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Old 10-24-2012, 02:41 AM   #1
frenchviking
LQ Newbie
 
Registered: May 2012
Posts: 11

Rep: Reputation: Disabled
NFS clients regular high getattr


Hello,

Since last Friday I experience a regular high rate of getattr from two of my NFS clients. This look like this:

graph_image.png

On both servers Cacti reports the same stats.
I have no idea where it come from, but while searching for an answer, I found that the syslogd process had a high i/o wait, around 80%. So I did a strace of the process and noticed the following, non stop lightning speed occurring.

strace.JPG

When I kill the syslogd, the i/o wait disappear but not my getattr rate.


The NFS server stats are the following :

Code:
Server nfs v3:
null         getattr      setattr      lookup       access       readlink
152       0% 1783936589 55% 35924507  1% 259828607  8% 526889444 16% 8332      0%
One the clients:

#1
Code:
Client nfs v3:
null         getattr      setattr      lookup       access       readlink
0         0% 25779368 52% 512655    1% 5714549  11% 6687009  13% 234       0%
#2
Code:
Client nfs v3:
null         getattr      setattr      lookup       access       readlink
0         0% 27243070 53% 107335    0% 7549252  14% 7989644  15% 476       0%
Those two clients are Apache webservers under RedHat Enterprise Linux 5.8 with NFS mount on another RHEL machine.

Thank you.

Last edited by frenchviking; 10-24-2012 at 03:38 AM. Reason: Solved
 
Old 10-24-2012, 03:23 AM   #2
frenchviking
LQ Newbie
 
Registered: May 2012
Posts: 11

Original Poster
Rep: Reputation: Disabled
Solved. Last friday someone installed an Apache management pack for SCOM. Stopping the agent on the servers and the getattr rate collapse!

And dumb me forgetting to deactivate the sysctl nfs debug !

Last edited by frenchviking; 10-24-2012 at 03:37 AM.
 
  


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