Fred Ho:
> Hi,
>
> I found there're quite a lot of cleanup processes running and found
> that the incoming mails are still being spooled to
> /var/spool/postfix/incoming which started hours ago.
>
> May I ask why the spooling is taking so long? Is it the network? Thanks.
You haven't even tried to find out if it is CPU bound, memory
exhaustion, or disk overload?
1) It's CPU bound because of many header_checks or body_checks. Use
a content filter instead.
2) It's I/O bound because of a slow file system, slow disk drive,
bad RAID implementation (parity blocks but no battery-backed write
buffer), or a slow file server.
3) It's low on memory causing the system to swap.
Recently a colleague of mine found a troubling failure mode where
disks would silenty retry bad blocks without ever reporting an
error. This was slowing down write performance by a huge factor.
Look for recoverable errors in your SMART logs.
Wietse
