Date: Thu, 11 Oct 2001 12:35:58 -0600 From: Scott Long <scott_long@btc.adaptec.com> To: Alexey Koptsevich <alex@astro.su.se> Cc: scsi@freebsd.org Subject: Re: one array from both channels in Adaptec 3210S? Message-ID: <20011011123557.A406@hollin.btc.adaptec.com> In-Reply-To: <Pine.GSO.4.10.10110112026300.12138-100000@dioscuri.astro.su.se> References: <Pine.GSO.4.10.10110112026300.12138-100000@dioscuri.astro.su.se>
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On Thu, Oct 11, 2001 at 08:33:15PM +0200, Alexey Koptsevich wrote: > > Hello, > > I wonder is that possible to configure disks from both channels to > work in one array in Adaptec 3210S? Yes it is. You cannot, however, create and array that spans multiple adapters. > Also, how many discs can I put to a channel and avoid decreasing > performance? I think, if modern disk is able to transfer 30 Mb/s only 5 > disks can be put to one channel, so 10 disks is practical limit for > 2-channel Ultra160 controller. But it is only an idea, what does follow > from the experience? It follows the law of dimishing returns. Every disk that you add will increase performance my a lower factor than the previous. You also have to remember that performace is also based on the PCI bus and the CPU on the controller. If the card is only in a PCI 33MHz/32Bit slot, you can only get 132MB/s max (actually much less than that in real life). > Also, I guess there are no SCSI 320 RAID controllers? Coming soon.... Scott To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message
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