
Examples
chfs -a size=4G /data
chfs -a size=4000M /data
chfs -a size=+4G /data
chfs -a size=+50M /data

What those mean
The “M” stands for megabytes
The “G” stands for gigabytes
The “+” is relative sizing: change the current amount by adding this much
Without the “+” is absolute sizing: change the current amount TO this much
.

Here we are increasing the filesystem by 2.5G or 2500M

Check before File system expansion

# df -k /data Filesystem 1024-blocks Free %Used Iused %Iused Mounted on
/dev/hd1 2097152 218780 90% 25894 30% /data

We'll Now Increase the Filesystem size to  2.5 G more.

# chfs -a size=+2500M /data Filesystem size changed to 5242880

Now Check the Filesystem again after increment

# df -k /data
Filesystem 1024-blocks Free %Used Iused %Iused Mounted on
/dev/hd1 2621440 742988 72% 25894 13% /data
#

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