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Old 10-23-2010, 04:57 PM   #1
sashankavrn
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Question nfs


Read/writes are slow on NFS.How can we diagnosing the issue, what commands are used for the error finding

Last edited by sashankavrn; 10-23-2010 at 05:24 PM.
 
Old 10-23-2010, 04:57 PM   #2
sashankavrn
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access to the NFS-storage system ,read and write options are slow

Last edited by sashankavrn; 10-23-2010 at 05:25 PM.
 
Old 10-23-2010, 05:12 PM   #3
grim76
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There are several factors that can contribute to NFS slowness:

Network issues
Number of NFS Daemons
RAM
Processor
Mount parameters
Network tuning of both the client and host

I know on the NFS mounts that I have done in the past I have specified several options to increase performance.

The link below helped me to understand some of the options:
http://nfs.sourceforge.net/nfs-howto/ar01s05.html

Also take a look at network tuning both the client and server via sysctl also.
 
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Old 10-23-2010, 05:29 PM   #4
sashankavrn
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read and write is slow and how to diagnos it any commands?
 
Old 10-23-2010, 05:30 PM   #5
sashankavrn
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nfs slow because of read and write how to diagnos it
 
Old 10-23-2010, 06:36 PM   #6
grim76
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Ok you are going to have to do better than that:

How is the current NFS mount mounted?
What are your system specs for the NFS server?
Are other functions of the NFS server slow?
Are small file transfers slow?
Are large file transfers slow?

Help us help you.
 
Old 10-23-2010, 07:48 PM   #7
sashankavrn
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A RedHat server has storage from a network-attached storage array mounted over NFS. Read/writes to this mount are slow. How would you go about diagnosing the issue, what commands would you use and why? If you had access to the NFS-storage system what general things could you check for here?
 
Old 10-23-2010, 09:23 PM   #8
grim76
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You still have not answered all the questions that have been asked.

New questions:

What type of network storage? (iSCSI, FC, etc......)
Are you making an NFS server from another NFS server (Mounting and NFS location and sharing it back out as an NFS location)?
 
Old 10-24-2010, 08:49 PM   #9
paulsm4
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Hi, all -

Quote:
A RedHat server has storage from a network-attached storage array mounted over NFS. Read/writes to this mount are slow. How would you go about diagnosing the issue, what commands would you use and why? If you had access to the NFS-storage system what general things could you check for here?
This is an "exam cram" question (i.e. "homework"). I don't believe the OP doesn't really has a RedHat server; I don't think there's actually any performance issue. He's just looking for a stock answer to a test question.

sashankavrn -

In the real world, "facts" that you can "memorize" are FAR less important than "concepts" that you "learn". If you haven't already done so, I strongly urge you to get ahold of a Linux system (and, perhaps, a JBoss server) and experiment with them.

IMHO...
 
  


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