Re: High load and iowait but no disk access

From: Tom Lane
Subject: Re: High load and iowait but no disk access
Date: ,
Msg-id: 22417.1125418551@sss.pgh.pa.us
(view: Whole thread, Raw)
In response to: High load and iowait but no disk access  (Rémy Beaumont)
List: pgsql-performance

Tree view

High load and iowait but no disk access  (Rémy Beaumont, )
 Re: High load and iowait but no disk access  (Rémy Beaumont, )
  Re: High load and iowait but no disk access  (Tom Lane, )
   Re: High load and iowait but no disk access  (Rémy Beaumont, )
 Re: High load and iowait but no disk access  (Michael Stone, )
 Re: High load and iowait but no disk access  (Tom Lane, )
 Re: High load and iowait but no disk access  (Josh Berkus, )
  Re: High load and iowait but no disk access  (Rémy Beaumont, )
 Re: High load and iowait but no disk access  ("Woody Woodring", )
 Re: High load and iowait but no disk access  (Rémy Beaumont, )
 Re: High load and iowait but no disk access  ("Anjan Dave", )
  Re: High load and iowait but no disk access  (, )

=?ISO-8859-1?Q?R=E9my_Beaumont?= <> writes:
> The stats of the NetApp do confirm that it is sitting idle.

Really?

>   CPU   NFS  CIFS  HTTP   Total    Net kB/s   Disk kB/s     Tape kB/s
> Cache Cache  CP   CP Disk   DAFS   FCP iSCSI   FCP  kB/s
>                                    in   out   read  write  read write
> age   hit time  ty util                       in   out
>    2%     0     0     0     139     0     0   2788      0     0     0
>   3   96%   0%  -   15%      0   139     0     3  2277
>    2%     0     0     0     144     0     0   2504      0     0     0
>   3   96%   0%  -   18%      0   144     0     3  2150
>    2%     0     0     0     130     0     0   2212      0     0     0
>   3   96%   0%  -   13%      0   130     0     3  1879
>    3%     0     0     0     169     0     0   2937     80     0     0
>   3   96%   0%  -   13%      0   169     0     4  2718
>    2%     0     0     0     139     0     0   2448      0     0     0
>   3   96%   0%  -   12%      0   139     0     3  2096

I know zip about NetApps, but doesn't the 8th column indicate pretty
steady disk reads?

            regards, tom lane


pgsql-performance by date:

From: Ralph Mason
Date:
Subject: 'Real' auto vacuum?
From: mark@mark.mielke.cc
Date:
Subject: Re: 'Real' auto vacuum?