From owner-freebsd-hardware@FreeBSD.ORG  Wed Mar 24 07:53:53 2004
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Date: Wed, 24 Mar 2004 16:53:44 +0100 (CET)
From: Olaf Hoyer <ohoyer@ohoyer.de>
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To: Nelis Lamprecht <nelis@brabys.co.za>
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cc: freebsd-hardware@freebsd.org
Subject: Re: Slow transfer speeds with U320 drives and HP Smart Array 641
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On Wed, 24 Mar 2004, Nelis Lamprecht wrote:

> Hi,
>
> With the ciss driver on my HP ProLiant ML350 I've noticed the transfer
> speed on my RAID controller is only.
>
> da0 at ciss0 bus 0 target 0 lun 0
> da0: <COMPAQ RAID 1  VOLUME OK> Fixed Direct Access SCSI-0 device
> da0: 135.168MB/s transfers
> da0: 69459MB (142253280 512 byte sectors: 255H 32S/T 17433C)
>
> Both my drives on the RAID controller are U320 72GB pluggable SCSI's.
> The RAID card also has the optional 64MB battery backed write back cache
> enabler installed.

Hi!

well, I also see the possibility that in this case, the theoretical
transfer limit of the PCI Bus is displayed...

Yes, the the controllers are 64bit, but... would explain a bit.

Just my 2 Cents
Olaf




-- 
Olaf Hoyer        ohoyer@gaff.hhhr.ision.net
Fuerchterliche Erlebniss geben zu raten,
ob der, welcher sie erlebt, nicht etwas Fuerchterliches ist.
(Nietzsche, Jenseits von Gut und Boese)