From mboxrd@z Thu Jan 1 00:00:00 1970 From: "H. Peter Anvin" Subject: Bonnie numbers for RAID-6 Date: 26 Dec 2003 22:59:14 -0800 Sender: linux-raid-owner@vger.kernel.org Message-ID: Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7BIT Return-path: To: linux-raid@vger.kernel.org List-Id: linux-raid.ids 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 -- at work, 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