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Speed up write performance from NAS Linux clients

Upgrading the Linux kernel can make writes much faster on some systems.

Speed up write performance from NAS Linux clients
Rick Cook

There are many ways to improve performance, some of them just having to do with upgrading the software you're using, as this tip suggests. If you have a SAN or a NAS tip, why not send it in? We'll enter you in our tips contest for a nifty prize, and we'll also post it on our Web site.

Are you having sluggish performance with a Linux client system and a NAS filer? Check which version of NFS your Linux client is using. On some Linux-based systems, using the latest version of NFS can significantly increase performance when writing data to the filer.

The reason is that NFS version 2 is usually limited to handling 8 KB of information per request. Since NFS typically issues an acknowledgment after every successful write, there is significant overhead associated with each request. Version 3 of NFS, which is typically found in Linux kernel version 2.2.18 or higher, can handle 32 KB of data per request. This can significantly speed up writing file requests from the clients.

VA Linux discusses this and other NAS tuning issues, some general and some specific to VA NAS products, on its Web site at If you are using a VA Linux client system you can get updates at

About the author: Rick Cook has been writing about mass storage since the days when the term meant an 80K floppy disk. The computers he learned on used ferrite cores and magnetic drums. For the last twenty years he has been a freelance writer specializing in storage and other computer issues.

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Related Book

LINUX, Second Edition: Installation, Configuration and Use
Author : Michael Kofler
Publisher : Addison Wesley
Published : Aug 1999
If you are looking for one book to teach you all the basics of Linux, from installation and usage to simple programming, then this completely revised and updated edition of Linux: Installation, Configuration and Use is the book for you. It will get you up and running with Linux quickly and effectively, cutting out time-consuming installation problems and searches for on-line documentation.

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