From: Russell Coker <bofh@coker.com.au>
To: Hans Reiser <reiser@namesys.com>,
Valdis.Kletnieks@vt.edu,
Reiserfs mail-list <Reiserfs-List@Namesys.COM>
Subject: Re: Raid5, LVM and Reiserfs
Date: Mon, 21 Oct 2002 07:51:39 +0200 [thread overview]
Message-ID: <200210210751.39155.bofh@coker.com.au> (raw)
In-Reply-To: <3DB392F6.3000603@namesys.com>
On Mon, 21 Oct 2002 07:39, Hans Reiser wrote:
> >You may wish to verify further. Has the hardware raid controller been
> >identified as being slower than *software* RAID-5? (Remember - if you do
> >it in software, you have to do a disk write per disk). Or is the RAID
> >controller merely "not as fast as other hardware RAID controllers)?
>
> It would be surprising if any hardware RAID controller was as bad as
> software RAID. I agree that measuring is advisable. I would be
> curious to see numbers on something like that.
It's fairly common for low-end RAID hardware to have limitations of memory or
CPU bandwidth that limit the bulk IO rate. Hardware RAID that can only
sustain 10M/s was quite common until very recently.
However such hardware RAID did well on random IO tests, so the result you get
depends on what exactly you do (as usual).
--
http://www.coker.com.au/bonnie++/ Bonnie++ hard drive benchmark
http://www.coker.com.au/postal/ Postal SMTP/POP benchmark
http://www.coker.com.au/projects.html Projects I am working on
http://www.coker.com.au/~russell/ My home page
next prev parent reply other threads:[~2002-10-21 5:51 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-10-18 13:21 Encouraged or discouraged? Object database directly on reiserfs Szabolcs Szasz
2002-10-18 15:07 ` Hans Reiser
2002-10-19 23:47 ` Raid5, LVM and Reiserfs darren
2002-10-20 12:33 ` Lars Marowsky-Bree
2002-10-21 4:49 ` Valdis.Kletnieks
2002-10-21 5:39 ` Hans Reiser
2002-10-21 5:51 ` Russell Coker [this message]
2002-10-21 6:04 ` Hans Reiser
2002-10-21 9:44 ` Russell Coker
2002-10-21 15:44 ` bscott
[not found] <3DB429F2.4090301@eprocess.fr>
2002-10-21 16:30 ` bscott
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=200210210751.39155.bofh@coker.com.au \
--to=bofh@coker.com.au \
--cc=Reiserfs-List@Namesys.COM \
--cc=Valdis.Kletnieks@vt.edu \
--cc=reiser@namesys.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.