lkml.org 
[lkml]   [2008]   [Mar]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: RAID-1 performance under 2.4 and 2.6
On Tue, Mar 25, 2008 at 7:43 PM, Emmanuel Florac <eflorac@intellique.com> wrote:
>
> dd if=/dev/zero of=/mountpoint/testfile bs=1M count=1024

Keep in mind that the above test tests two subsystems at the same
time: RAID-1 + the filesystem on top of it. If you want to test RAID-1
performance you should specify a raw device to of=... instead of a
file (and the direct I/O flags). There are considerable performance
differences between filesystems for large files. E.g. XFS is a lot
faster than ext3 for large files (gigabytes).
Bart.


\
 
 \ /
  Last update: 2008-03-26 09:45    [from the cache]
©2003-2011 Jasper Spaans