Decrease /opt and increase /usr

[Sergej_5]

Hi there!
Please help me to resolve the following problem:

#bdf
Filesystem kbytes used avail %used Mounted on
/dev/vg00/lvol3 4534272 3837400 691456 85% /
/dev/vg00/lvol1 295024 57816 207704 22% /stand
/dev/vg00/lvol4 3072000 1379240 1680920 45% /var
/dev/vg00/lvol7 1241088 1189024 51680 96% /usr
/dev/vg00/lvol6 7028736 4431000 2577472 63% /opt
/dev/vg00/lvol5 20480 2360 17984 12% /home

- I got OnlineJFS installed:
# swlist |grep -i jfs
B5118CA B.11.11 HP OnLineJFS
- I have defrag my /opt with:
# fsadm -F vxfs -D -E -d -e /opt

Succesfully!
Now when i want to reduce size of /opt for 1000MB it says:
# lvreduce -L 1000 /dev/vg00/lvol6
The Logical Volume has a mounted filesystem on it.
Logical volume "/dev/vg00/lvol6" is not reduced.

How can i make to reduce lvol name /opt for 1000MB and increase /usr with that 1000MB's?
Is there any way to do it in SAM ?

[Leif Halvarsson_2]

Hi,

Increasing an filesystem online is OK but I doubt if there is an reliable way to reduce a filesystem without risk of loosing data.

The most reliable way, in your case, to change the allocation for vg00 is to use Ignite but, of course this needs some downtime.

You can also do temporary "workaround", moving some data from /usr to /opt and create links in /usr.

[John Waller · Accepted solution]

I am probably wrong but wouldn't you need to fsadm -b to specify a the new smaller size for the /opt filesystem. The -D -E -d -E only reports and defrags, I would have thought you would have to reduce the size of the filesyetem before you reduce the size of the lvol.
If you still have an issue with the filesystem mounted then you will need to do this in single user mode. with just the /usr filesystem mounted.

[Borislav Perkov]

Hi,
Definitely you can do it with Ignite, especialy reducing the /usr. Make Ignite tape with -I option. Boot from tape, choose HP Installation, go to Filesystem tab and make appropriate change on /opt and /usr.
regards,
Borislav

[Sergej_5]

I got a patch who wants to increase of /usr
I dont want to make symbolic links ...

Please do write only practicable solutions :)

I do got Ignite-UX server ... but how can i made above problem resolved?

Brgds,
Sergej

[Leif Halvarsson_2]

Hi,
If you want to try reducing the filesystem/logical volume online you must first resize the filesystem using the "-b" option in fsadm, before trying to reduce the logical volume.

[Steven E. Protter]

Take a backup prior to reduction of a filesystem. You can not reduce the point where there is no usable free space, fsadm/OnlineJFS will simply refuse to do so.

SEP

[Sergej_5]

I have found it to work! :)
Thnx to Leif Halvarsson!

Brgds,
Sergej

[Jannik]

Backup everything on this lvol.

fsadm -b"new_size"M /dev/vgxx/xxxx
lvreduce -L "new_size"M /dev/vgxx/xxxx

[Sergej_5]

Hi!
The right order was/is:

1) fsadm -F vxfs -b 6144m /opt
2) lvreduce -L 6144 /dev/vg00/lvol6
3) lvextend -L 1024M /dev/vg00/lvol7
4) fsadm -F vxfs -b 1024m /usr