[Linux-cluster] IMAP server clustering ...

[Michael Gale]

I was reading up on Courier IMAP which use dot-locking with support NFS 
mounted maildirs.

So would that application not take care of the locking ?

Michael.


linux-cluster at spam.dragonhold.org wrote:
> On Mon, Nov 01, 2004 at 11:37:18AM -0500, Lon Hohberger wrote:
> 
>>On Thu, 2004-10-28 at 18:01 -0600, Michael Gale wrote:
>>
>>>But would you even need the GFS file system then ? Could each box just 
>>>be accessing a reiserfs via the FC ? and let the application take care 
>>>of the "locking" ?
>>
>>No, because metadata creation would not be synchronized.  You'd end up
>>with a corrupt file system tree.
> 
> 
> It's not just the creation, it's the caching too, surely?  The problem is that each system
> would end up with a different set of cached data (data & metadata), more than anything.
> 
> If there was a way to get it to invalidate the cached data as required, and also serialise
> access so that 2 machines don't try to access the same bit of the filesystem at the same
> time, then it would work.
> 
> And at that point, you've got GFS, AFAICT.
> 
> Graham
> 
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-- 
Michael Gale
Lan Administrator
Utilitran Corp.

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