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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Rémy Beaumont <remyb@medrium.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: High load and iowait but no disk access
Date: Tue, 30 Aug 2005 12:15:51 -0400
Message-ID: <22417.1125418551@sss.pgh.pa.us> (raw)
In-Reply-To: <bcd92b00545ffeef542f68666144099d@medrium.com>
References: <bcd92b00545ffeef542f68666144099d@medrium.com>

=?ISO-8859-1?Q?R=E9my_Beaumont?= <remyb@medrium.com> 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

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