Date: Fri, 11 Aug 2000 10:07:00 -0400 From: Mike Tancsa <mike@sentex.net> To: Mike Smith <msmith@FreeBSD.ORG> Cc: hardware@FreeBSD.ORG Subject: Re: 3ware and RAID0 vs RAID 1 Message-ID: <4.3.2.7.0.20000811092428.00da32d0@marble.sentex.ca> In-Reply-To: <200008102138.OAA01627@mass.osd.bsdi.com> References: <Your message of "Thu, 10 Aug 2000 17:16:38 EDT." <4.3.2.7.0.20000810171454.04748db0@marble.sentex.ca>
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At 02:38 PM 8/10/00 -0700, Mike Smith wrote:
> >
> > >Newfs isn't a representative case with these cards, as newfs doesn't
> > >align the data it writes and the driver has to copy the data around
> > >(expensive). The array itself should still perform pretty well (read
> > >speeds should be pretty good especially).
> >
> > Actually, on a 128M system, it died while doing a 500M bonnie write.. i.e.
> > it just hung there. I will test some more tomorrow when back at the
> office
> > and provide more info.
> >
> > Aug 10 16:16:46 smtp4 /kernel: twed0: <3ware RAID unit> on twe0
> > Aug 10 16:16:46 smtp4 /kernel: twed0: 14323MB (29334784 sectors)
>
>Ok, thanks. It *definitely* shouldn't "just hang" at all.
OK, some more quick testing... I was wrong about the hanging, I just did
not wait long enough.
running bonnie with 100M (the machine has 128M of RAM, both complete in
about 30seconds. Actually, 33 for the 3ware vs 30. Sounds reasonable.
(mounts are sync btw)
-------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
IDE 100 15511 84.5 16221 30.4 17630 33.8 13662 99.9 159587 99.9
17239.3 99.7
RAID1 100 18210 97.4 18148 32.5 19653 36.0 13644 100.0 157095 100.0
17101.5 99.6
But, when I do something over my available RAM, the differences become very
apparent.
-------Sequential Output-------- ---Sequential Input-- --Random--
-Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks---
MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec %CPU
IDE 500 17721 93.8 18197 33.4 8871 21.2 12800 97.5 22265 21.2 153.1 1.9
RAID1 500 14711 81.0 16023 32.0 600 1.4 5805 44.0 6710 6.0 102.2 1.3
Doing a 500MB write on a regular drive on this machine takes about 3min,
30seconds. On the RAID1, it takes 19 min ??
Do you see similar results with your controllers and disks in RAID1 ?
---Mike
------------------------------------------------------------------------
Mike Tancsa, tel +1 519 651 3400
Sentex Communications mike@sentex.net
Cambridge, Ontario Canada www.sentex.net
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