I think this will make you able to aggregate disks on different servers into which you should hold the cyrus spool.
Anyone tried this out ? http://www.redhat.com/software/rha/gfs/
Nat
Sten Fredriksson wrote:
On Apr 4, 2005 10:34 AM, Phil Brutsche <[EMAIL PROTECTED]> wrote:
Sten Fredriksson wrote:
Hi,
I know that this has been up before but after searching I found a fix that maybe have changed the thought on NFS as back end storage [1]
[...]
If NFS Is a big no no (as it's almost always are by default) how would I build a back end that is redundant/fail-over?
While NFS may work under RHEL, there's still no guarantee that it will work correctly under other operating systems, or even other Linux distributions. Therefore I doubt the maintainers will update the FAQ.
What some people do for fail-over is use some sort of heartbeat mechanism that will detect when the "master" is unavailable and cause the "slave" to take over the IP address (if one isn't using the MURDER aggregator), mount the volumes, etc.
The volumes would be shared between multible machines using:
a) a shared SCSI bus b) fiber channel SAN c) DRBD (http://www.drbd.org/)
This will give you active/passive failover.
While you could theoretically share the volumes between 2 (or more) computers directly for active/active failover, you run into many of the same problems as with NFS (mmap not working right over the cluster file system, etc). It would also require the use of the pre-alpha Cyrus IMAP 2.3 code.
Would it still be "big no no" if back ends store their mail on NFS mounted storage but not sharing and use some sort of heartbeat (keepalived / heatbeat etc) to take over the ip and mount up the storage. Or is NFS even if not sharing mail storage is not supported and/or recommended at all?
DRBD (http://www.drbd.org/) looks interesting. Do anyone of you use it and how does it work for you?
// Sten --- Cyrus Home Page: http://asg.web.cmu.edu/cyrus Cyrus Wiki/FAQ: http://cyruswiki.andrew.cmu.edu List Archives/Info: http://asg.web.cmu.edu/cyrus/mailing-list.html
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Natalino Picone - [EMAIL PROTECTED]
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It's a horrible thing to be on top of the world and then to lose it and try to get it back.
It's a whole lot harder the second time.
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