On 6 Sep 2012, at 10:21, Nigel Metheringham <[email protected]>
 wrote:

> Exim puts mail through an on-disk queue, and, obeying the appropriate
> RFCs, takes great care to make sure that received mail is committed to
> stable storage before acknowledging receipt or attempting further
> delivery - this tends to require round trips, not just to the disk
> controller, but right down to the spinning rust, so will limit
> performance, whilst enhancing reliability.

Of course SSDs, flash storage, and ram disks are also available. Using them 
will improve performance. RAM disks, though, will risk message loss.


-- 
Ian Eiloart
Postmaster, University of Sussex
+44 (0) 1273 87-3148


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