A few days ago I noticed that NFS performance between a web server node and NFS server went down by 50%. NFS was optimized and the only thing was updated Red Hat kernel v5.2. I also noticed same trend on CentOS 5.2 64 bit edition.
NFS server crashed each and every time web server node tried to store a large file 20-100 MB each. Read performance was fine but write performance went to hell. Finally, I had to rollback the updates. Recently, while reading Red Hat site I came across the solution.
Updated kernel packages that fix various security issues and several bugs are now available for Red Hat Enterprise Linux 5:
* a 50-75% drop in NFS server rewrite performance, compared to Red Hat
Enterprise Linux 4.6, has been resolved.
After upgrading kernel on both server and client my issue resolved:
# yum update
You should follow me on twitter here or grab rss feed to keep track of new changes.
Featured Articles:
- 30 Handy Bash Shell Aliases For Linux / Unix / Mac OS X
- Top 30 Nmap Command Examples For Sys/Network Admins
- 25 PHP Security Best Practices For Sys Admins
- 20 Linux System Monitoring Tools Every SysAdmin Should Know
- 20 Linux Server Hardening Security Tips
- Linux: 20 Iptables Examples For New SysAdmins
- Top 20 OpenSSH Server Best Security Practices
- Top 20 Nginx WebServer Best Security Practices
- 20 Examples: Make Sure Unix / Linux Configuration Files Are Free From Syntax Errors
- 15 Greatest Open Source Terminal Applications Of 2012

- My 10 UNIX Command Line Mistakes
- Top 10 Open Source Web-Based Project Management Software
- Top 5 Email Client For Linux, Mac OS X, and Windows Users
- The Novice Guide To Buying A Linux Laptop






![Red Hat Enterprise Linux 5 IMPORTANT Security Update [ 4-Nov-2008 ]](http://s13.cyberciti.org/images/shared/rp/3/28.jpg)








{ 4 comments… read them below or add one }
Thanks vivek.
If you can post us an article about general Benchmarking and Optimizing NFS that will be very much useful for us.
–
Britto
I second that :)
I’ve been having issues writing to NFS on my Fedora 8 server. Running yum update as I type this. Hopefully this provides a fix.
NFS over TCP is much more faster than UDP