What Bonnie's benchmark should we expect for RAID 0+1

From: Xie, Tom <TXie_at_taylorpub.com>
Date: Thu, 19 Dec 2002 08:09:14 -0800
Message-ID: <F001.0051E595.20021219080914@fatcity.com>

Hello,

We have a Compaq AlphaServer 8400 with 8 GB RAM, 8 dual 625mhz CPUs and two HSZ70 Array Controllers. Each Controller is connected to 24 36GB 10K rpm Ultr SCSI disk divers. In the system, some volums are configured as RAID 1, and the others are configured as RAID 0+1 with 3 striping. However, we can't see significant performance improvement in RAID 0+1 volums except random seek. The following are the Bonnie's benchmarks for two kinds of volums:

For RAID 1:

              -------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
RAID1 1024 9029 55.1 9108 14.3 8956 15.6 15700 89.4 115531 99.9 2535.2 65.9

For RAID 0+1:

              -------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
RAID01 1024 9780 58.8 9872 17.1 14067 25.7 15990 89.7 56037 59.5 5374.3 169.9

Is there something wrong? What Bonnie's benchmark should we expect for RAID 0+1?

Thanks,
Tom
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Author: Xie, Tom
  INET: TXie_at_taylorpub.com

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