Red Hat Bugzilla – Bug 105935
remote NFS server failures cause high load on clients
Last modified: 2007-04-18 12:58:00 EDT
We have 20 Linux clients mounting 7 NFS servers(3 Netapp, 4 Auspex) using the
following mounting options:
nfs6-e9c:/vol/vol0/qvol1 on /epdata21 type nfs
If one of these remote NFS servers goes down, the local clients load average
gets extemely high (~200) and becomes unresponsive. We have a propietery
application that searches and retrieves from NFS, but we have also been able to
reproduce using a simple 'cat' script. (see reproducable section)
We also have Solaris clients that do the same kindof work and when an NFS
server goes down the load average is unaffected unlike Red Hat Linux.
Version-Release number of selected component (if applicable):
I will attach the simple cat script to next section.
Steps to Reproduce:
1. Mount an NFS server
2. Fail NFS server(Down NIC card on server)
3. Run script
High load averages, eventaully leading to unresponesive NFS client.
Load average should not go high and should act similarly to other Unix
Platforms like Solaris
Created attachment 94825 [details]
Script to create high load on Linux Client
This is a script that will create a high load on Linux Client after an NFS
"/epdata21/DO_NOT_DELETE_READ_TEST/read.test.DO.NOT.DELETE" is a flat text file
on a remote NFS server file system.
Thanks for the bug report. However, Red Hat no longer maintains this version of
the product. Please upgrade to the latest version and open a new bug if the problem
The Fedora Legacy project (http://fedoralegacy.org/) maintains some older releases,
and if you believe this bug is interesting to them, please report the problem in
the bug tracker at: http://bugzilla.fedora.us/