>> Hmm, that is interesting. I have no experience in
>troubleshooting jails, but
>> that server was a pgsql db server (on Gentoo Linux) prior to
>being borg, and
>> has been very quick under heavy loads without any I/O issues.
>
>I just removed svr2 as being a relay point for outgoing list
>emails ...
>looking at iostat 5 on that machine, the CPU was wrong close
>to 0 idle,
>whereas now seems to be closer to 100 ... might have been throwing too
>much into the works ;(
>
>Does that make a difference for anyone?
It *feels* a bit faster, but I don't have the time to run an actual
mirror test script to check right now (will try to do that later). And
mail relaying in general tends to load up the I/O quite a bit (lots of
small syncs in different areas of the disk)
I'm not sure what kind of hardware it's on. I did the following totally
unscientific benchmark to get a quick figure. The comparison box is a
three years old HP Proliant DL360 with 512Mb RAM and a RAID-1 disk set,
that's loaded with a whole bunch of I/O intensive stuff (like mail
relaying for about 20,000 users, several web hosts, some db etc). it
runs linux 2.4.30 with an ext3 filesystem (totally untuned).
Reference box:
real 0m21.318s
user 0m6.160s
sys 0m17.270s
borg:
real 0m25.795s
user 0m2.318s
sys 0m20.453s
svr2:
real 0m33.068s
user 0m2.226s
sys 0m21.130s
From this test it seems the jail has some overhead, around 20-25%. Not
sure how to read the difference witht he reference box considering I
don't know what hw is in Borg :) But as I said, it does *seem* a lot
snappier now.
//Magnus
