Re: What stripe size for mail server?
On Wed, Nov 10, 2004 at 05:29:37PM -0500, Chris Wagner wrote:
> I would say that RAID 5 is probably overkill for a mail queue.
It's not the mail queue. Its the mail store (maildirs). We have no
problems with mail queue performance so far.
> Unless ur
> mail queue is running hundreds of gigabytes and overloading a single disk,
The store is over 60 GB now, and still growing. Will probably reach over
100 GB in a few months.
> normal single hard drive is sufficient.
Definitely not sufficient for us :)
> Based on ur graph it looks like ur
> queue is under half a gig.
What makes you think so? I did mention that those data were just from a
> If you want redundancy for the mail queue then a
> RAID 1 (mirroring) will give u everything u need.
Mirroring seems a little bit to expensive for us. But we will certainly
consider that if someone points me to a comparison that strongly favors
mirroring over RAID5 for a similar setup.
Simply saying that
> RAID 5 is for extremely
> high usage like large file servers and stuff.
is not enough to make the decision, unfortunately.
> Adding RAM to beef up the
> file cache can give u a significant speedup (Ur entire queue can be RAM
Unfortunately adding more system RAM to that machine is not an option
(at least for now). We are going to add more RAM to the controller,
> If u still need RAID 5 then I would make the stripe size equal to
> average file size / number of data disks up to no more than 32KB stripe.
Since avg file size would be something around 2500 bytes, and we have 5
disks, that would give us a 500 byte stripe. I don't think that is even
Marcin Owsiany <email@example.com> http://marcin.owsiany.pl/
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