Re: Mass Mailout Performance Tips

[Eric Cox]

[EMAIL PROTECTED] wrote:
> 
> > Are you using multiple spindes? Can I recommend that you do.
> 
> Do you mean separate hard disks for the queue? .. The queue resides
> on a RAID5 hardware controlled array.
> 

I seem to remember someone saying that RAID5 is exactly the wrong kind 
of RAID for a mail queue.  As I understand it, RAID5 does read of the 
same sector(?) of all spindles, recalculates parity, then a write back 
to all (only one?) spindles.  This would be quite a write penalty if 
the RAID controller honored fsync's.

You might want to check the archives for it because my feeble memory 
may be fooling me, but I've seen lots of people recommend RAID1+0 for 
mail queues.

Eric