Backend-storage on NFS?

Natalino Picone natlist at
Mon Apr 4 05:42:43 EDT 2005

What about using GFS instead of NFS ?
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 ?


Sten Fredriksson wrote:
> On Apr 4, 2005 10:34 AM, Phil Brutsche <phil at> wrote:
>>Sten Fredriksson wrote:
>>>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 (
>>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 ( looks interesting. Do anyone of you use it 
> and how does it work for you?
> // Sten
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Natalino Picone - nat at
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