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Old 09-20-2011, 01:19 PM   #1
robwicks
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Registered: Mar 2007
Location: Atlanta, GA
Distribution: RHEL, CentOS, Ubuntu
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NFS client performance differs by mount point


I have an odd situation. I have a Linux server with an NFS mount over TCP to a NetApp filer. There are various application logging to the /logs mount point, which is where the filer is mounted. lsof /logs shows 250 things are open (exactly 250, if that is significant). When I mount the exact same volume to a temporary directory at the exact same time, my read performance goes from 70KB/s or so to 150+MB/s. A huge, huge difference. I'm at a loss as to why. Do any of you have any ideas?
 
Old 09-21-2011, 07:17 AM   #2
mr51m0n
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Registered: Nov 2008
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Hey robwicks

Can you provide some more infos, e.g. the output of
Code:
mount
in both situations (mounted on /var and mounted on other directory) and the content of /etc/fstab?

mr51m0n
 
Old 09-21-2011, 07:56 AM   #3
jason_not
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Registered: Aug 2010
Location: Beaverton, Oregon, USA
Distribution: Pfsense, Ubuntu, Centos, Fedora, Redhat, Scientfic, MacOS
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Hi,

When you have the volume mounted on the temporary mount point, are all of the applications logging to it? I expect with so many programs having open files when it's your /log mount point, that you simply have a limited remaining bandwidth to the disk. The question that mr51m0n asked is relevant, in that the mount options can make a difference. But to really compare the two mount points, you must also reproduce all of the traffic.

--jason
 
  


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