Latest LQ Deal: Complete CCNA, CCNP & Red Hat Certification Training Bundle
Go Back > Forums > Linux Forums > Linux - General
User Name
Linux - General This Linux forum is for general Linux questions and discussion.
If it is Linux Related and doesn't seem to fit in any other forum then this is the place.


  Search this Thread
Old 09-22-2004, 03:11 PM   #1
LQ Newbie
Registered: Jun 2002
Location: NH
Distribution: Kubuntu
Posts: 24

Rep: Reputation: 15
Raw devices

I'm currently getting poor I/O performance accessing an external raid storage array with both reads and writes. However from a windows machine the numbers are great it is my belief that the Linux 2.6 kernel is bottlenecking the I/O. Currently I run Fedora Core 2 with a qla2200f HBA using the qla2xxx.ko and qla2200.ko driver modules. The machine is a 64bit athalon with 512mb of ram, connected to a 4TB storage array. I am hoping to bypass the kernel buffer and read/write directly to the raw device I've read this can be done but can't find any info on how to do it. Any input would be greatly appreciated.


Old 09-22-2004, 08:38 PM   #2
Registered: Apr 2002
Location: in a fallen world
Distribution: slackware by choice, others too :} ... android.
Posts: 23,066
Blog Entries: 11

Rep: Reputation: 910Reputation: 910Reputation: 910Reputation: 910Reputation: 910Reputation: 910Reputation: 910Reputation: 910
How does it work with a 2.4 kernel?
And what kind of figures are we looking at,
quantising it ... factor in the comparison between
Linux and winDOHs? And how do you know
that it's not the machine but the OS if windows
in on another machine?

Old 09-23-2004, 02:01 PM   #3
LQ Newbie
Registered: Jun 2002
Location: NH
Distribution: Kubuntu
Posts: 24

Original Poster
Rep: Reputation: 15
Uh, Yeah I saw those qustionstions coming but I didn't(and still don't) have the numbers in front of me I'll have to get you on that.


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 On
HTML code is Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Require Raw devices on FC3 - New to Linux mikeh7519 Fedora 0 11-10-2005 06:36 PM
assigning raw devices: error when going to init3 GlennsPref Mandriva 1 11-25-2004 09:03 PM
UDEV and Raw devices swissworks Slackware 6 09-14-2004 01:08 PM
HD to HD raw copy with dd? mmx87 Linux - Hardware 1 09-10-2004 12:01 PM
Raw Devices rajar11 Linux - Newbie 4 06-16-2004 01:36 PM

All times are GMT -5. The time now is 10:54 AM.

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