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SubjectRe: Volume Managers in Linux
From
Date
Shawn Leas <sleas@ixion.honeywell.com> writes:

> On Tue, 3 Nov 1998, Albert D. Cahalan wrote:
>
> > > Wouldn't you like to push all that crap out to userspace?
> >
> > If you are serious about RAID in userspace, go away. I'll assume you
> > didn't really mean to type that.
>
> Well... Software RAID performance suxorz anyway, but I absolutely

Really?

Pentium 166MMX 64 MB RAID M2954ESP + WDC AC22000L (raid0 + 4k fs block)

-------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
200 7277 95.0 16207 63.3 6473 51.9 6276 78.8 12670 40.5 155.0 4.8
^^^^^ ^^^^ ^^^^^ ^^^^^
Pentium 166MMX 64 MB + SCSI Fujitsu M2954ESP 4GB

-------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
200 6491 89.3 7803 32.5 2759 23.0 5972 79.0 7111 24.5 92.2 3.5
Pentium 166MMX 64 MB + UDMA WDC AC22000L 2GB

-------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
200 6199 88.7 7224 32.6 2559 22.0 6048 80.5 7117 25.4 65.5 2.1

Next time you could test things before you preach. :)

Regards,
--
Posted by Zlatko Calusic E-mail: <Zlatko.Calusic@CARNet.hr>
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