[Dovecot] hunting timeouts
Hi guys,
I inherited a Dovecot 1.0.1, which I will have to upgrade, but until then I need, if possible, to resolve a timeout.
- we have about 25 IMAP users
- the busiest user has about 100 000 messages (Maildir) in less than 100 folders
- the mail server is on HP server with server grade 2.5" HDDs in RAID 5
- the load average of the server is low (the 5/15 minute is under 0.20)
- the mail server is in-house on Gigabit Ethernet
The timeout we face is that sometimes even small messages take 20-40 seconds to open (i. e. Tunderbird 2 on Windows 7). Or connection to the mail server timeouts.
Could you give me a few tips where can I look in order to detect the possible reason for these timeouts.
Thank you, Iv
On Thu, 2010-08-12 at 14:28 +0200, Iv Ray wrote:
The timeout we face is that sometimes even small messages take 20-40 seconds to open (i. e. Tunderbird 2 on Windows 7). Or connection to the mail server timeouts.
Could you give me a few tips where can I look in order to detect the possible reason for these timeouts.
Have you looked at if during the 20-40 seconds the disk I/O is high? If the problem is on server and not on network, it might be helpful to strace the process that's taking a long time to reply. Then it could show if it's mainly waiting for some system call to finish. http://wiki.dovecot.org/Debugging/ProcessTracing
On 12.08.2010, at 14:59, Timo Sirainen wrote:
Have you looked at if during the 20-40 seconds the disk I/O is high? If the problem is on server and not on network, it might be helpful to strace the process that's taking a long time to reply. Then it could show if it's mainly waiting for some system call to finish. http://wiki.dovecot.org/Debugging/ProcessTracing
Thank you, I'll check that.
Iv
participants (2)
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Iv Ray
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Timo Sirainen