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I'm currently running a mail server (qmail) which seems to have a very high load average. I want to try and find where the bottleneck is (I suspect disk I/O, although I'm running RAID)
The server is a Dual Pentium III 1.2Ghtz w/ 1gb RAM and 3 x 36gb 10k SCSI drives in RAID 5. The disks are formatted as ext3, I'm wondering if XFS / JFS / ReiserFS may be more suitable for this task...?
There is still 32mb RAM free, and the CPU's are generally idling. The only other thing I can think of is disk I/O. Can anyone help me with how to find what's causing the bottleneck?
1.19 is not a very high load average. I haven't had my email server stop sending until the load gets over 12.0. Even then, I've seen figures over 32.0 and the box hasn't crashed - I've just had to manually kill some processes.
Unless you have a very low throughput or errors in your mail logs, I wouldn't be worried by the load averages you've posted.
I've managed to get servers to a load average of the low 70's before without crashing :P
I'm not getting errors or anything, but the same server is running apache with SquirrelMail for my users, and with the high L/A apache is getting unresponsive... Perhaps renice'ing apache might help?
I don't really want to give apache priority over mail though to all the lovely people who like to scan the host for vulnerabilities etc...
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