[ILUG] Dell PERCs and Linux

[David Murphy]

Quoting <Pine.LNX.4.21.0006160055550.5791-100000 at fogarty.jakma.org>
by Paul Jakma <paul at clubi.ie>:

> On Thu, 15 Jun 2000, David Murphy wrote:
> 
> > You can have something that's relatively (fast, safe, cheap), pick any
> > two. RAID5 is relatively safe and cheap. It's not relatively fast.
> 
> ok... here's a benchmark:
> 
>               -------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
>           400  1798 87.1  5384 11.0  3188 15.9  1582 85.2 14076 25.0 181.2  4.1
> 
> this is on a 200MHz K6 machine, 128MB RAM, old DAC960-PDU controller
> (25MHz i960CF, 4MB RAM, 3x NCR 53c870 embedded uw scsi controller -
> ie one of of the early UW controllers). 64KB stripe, 8KB chunks,

How does that prove RAID5 is relatively fast, if you don't post RAID1
results on the same hardware?

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