Looking for users of redhat-cluster-suite on Ubuntu
neil at brightbox.co.uk
Tue Jul 29 09:55:54 UTC 2008
2008/7/21 Etienne Goyer <etienne.goyer at canonical.com>:
> That is interesting. Can you expand a bit on the stale file handle
> problem you had with NFS? Was a public bug ever reported on the
> subject? Is it something that is easy to reproduce? If not, can you
> give a hint about the conditions that would trigger this problem?
It's not really a bug. It's a fundamental design problem with NFS and
NFS creates its file handles from the inode number of the file on the
server. If you have clustered servers then you must make sure that the
shared filesystem is *identical* at the inode level - and that
generally means that any file mirroring you do must be at filesystem
level, not file level. (DRBD generally or a posh SAN).
If you don't then as soon as the server changes identity, client NFS
will issue the dreaded 'stale file handle' error message and you're
out of action until you remount the share. NFS doesn't appear to have
an effective client side recovery on a cluster in Ubuntu. Or if it
does it isn't on by default.
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