Extending a filesystem for AIX

To begin, make sure you are either logged in as either root or any accounts with admin privileges like cecuser with sudo.

• To become root, run sudo -i
• With cecuser, run sudo in front of any command

Start with the command lsvg rootvg

- Included below is an example output:

cecadmin@p125:/home/cecadmin $ lsvg rootvg

VOLUME GROUP:       rootvg                   VG IDENTIFIER:  00c3545000004b00000001945fc059be

VG STATE:           active                   PP SIZE:        64 megabyte(s)

VG PERMISSION:      read/write               TOTAL PPs:      799 (51136 megabytes)

MAX LVs:            256                      FREE PPs:       380 (24320 megabytes)

LVs:                12                       USED PPs:       419 (26816 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

PV RESTRICTION:     none                     INFINITE RETRY: no

DISK BLOCK SIZE:    512                      CRITICAL VG:    no

FS SYNC OPTION:     no                       CRITICAL PVs:   no

ENCRYPTION:         yes

Find the section FREE PPs. In the output above, you can see that there are 24 GB free highlighted in yellow.

From there, run df -g and you can see the size of “/” that is currently full (but this can be used to expand any filesystem, not only /)

- In the output below, you can see that 100% of filesystem /dev/hd4 is being used.

cecadmin@p125:/home/cecadmin $ df -g

Filesystem    GB blocks      Free %Used    Iused %Iused Mounted on

/dev/hd4           0.12      0.00  100%     2843    88% /

/dev/hd2           2.56      0.23   92%    50203    48% /usr

/dev/hd9var        1.00      0.91    9%     1022     1% /var

/dev/hd3           4.00      4.00    1%       40     1% /tmp

/dev/hd1           8.00      3.14   61%     2018     1% /home

/dev/hd11admin     0.12      0.12    1%        5     1% /admin

/proc                 -         -    -        -      - /proc

/dev/hd10opt       4.00      3.02   25%    11851     2% /opt

/dev/livedump      0.25      0.25    1%        4     1% /var/adm/ras/livedump

/ahafs                -         -    -        35     1% /aha

This can be extended with the command chfs -a size=2G /
You can replace / with the filesystem you want to extend like /opt or /usr

- Example output below:

cecadmin@p125:/home/cecadmin $ sudo chfs -a size=2G /

Filesystem size changed to 4194304

From there, run df -g again.

-  In the below output, you can now see that only 7% of /dev/hd4 is being used.

cecadmin@p125:/home/cecadmin $ df -g

Filesystem    GB blocks      Free %Used    Iused %Iused Mounted on

/dev/hd4           2.00      1.87    7%     2843     1% /

/dev/hd2           2.56      0.23   92%    50203    48% /usr

/dev/hd9var        1.00      0.91    9%     1022     1% /var

/dev/hd3           4.00      4.00    1%       40     1% /tmp

/dev/hd1           8.00      3.14   61%     2018     1% /home

/dev/hd11admin     0.12      0.12    1%        5     1% /admin

/proc                 -         -    -        -      - /proc

/dev/hd10opt       4.00      3.02   25%    11851     2% /opt

/dev/livedump      0.25      0.25    1%        4     1% /var/adm/ras/livedump

/ahafs                -         -    -        35     1% /aha

You have now expanded space for your AIX filesystem!

To summarize, the two commands being used are:

lsvg rootvg | grep FREE

chfs -a size=xxG /       # or any other filesystem /opt /usr (chfs -a size=xxG /opt)