High Load average no CPU utilization

adam fisher afisher at circlepix.com
Wed Mar 28 14:34:23 MDT 2007


I appreciate everybody's thoughts on this.

I agree that the NFS looks to be the bottle neck however we have 5 other load balanced web servers that are pulling the web data from our NFS server.  We mount the partition and then created sym links to those mounts.  The other 5 web boxes are up and running fine.  It is the sixth alone that is having this issue.

The first 5 are BSD this is a Fedora installation as we want to get away from BSD.  

Any other ideas?

thanks,
Adam


----- Ryan Simpkins <plug at ryansimpkins.com> wrote:
> On Wed, March 28, 2007 11:44, adam fisher wrote:
> > apache   17268  0.7  0.6  29552 12868 ?        D    04:27   0:04
> /usr/sbin/httpd
> > apache   17456  1.1  0.6  29728 13168 ?        S    04:27   0:06
> /usr/sbin/httpd
> > apache   17890  0.5  0.6  29928 12588 ?        D    04:28   0:02
> /usr/sbin/httpd
> > apache   17893  0.0  0.5  29032 11548 ?        D    04:28   0:00
> /usr/sbin/httpd
> > apache   17895  0.0  0.5  29184 11716 ?        D    04:28   0:00
> /usr/sbin/httpd
> > apache   17896  0.0  0.5  28740 11256 ?        D    04:28   0:00
> /usr/sbin/httpd
> > apache   17897  0.0  0.5  28912 11452 ?        D    04:28   0:00
> /usr/sbin/httpd
> > apache   17904  0.3  0.5  29288 11876 ?        D    04:28   0:01
> /usr/sbin/httpd
> > apache   17913  0.5  0.5  29316 11892 ?        D    04:29   0:02
> /usr/sbin/httpd
> > apache   17923  0.1  0.5  29364 12052 ?        D    04:29   0:00
> /usr/sbin/httpd
> 
> > Device:         rrqm/s   wrqm/s   r/s   w/s   rsec/s   wsec/s
> avgrq-sz avgqu-sz
> > await  svctm  %util
> > sda               0.00    11.00  0.00  6.00     0.00   136.00   
> 22.67     0.00
> > 0.50   0.17   0.10
> 
> > The web root is located on an NFS share.  I restarted NFS on this
> box just to make
> > sure.  When I restart httpd and the load average drops to around 10
> or 11 I can
> > browse the webpage just fine.  It is when it gets to around 150 that
> I can't.
> >
> 
> Bingo. Your web root is running over NFS. NFS is pure evil for this
> type of work.
> You may be able to improve performance playing around with the various
> NFS mount
> options.
> 
> -Ryan
> 
> /*
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-- 
Adam Fisher
IT Coordinator
CirclePix
801-318-4585 ext.6603
1-877-390-6630 ext.6603




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