Date: Thu, 11 Oct 2001 13:44:59 -0500 From: Jim Bryant <kc5vdj@yahoo.com> To: Alexey Koptsevich <alex@astro.su.se> Cc: scsi@freebsd.org Subject: Re: one array from both channels in Adaptec 3210S? Message-ID: <3BC5E8AB.1050400@yahoo.com> References: <Pine.GSO.4.10.10110112026300.12138-100000@dioscuri.astro.su.se>
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man vinum
Also, I wouldn't actually run 5 disks, as that can saturate the bus or come damn close if all drives are transferring, 4 would be
reasonable. This pretty much depends on your usage though. If you are doing lots of random seeks and few sustained transfers, then
you can run many more disks than four or five. Assuming large sustained transfers, assume one drive less than the bandwidth would
suggest you can to avoid bus saturation. This is my rule of thumb, and I'm sure others will give you theirs.
Alexey Koptsevich wrote:
> Hello,
>
> I wonder is that possible to configure disks from both channels to
> work in one array in Adaptec 3210S?
>
> 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?
>
> Also, I guess there are no SCSI 320 RAID controllers?
>
> Thanks,
> Alex
>
>
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jim
--
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