Re: RAID-1 performance under 2.4 and 2.6

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From: Bart Van Assche <bart.vanassche@...>

To: Emmanuel Florac <eflorac@...>

Cc: <linux-kernel@...>

Subject: Re: RAID-1 performance under 2.4 and 2.6

Date: Wednesday, March 26, 2008 - 4:42 am

On Tue, Mar 25, 2008 at 7:43 PM, Emmanuel Florac <eflorac@intellique.com> wrote:
quoted text>
>  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.
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Messages in current thread:

RAID-1 performance under 2.4 and 2.6, Emmanuel Florac, (Tue Mar 25, 2:43 pm)

Re: RAID-1 performance under 2.4 and 2.6, Bart Van Assche, (Wed Mar 26, 4:42 am)

Re: RAID-1 performance under 2.4 and 2.6, Emmanuel Florac, (Wed Mar 26, 7:07 am)

Re: RAID-1 performance under 2.4 and 2.6, Bart Van Assche, (Wed Mar 26, 7:15 am)

Re: RAID-1 performance under 2.4 and 2.6, Emmanuel Florac, (Wed Mar 26, 8:36 am)

Re: RAID-1 performance under 2.4 and 2.6, Bill Davidsen, (Thu Mar 27, 6:03 pm)

Re: RAID-1 performance under 2.4 and 2.6, Bart Van Assche, (Wed Mar 26, 9:22 am)

Re: RAID-1 performance under 2.4 and 2.6, Bill Davidsen, (Tue Mar 25, 6:37 pm)

Re: RAID-1 performance under 2.4 and 2.6, Chris Snook, (Tue Mar 25, 6:00 pm)

Re: RAID-1 performance under 2.4 and 2.6, Bart Van Assche, (Wed Mar 26, 3:15 am)

Re: RAID-1 performance under 2.4 and 2.6, Bill Davidsen, (Thu Mar 27, 5:53 pm)

Re: RAID-1 performance under 2.4 and 2.6, Bart Van Assche, (Fri Mar 28, 3:44 am)

Re: RAID-1 performance under 2.4 and 2.6, Bill Davidsen, (Fri Mar 28, 8:04 am)

Re: RAID-1 performance under 2.4 and 2.6, Emmanuel Florac, (Wed Mar 26, 3:56 am)

Re: RAID-1 performance under 2.4 and 2.6, Bill Davidsen, (Tue Mar 25, 6:47 pm)

Re: RAID-1 performance under 2.4 and 2.6, Chris Snook, (Tue Mar 25, 7:13 pm)

Re: RAID-1 performance under 2.4 and 2.6, Pádraig Brady, (Wed Jul 16, 10:52 am)

Re: RAID-1 performance under 2.4 and 2.6, Chris Snook, (Wed Jul 16, 2:18 pm)

Re: RAID-1 performance under 2.4 and 2.6, Bill Davidsen, (Tue Mar 25, 7:42 pm)

Re: RAID-1 performance under 2.4 and 2.6, Chris Snook, (Wed Mar 26, 12:39 pm)

Re: RAID-1 performance under 2.4 and 2.6, Emmanuel Florac, (Wed Mar 26, 4:05 am)

Re: RAID-1 performance under 2.4 and 2.6, Chris Snook, (Wed Mar 26, 12:51 pm)

Re: RAID-1 performance under 2.4 and 2.6, "J.A. Magallón", (Wed Mar 26, 4:25 am)

Re: RAID-1 performance under 2.4 and 2.6, Bill Davidsen, (Thu Mar 27, 5:49 pm)

Re: RAID-1 performance under 2.4 and 2.6, Emmanuel Florac, (Tue Mar 25, 6:09 pm)


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