lvreduce

[Sridhar R]

Hi,

I am in process of reducing a lvol size from 6 GB to 5 GB.

I perforemed,

#umount /app
#lvreduce -L 5120 /dev/vg00/lvol4


I got a warning stating that data corruption will occur. But still i gave yes, since i don't have any data...

It gave me a message "lvol successfully reduced".

But, when i tried mounting file system again, it gave me an error:

#mount /dev/vg00/lvol4 /app

It gives me the message:

"vxfs mount: /dev/vg00/lvol4 is corrupted. needs checking"

I wasn't able to mount back the file system.

As a result of this, i performed an lvremove and lvcreate.

But, why am i unsuccessful with lvreduce.

Did i miss anything?

Thanks!

[Torsten.]

The problem is, when you reduce the size of the lvol, you will cut/destroy/corrupt the file system on this lvol. That's why you get the error while mounting. Without online jfs you are not able to reduce the file system size, so you need to re-create the filesystem (this will finally destroy the data on it, for this reason you get the warning from lvreduce).

[psreedhar]

Before reducing the LVOL you "should" have reduced the file system on that, other wise data loss will happen.

[Sridhar R]

HI,

I Just missed a line before mounting.

#newfs -F vxfs -o largefiles /dev/vg00/rlvol4

And then, did a

#mount /dev/vg00/lvol4 /app


I was able to see the lvol size reduced from the bdf output.

Thanks for the replies!

[Sridhar R]

Thnx