|Summary:||Poor NFS performance with netapp filer|
|Product:||Red Hat Enterprise Linux 3||Reporter:||Peter Schauer <schauer>|
|Component:||kernel||Assignee:||Steve Dickson <steved>|
|Status:||CLOSED WONTFIX||QA Contact:||Brian Brock <bbrock>|
|Version:||3.0||CC:||dhoward, petrides, riel|
|Fixed In Version:||Doc Type:||Bug Fix|
|Doc Text:||Story Points:||---|
|Last Closed:||2007-10-19 19:30:16 UTC||Type:||---|
|oVirt Team:||---||RHEL 7.3 requirements from Atomic Host:|
Description Peter Schauer 2004-02-10 10:53:34 UTC
From Bugzilla Helper: User-Agent: Mozilla/5.0 (X11; U; SunOS i86pc; en-US; rv:1.3) Gecko/20030402 Description of problem: This is a IBM eserver 325, running RHEL 3 AMD64, connected to a netapp F720 filer. The eserver is connected via a 100MB link to a switch, which is connected via a GB FC to the netapp. We are using autofs with NIS to mount directories from the filer. RHEL 3 seems to default to use a rsize/wsize of 32768 with UDP with the netapp, which results in very poor performance with many nfsstat -c retrans errors. Using TCP or a rsize/wsize of 4096 fixes the performance problems, but we cannot change the autofs maps as we are running in a heterogenous environment, where we cannot force these parameters for other hosts on the network (some can't do TCP, for many a rsize/wsize of 4096 is contraproductive, and the options syntax is different for Linux and Solaris clients). Currently we work around the problem by using a local file copy of the auto.master map which we hack to use TCP, but this is not a long term solution. Older versions of RedHat kernels (9, 8.0 etc.) and SuSe SLES 8.1 kernels limited the default UPD rsize/wsize to 4096, so they didn't cause the problem. Possible fixes: - Default to use TCP mounts when the NFS server supports them. or - Limit UDP rsize/wsize defaults to 4096 like in older RedHat kernels. Version-Release number of selected component (if applicable): kernel-2.4.21-9.EL How reproducible: Always Steps to Reproduce: 1.Copy file from/to netapp with default mount parameters. 2. 3. Actual Results: Very slow Additional info:
Comment 1 Don Howard 2004-03-01 23:01:06 UTC
Peter, Can you post nfsstat output and a pcap-format packet capture (including nfs fragments) that demonstrates the retransmit behavior?
Comment 2 RHEL Product and Program Management 2007-10-19 19:30:16 UTC
This bug is filed against RHEL 3, which is in maintenance phase. During the maintenance phase, only security errata and select mission critical bug fixes will be released for enterprise products. Since this bug does not meet that criteria, it is now being closed. For more information of the RHEL errata support policy, please visit: http://www.redhat.com/security/updates/errata/ If you feel this bug is indeed mission critical, please contact your support representative. You may be asked to provide detailed information on how this bug is affecting you.