From: "H. Peter Anvin" <hpa@zytor.com>
To: linux-raid@vger.kernel.org
Subject: Bonnie numbers for RAID-6
Date: 26 Dec 2003 22:59:14 -0800 [thread overview]
Message-ID: <bsjak2$b2t$1@cesium.transmeta.com> (raw)
Some quick Bonnie numbers run on the RAID-6 code. The machine has one
P4/1.8 CPU and 512 MB RAM; the file size was 1024 MB and the filesystem a
"virgin" ext3. Each partition was 10 GB; each disk is a 40 GB ATA/100
drive. The stripe size was 256 KB.
I suspect RAID-6 write performance should be possible to improve;
currently it doesn't do read-modify-write for the syndrome drives, for
example.
RAID-6 across 6 disks:
-------Sequential Output-------- ---Sequential Input-- --Random--
-Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks---
Machine MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec %CPU
1024 4579 95.7 21733 8.4 10993 4.1 4483 93.8 28751 6.5 331.5 3.0
RAID-5 across 5 disks (same capacity):
-------Sequential Output-------- ---Sequential Input-- --Random--
-Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks---
Machine MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec %CPU
1024 4622 96.4 56730 23.5 17249 6.4 4651 97.4 29761 6.1 322.4 2.8
RAID-5 across 6 disks:
-------Sequential Output-------- ---Sequential Input-- --Random--
-Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks---
Machine MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec %CPU
1024 4597 96.0 28771 11.2 12890 4.7 4558 95.4 29133 6.5 344.3 3.0
Single disk:
-------Sequential Output-------- ---Sequential Input-- --Random--
-Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks---
Machine MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec %CPU
1024 4738 98.8 33435 14.2 16157 5.9 4718 97.7 34268 4.3 151.3 0.7
--
<hpa@transmeta.com> at work, <hpa@zytor.com> in private!
If you send me mail in HTML format I will assume it's spam.
"Unix gives you enough rope to shoot yourself in the foot."
Architectures needed: ia64 m68k mips64 ppc ppc64 s390 s390x sh v850 x86-64
reply other threads:[~2003-12-27 6:59 UTC|newest]
Thread overview: [no followups] expand[flat|nested] mbox.gz Atom feed
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='bsjak2$b2t$1@cesium.transmeta.com' \
--to=hpa@zytor.com \
--cc=linux-raid@vger.kernel.org \
/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.