Thanks for your response,
I increased the RAM to 2 GB and there is a small increase to improve service.
Based on their comments, I noticed through IOSTAT (% util) the Disk I / O is
high and reaches 100 when using any of these webmail accounts that have more
than 1500 messages
avg-cpu: %user %nice %sys %iowait %idle
52.87 0.00 20.20 17.96 8.98
Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s rkB/s wkB/s avgrq-sz
avgqu-sz await svctm %util
cciss/c0d0 2.01 194.97 58.29 34.67 1861.31 1837.19 930.65 918.59 39.78
1.83 19.82 7.95 73.87
cciss/c0d0p1
0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
0.00 0.00 0.00 0.00
cciss/c0d0p2
0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
0.00 0.00 0.00 0.00
cciss/c0d0p3
2.01 194.97 58.29 34.67 1861.31 1837.19 930.65 918.59 39.78
1.83 19.82 7.95 73.87
avg-cpu: %user %nice %sys %iowait %idle
17.25 0.00 10.50 39.75 32.50
Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s rkB/s wkB/s avgrq-sz
avgqu-sz await svctm %util
cciss/c0d0 5.97 160.20 59.70 41.79 1655.72 1615.92 827.86 807.96 32.24
2.30 20.74 8.06 81.79
cciss/c0d0p1
0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
0.00 0.00 0.00 0.00
cciss/c0d0p2
0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
0.00 0.00 0.00 0.00
cciss/c0d0p3
5.97 160.20 59.70 41.79 1655.72 1615.92 827.86 807.96 32.24
2.30 20.74 8.06 81.79
avg-cpu: %user %nice %sys %iowait %idle
22.31 0.00 7.77 44.36 25.56
Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s rkB/s wkB/s avgrq-sz
avgqu-sz await svctm %util
cciss/c0d0 12.56 0.00 102.01 0.00 2641.21 0.00 1320.60 0.00
25.89 2.92 30.45 9.84 100.35
cciss/c0d0p1
0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
0.00 0.00 0.00 0.00
cciss/c0d0p2
0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
0.00 0.00 0.00 0.00
cciss/c0d0p3
12.56 0.00 102.01 0.00 2641.21 0.00 1320.60 0.00
25.89 2.92 30.45 9.84 100.35
avg-cpu: %user %nice %sys %iowait %idle
49.00 0.00 16.50 22.25 12.25
Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s rkB/s wkB/s avgrq-sz
avgqu-sz await svctm %util
cciss/c0d0 7.96 0.00 289.05 0.00 16756.22 0.00 8378.11 0.00
57.97 2.30 8.02 2.85 82.24
cciss/c0d0p1
0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
0.00 0.00 0.00 0.00
cciss/c0d0p2
0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
0.00 0.00 0.00 0.00
cciss/c0d0p3
7.96 0.00 289.05 0.00 16756.22 0.00 8378.11 0.00
57.97 2.30 8.02 2.85 82.24
The question is whether there is any configuration to EXT3 or Courier-IMAP, and
so do not saturate the Disk I / O. ?
If adding more RAM may I help you?
Thanks
Jolumape
> From: mr...@courier-mta.com
> To: courier-imap@lists.sourceforge.net
> Date: Thu, 4 Jun 2009 20:38:10 -0400
> Subject: Re: [Courier-imap] problem with large mailboxes and sort
>
> Jose Luis Marin Perez writes:
>
> > « HTML content follows »
> > > From: mr...@courier-mta.com
> > > To: courier-imap@lists.sourceforge.net
> > > Date: Wed, 3 Jun 2009 19:26:03 -0400
> > > Subject: Re: [Courier-imap] problem with large mailboxes and sort
> > >
> > > Jose Luis Marin Perez writes:
> > >
> > > > Thanks for your reply.
> > > >
> > > > As discussed, we use Horde Webmail and read the documentation that
> > > > supports server-side sorting, in any event at the Courier-Imap is the
> > way
> > > > to confirm this?
> > >
> > > Disable it, and see if sorting messages is even slower.
> > >
> >
> > Dear Sam,
> >
> > In your experience, think that the problem of slowness is due to the low
> > RAM (1GB) with my server? whereas it has over 4500 email accounts and also
> > have installed Apache + PHP, MySQL, SpamAssassin, ClamAV, etc.?
>
> In my experience it is completely useless to make general statements of this
> nature. Each situation is different. Slow performance symptoms must be
> analyzed individually, by gathering system statistics and determining
> whether the reason for the slow performance is CPU load, or I/O load (which
> may very well be due to paging that results from insufficient RAM).
>
> You will need to run some system statistics and gather some basic data, in
> order to make an informed conclusion.
>
>
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