[Linux-cluster] Can I shrink/grow one GFS{12} FileSystem?

[Derek Anderson]

Sorry, I missed the part about you using GNBD.

It's been awhile, and I haven't tested it, but I think the safest procedure might be:
1. Unmount from gnbd clients.
2. Un-import from gnbd clients.
3. Un-export gnbd devices from the server _without_ the Override option.
4. Extend the VG and LV.
5. Re-export the gnbd device from the server.
6. Re-import gnbd devices from clients.
7. Re-mount gnbd devices on clients.
8. Run gfs_grow from one client.

Hopefully, gnbd_serv won't complain about the device size changing underneath it if that device is not currently exported.  If  it does you will probably need to stop and restart it around step 4.

Overriding the unexport of gnbd devices can be hazardous.  See the warning in gnbd_export(8).

Good luck:
- Derek

-----Original Message-----
From: linux-cluster-bounces at redhat.com [mailto:linux-cluster-bounces at redhat.com] On Behalf Of Tiago Cruz
Sent: Friday, April 04, 2008 2:59 PM
To: linux clustering
Subject: RE: [Linux-cluster] Can I shrink/grow one GFS{12} FileSystem?

Anderson and Gary,

Many thanks for your attention!

I've did one test here, and works perfectly!

I just have one problem, because I need to restart my gnbd_serv, and
re-export the GNDB device for nodes, because I've got this error
messages:

Apr  4 16:40:15 xen-7 gnbd_serv[23817]: ERROR size of the exported file /dev/Vol_LVM/mycluster has changed, aborting 
Apr  4 16:40:15 xen-7 gnbd_serv[23817]: server process 2956 exited because of signal 11 
Apr  4 16:40:15 xen-7 kernel: gnbd_serv[2956]: segfault at 000000000000000c rip 0000000000405ab0 rsp 00007fff36dcb450 error 4
Apr  4 16:41:10 xen-7 gnbd_serv[2970]: startup succeeded 
Apr  4 16:41:17 xen-7 gnbd_serv[2970]: got local command 0x1 
Apr  4 16:41:17 xen-7 gnbd_serv[2970]: gnbd device 'cluster' serving /dev/Vol_LVM/mycluster exported with 41943040 sectors 


But I did another test, and this time I've just "restart" the export
using:
# gnbd_export -R -O
# gnbd_export -c -d /dev/Vol_LVM/mycluster -e cluster

And sounds like fine on the nodes... but I don't know if this process
it's recommend, or if this force (-O  Force unexport) can be dangerous
for the filesystem...

Thanks


On Fri, 2008-04-04 at 14:22 -0500, Derek Anderson wrote:

> You can grow the filesystem with gfs_grow, once the underlying device
> has been expanded.  See gfs_grow(8) for more information.


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