[Linux-HA] active/passive and SAN

[Dejan Muhamedagic]

On Wed, Jun 27, 2007 at 12:37:37PM +0200, FG wrote:
> Hi all,
> 
> I need some advices about my configuration for 
> high-availability.
> I would like to set up an active/passive 
> configuration for our POP/IMAP
> server.
> 
> We have two servers with each one two HBA cards 
> (FC) attached to a SAN
> IBM DS4000 where we store the mailbox.
> 
> My concern:
> In case of a failure,  i'm worry about  corruption 
> data  if the  backup
> server attempts  to mount the mailstore (located 
> on the san)  whereas
> the first one is not really dead or if the first 
> one doesn't umount the
> mailstore on the SAN  (for example  in a case of 
> network failure).
> 
> I read, of course, we can use STONITH to ensure 
> the first would be dead.
> For my configuration, do i really need this ?

Yes, you should use STONITH.

> Or perhaps somebody knows that a  SAN DS4000 can 
> give access to the
> logical drive for the second server and block the 
> access to the first one ?

It is probably possible in case you have a fc switch, but
heartbeat doesn't support dynamic fc reconfiguration.

> If someone have experience with heartbeat and IBM 
> SAN in an
> active/passive configuration, i'm interested...
> 
> Thanks a lot
> Best regards
> 
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-- 
Dejan