W dniu 20.01.2012 01:39, Stan Hoeppner pisze:
On 1/19/2012 5:07 AM, Konrad Rzepecki wrote:
Yes, you have right. But I found recently, that disk mounted on my
server are slow 5.9K. My tests on in shows that they do fsync 1.5x-2x
slower than 7.2K with quite often 5x-10x slower peak. Together with
raid10, lvm, ext4, and much heavier load during delivery it may give
effect I'm observing.
5.9K RPM? Bingo. There's the problem. Those are "green" drives, from
one manufacturer or another, probably Western Digital EARS 2TB drives.
They are not suitable for RAID use, nor server use, nor any high
performance use whatsoever. As you've seen first hand their performance
is low, unpredictable, and unreliable.
I have Seagate Barracude LP 1.5TB drives.
Needless to say, you're not going to get decent queue spooling
performance with these green drives, ever. If you can't wholesale swap
these 8 drives for units suitable for mail server duty, consider
sticking two small inexpensive 7.2k SATA drives in the box and mirroring
them....
This is likely the least expensive way, in both $$ and effort, to solve
your problem.
But, unfortunately, impossible, a last for now. I make, from some time,
changes in my sending software. I hope this workaround will be enough.
Anyway, thanks for your help.
--
Konrad Rzepecki
