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Re: [Linux-cluster] IMAP server clustering ...




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 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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