Large queue and iowait

[Mark Douglas]

Title: Large queue and iowait





I'm having some problems with my qmail server. It seems to be taking an abnormally large amount of time to do queue processing. A recent mailing list send of 250k e-mail's to the server had it stuck in queue processing with iowait at 80-100% the entire time, for over 36 hours. I assume this is not a normal timeframe for processing that amount of e-mail.

The setup is as follows:


Sun Netra t1 - 450mhz ultrasparcII processor
1024MB of memory, 1.5GB of swap
18GB SCSI disk.
Solaris 8
qmail 1.03 with DNS and big-concurrency patch


If any other information is pertinent, please let me know and I'll provide it. Any insight into what the problem could be would be greatly appreciated.

Thanks,


Mark
--
s/root/Mark

Re: Large queue and iowait

[Jake Roersma]

On 2001.07.17 12:47 Mark Douglas wrote:
 I'm having some problems with my qmail server. It seems to be taking an
 abnormally large amount of time to do queue processing. A recent mailing
 list send of 250k e-mail's to the server had it stuck in queue processing
 with iowait at 80-100% the entire time, for over 36 hours. I assume this
 is
 not a normal timeframe for processing that amount of e-mail.
 
 The setup is as follows:
 
 Sun Netra t1 - 450mhz ultrasparcII processor
 1024MB of memory, 1.5GB of swap
 18GB SCSI disk.
 Solaris 8
 qmail 1.03 with DNS and big-concurrency patch
 
 If any other information is pertinent, please let me know and I'll
 provide
 it. Any insight into what the problem could be would be greatly
 appreciated.
 
 Thanks,
 
 Mark
 --
 s/root/Mark
 
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 PFONT SIZE=2I'm having some problems with my qmail server. It seems
 to be taking an abnormally large amount of time to do queue processing. A
 recent mailing list send of 250k e-mail's to the server had it stuck in
 queue processing with iowait at 80-100% the entire time, for over 36
 hours. I assume this is not a quot;normalquot; timeframe for processing
 that amount of e-mail./FONT/P
 
 PFONT SIZE=2The setup is as follows:/FONT
 /P
 
 PFONT SIZE=2Sun Netra t1 - 450mhz ultrasparcII processor/FONT
 BRFONT SIZE=21024MB of memory, 1.5GB of swap/FONT
 BRFONT SIZE=218GB SCSI disk./FONT
 BRFONT SIZE=2Solaris 8/FONT
 BRFONT SIZE=2qmail 1.03 with DNS and big-concurrency patch/FONT
 /P
 
 PFONT SIZE=2If any other information is pertinent, please let me know
 and I'll provide it. Any insight into what the problem could be would be
 greatly appreciated./FONT/P
 
 PFONT SIZE=2Thanks,/FONT
 /P
 
 PFONT SIZE=2Mark/FONT
 BRFONT SIZE=2--/FONT
 BRFONT SIZE=2s/root/Mark/FONT
 /P
 
 /BODY
 /HTML
 
I would check to see if qmail-send has a defunct process.. You will need to
restart it or restart qmail altogether and make sure there are no stray
proceses that may interfere. I've had multiple instances where the queue
becomes abnormally large because qmail-send is defunct.. It should reload
and you will see preprocessed mails grow until it spits everything out.

-- 
Jake Roersma
Network Engineer
Triton Technologies Inc.
(800)-837-4253/364-8761

Re: Large queue and iowait

[Henning Brauer]

On Tue, Jul 17, 2001 at 12:47:16PM -0400, Mark Douglas wrote:
 Solaris 8
 ^^^
This is your problem.

-- 
* Henning Brauer, [EMAIL PROTECTED], http://www.bsws.de *
* Roedingsmarkt 14, 20459 Hamburg, Germany   *
Unix is very simple, but it takes a genius to understand the simplicity.
(Dennis Ritchie)

RE: Large queue and iowait

[Mark Douglas]

Title: RE: Large queue and iowait







 -Original Message-
 From: Dave Sill [mailto:[EMAIL PROTECTED]]
 Sent: Tuesday, July 17, 2001 13:32
 To: [EMAIL PROTECTED]
 Subject: Re: Large queue and iowait
 
 
 Jake Roersma [EMAIL PROTECTED] wrote:
 
 I would check to see if qmail-send has a defunct process.. 
 You will need to
 restart it or restart qmail altogether and make sure there 
 are no stray
 proceses that may interfere. I've had multiple instances 
 where the queue
 becomes abnormally large because qmail-send is defunct..
 
 That ain't right. qmail-send doesn't doesn't just go defunct. I'd
 suspect a kernel bug. What OS are you using?
 
 -Dave
 


See my original e-mail for this info. (Quick answer: Solaris 8).


Mark