[Linux-cluster] Running GFS without fencing and maybe locking ; -)

[David Teigland]

On Thu, Mar 23, 2006 at 10:42:00AM +0100, Arnd wrote:
> So even if I'm adding two hosts to the cluster with write access then
> how can I control, that if one of these nodes fails, the other node with
> write access is replaying the journal (and not the node which is doing
> the fencing and has the filesystem mounted readonly)?

This looks like another problem in gfs.  We need can't have a readonly
node potentially preventing a rw node from doing recovery.  (The ro node
shouldn't be taking the journal lock if it can't eventually do the
recovery.)

> Ok, back to the tests. Both nodes (adnux2 and adnux3) weren't able to
> access the filesystem after adnux4 failed:
> 
> adnux3 data # ls -l /home/data/gfs
> ls: /home/data/gfs: Input/output error

This looks like the fs might have been withdrawn (shutdown) after gfs
found some inconsistency.

Dave