Ken Murchison wrote:
Robert Mueller wrote:
Just reviving an old issue to see if anyone has any more information.
http://asg.web.cmu.edu/archive/message.php?mailbox=archive.cyrus-devel&msg=1072
We still see this every now and then, most often with seen state
databases. It's most often after an unclean shutdown, but I've seen
it at other times as well. Has anyone got any more ideas on what
might be causing this?
We haven't seen this locally, so it hasn't risen to the top of my
queue yet.
We've seen corruption caused by 2 diferent sources:
- fail on allocation of memory: linux can negate mmap's with plenty of
memory free. There was a patch to use remap instead of unmap / mmap
again, but we never tested it;
- there is some sort of race, that shows up in (real) smp boxes (dont
count HT in smp);
We "solved" it by a) adding memory (now our mupdate server has 4G) and
b) using an UP linux kernel. Wimpy, but worked. After that "solutions"
we hasnt seen a corruption for almost an year.
To put things in perspective:
[EMAIL PROTECTED] ~]# /usr/lib/cyrus-imapd/ctl_mboxlist -d | wc -l
4599957
[EMAIL PROTECTED] ~]# free
total used free shared buffers cached
Mem: 3980680 3127804 852876 0 85612 2767608
-/+ buffers/cache: 274584 3706096
Swap: 2096472 144 2096328
--
Sergio Bruder
Haxent Consultoria
