Date: Wed, 14 Jan 2004 17:52:50 -0500 From: "Mike Jakubik" <mikej@rogers.com> To: <freebsd-stable@freebsd.org> Subject: RE: Adaptect raid performance with FreeBSD Message-ID: <20040114225133.VOOG337742.fep03-mail.bloor.is.net.cable.rogers.com@win2000> In-Reply-To: <20040114151111.B4B3843D5D@mx1.FreeBSD.org>
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> -----Original Message-----
> From: owner-freebsd-stable@freebsd.org
> [mailto:owner-freebsd-stable@freebsd.org] On Behalf Of
> lists@mediumgreen.com
> Sent: Wednesday, January 14, 2004 10:11 AM
> To: freebsd-stable@freebsd.org
> Subject: Re: Adaptect raid performance with FreeBSD
>
> I think I heard Raymond Wiker say:
> >Ari Suutari writes:
> > > dd if=/dev/rda1s1a of=/dev/null bs=1m count=100
> > > 100+0 records in
> > > 100+0 records out
> > > 104857600 bytes transferred in 4.193832 secs (25002814 bytes/sec)
> > >
> > > So, I get only about 25MB/s. Shouldn't I be getting
> something like
> > > 70 MB/s, or even more since there are two disks that can
> server read
> > > requests ?
>
>
> FWIW, on my mylex controller w/ raid 5 I'm getting:
>
> # dd if=/dev/da0s1g of=/dev/null bs=1m count=100
> 100+0 records in
> 100+0 records out
> 104857600 bytes transferred in 3.707196 secs (28284882 bytes/sec)
>
>
> and my dell perc3/dc (raid 5) is getting:
>
> # dd if=/dev/amrd0s2e of=/dev/null bs=1m count=100
> 100+0 records in
> 100+0 records out
> 104857600 bytes transferred in 2.133522 secs (49147653 bytes/sec)
This sounds pretty poor for SCSI raid. Here are my results on a single
Maxtor ATA drive.
CPU: AMD Athlon(tm) Processor (1410.21-MHz 686-class CPU)
ad0: 76345MB <MAXTOR 6L080L4> [155114/16/63] at ata0-master UDMA100
# dd if=/dev/rad0s1a of=/dev/null bs=1m count=100
100+0 records in
100+0 records out
104857600 bytes transferred in 2.484640 secs (42202333 bytes/sec)
5 dd's running simultaneously show the following in iostast.
tty ad0 ad2 ad4 cpu
0 77 0.00 0 0.00 0.00 0 0.00 0.00 0 0.00 0 0 0 0 100
1 119 128.00 129 16.09 0.00 0 0.00 0.00 0 0.00 0 0 1 2 98
0 77 128.00 424 52.97 0.00 0 0.00 0.00 0 0.00 0 0 5 2 93
0 77 128.00 424 52.97 0.00 0 0.00 0.00 0 0.00 0 0 0 2 98
0 77 128.00 423 52.85 0.00 0 0.00 0.00 0 0.00 0 0 1 2 97
0 77 128.00 424 52.97 0.00 0 0.00 0.00 0 0.00 0 0 1 2 97
0 77 128.00 423 52.85 0.00 0 0.00 0.00 0 0.00 0 0 0 2 98
0 77 128.00 424 52.97 0.00 0 0.00 0.00 0 0.00 0 0 1 3 96
0 77 128.00 424 52.97 0.00 0 0.00 0.00 0 0.00 0 0 0 2 98
0 77 128.00 423 52.85 0.00 0 0.00 0.00 0 0.00 1 0 1 2 96
0 77 128.00 424 52.97 0.00 0 0.00 0.00 0 0.00 0 0 2 1 98
0 924 128.00 21 2.60 0.00 0 0.00 0.00 0 0.00 1 0 1 0 98
0 77 0.00 0 0.00 0.00 0 0.00 0.00 0 0.00 0 0 0 0 100
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