[Linux-HA] active/passive and SAN

[Fabrice Grelaud]

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 ?
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 ?

If someone have experience with heartbeat and IBM SAN in an 
active/passive configuration, i'm interested... 

Thanks a lot
Best regards


-- 
Fabrice GRELAUD
05 40 00 - 65 92
Direction des Ressources Informatiques et Multimedia Mutualisees