How to reduce /var using OnlineJFS

[EU-Admins-UNIX]

Hi

I'm currently raising a change request to increase /var from 8GB to 10GB. I'll just be doing this through SMH.

But our change system is asking for Reversion plan.  I'd have no reason to revert, but as there is no option in SMH to reduce an LV, how would one achieve this on command line?  Do I have the necessary softwaer to do this with ZERO downtime?

I'm running:

B3929FB                               B.05.00.01     OnlineJFS for Veritas File System 5.0 Bundle

Regards

Tariq

[Dennis Handly]

>Do I have the necessary software to do this with ZERO downtime?

I don't think there is software to do this.  You would have to backup, reduce then restore.

[EU-Admins-UNIX]

Hi Dennis

I practised on a test server.

I used:

fsadm -F vxfs -d -D -e -E /var         (whether necessary, I don't know)

fsadm -F vxfs -b 8192M /var           (originally /var was 10240M)

lvreduce -L 8192 /dev/vg00/lvol8  (worked a treat)

ZERO downtime!

Regards

Tariq

[Dennis Handly]

>I practised on a test server.

I assume this depends on whether you have ever written to the end of the LUN.

[Patrick Wallek]

>>I assume this depends on whether you have ever written to the end of the LUN.

That is true, which is why he did the 'fsadm' command to reorganize directories and extents.  Now whether or not that would move an extent that the end of the filesystem to a different spot on the LUN, thus freeing space at the end of the LUN, I don't know.