[DRBD-user] Mirroring between NFS servers

Mark Watts m.watts at eris.qinetiq.com
Fri Oct 26 17:28:11 CEST 2007

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.


On Friday 26 October 2007 16:14:25 Bernd Schubert wrote:
> On Friday 26 October 2007 16:43:20 Mark Watts wrote:
> > On Friday 26 October 2007 15:32:07 Saqib Jang wrote:
> > > Hi there,
> > > I'm new to DRBD, have a quick question.
> > >
> > > Can DRBD be used for active/passive real-time replication
> > > between NFS servers? By real-time, I'm refering to in-process
> > > NFS client requests being affected but new NFS client requests
> > > going to the passive NFS server?
> >
> > DRBD could be used as the backing store for an HA NFS pair, but I believe
> > NFS clients would have to reconnect on fail-over since file-handle state
> > is stored in memory, not on disk.
>
> Huh, what gives you that idea? NFS up to NFSv3 ist stateless, there no
> filehandle stored at all. For failover you need to have the very same inode
> numbers and generation numbers, which is why you need shared storage such
> as drbd.

I stand corrected. My knowledge of this area has just increased.

Thanks,

Mark.

-- 
Mark Watts BSc RHCE MBCS
Senior Systems Engineer
QinetiQ Trusted Information Management
Trusted Solutions and Services Group
GPG Key: http://keyserver.veridis.com:11371/search?q=0x455420ED
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