LinuxQuestions.org
Share your knowledge at the LQ Wiki.
Go Back   LinuxQuestions.org > Forums > Linux Forums > Linux - Newbie
User Name
Password
Linux - Newbie This Linux forum is for members that are new to Linux.
Just starting out and have a question? If it is not in the man pages or the how-to's this is the place!

Notices


Reply
  Search this Thread
Old 10-23-2010, 03:57 PM   #1
sashankavrn
LQ Newbie
 
Registered: Oct 2010
Posts: 6

Rep: Reputation: 0
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 04:24 PM.
 
Old 10-23-2010, 03:57 PM   #2
sashankavrn
LQ Newbie
 
Registered: Oct 2010
Posts: 6

Original Poster
Rep: Reputation: 0
access to the NFS-storage system ,read and write options are slow

Last edited by sashankavrn; 10-23-2010 at 04:25 PM.
 
Old 10-23-2010, 04:12 PM   #3
grim76
Member
 
Registered: Jun 2007
Distribution: Debian, SLES, Ubuntu
Posts: 308

Rep: Reputation: 50
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.
 
1 members found this post helpful.
Old 10-23-2010, 04:29 PM   #4
sashankavrn
LQ Newbie
 
Registered: Oct 2010
Posts: 6

Original Poster
Rep: Reputation: 0
Question

read and write is slow and how to diagnos it any commands?
 
Old 10-23-2010, 04:30 PM   #5
sashankavrn
LQ Newbie
 
Registered: Oct 2010
Posts: 6

Original Poster
Rep: Reputation: 0
nfs slow because of read and write how to diagnos it
 
Old 10-23-2010, 05:36 PM   #6
grim76
Member
 
Registered: Jun 2007
Distribution: Debian, SLES, Ubuntu
Posts: 308

Rep: Reputation: 50
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, 06:48 PM   #7
sashankavrn
LQ Newbie
 
Registered: Oct 2010
Posts: 6

Original Poster
Rep: Reputation: 0
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, 08:23 PM   #8
grim76
Member
 
Registered: Jun 2007
Distribution: Debian, SLES, Ubuntu
Posts: 308

Rep: Reputation: 50
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, 07:49 PM   #9
paulsm4
LQ Guru
 
Registered: Mar 2004
Distribution: SusE 8.2
Posts: 5,863
Blog Entries: 1

Rep: Reputation: Disabled
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...
 
  


Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off



Similar Threads
Thread Thread Starter Forum Replies Last Post
[SOLVED] NFS mount fails (times out): NFS server is in DMZ, NFS client is in intranet Hiroshi Linux - Networking 2 05-24-2010 10:22 AM
Linux NFS client <--> Leopard NFS server ACL support tplessers Linux - Networking 0 02-17-2010 04:28 AM
LXer: Run your NFS server in the user address space with NFS-GANESHA LXer Syndicated Linux News 0 11-27-2008 04:40 AM
NFS error: sometimes unable to find the files at NFS-client machines samengr Linux - Server 0 09-01-2008 11:26 AM
NFS client = Linux, NFS server = Mac OS X Tiger --> Hell of a problem make Linux - Networking 9 03-10-2006 05:16 AM

LinuxQuestions.org > Forums > Linux Forums > Linux - Newbie

All times are GMT -5. The time now is 06:22 PM.

Main Menu
Advertisement
My LQ
Write for LQ
LinuxQuestions.org is looking for people interested in writing Editorials, Articles, Reviews, and more. If you'd like to contribute content, let us know.
Main Menu
Syndicate
RSS1  Latest Threads
RSS1  LQ News
Twitter: @linuxquestions
Open Source Consulting | Domain Registration