Date: Mon, 28 Jan 2002 23:05:31 +0100 From: ptiJo <ptiJo@noos.fr> To: freebsd-stable@FreeBSD.ORG Cc: freebsd-questions@FreeBSD.ORG Subject: divers SCSI questions... Message-ID: <20020128230531.20f8d55b.ptiJo@noos.fr>
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Hi,
as I never played with SCSI and get an old PCI Card, I would like to be enlightened a bit :)
so, I got the "Adaptec AHA-2940UW" which specs are:
Computer Bus:
PCI Local Bus
Interface Protocol:
Bus master DMA
Host Bus Burst Data Rate:
133 MByte/sec
Peripheral Bus:
8-bit and 16-bit Wide UltraSCSI
SCSI Synchronous Data Rate:
40 MByte/sec
SCSI Asynchronous Data Rate:
3.3 MByte/sec
Device Protocol:
SCSI-1, SCSI-2, SCSI-3, Wide UltraSCSI
Device Support:
Up to 15 devices under DOS 5.0 and above
Here are the questions :)
-1- does the data rates specify that, in general, the transfer rate is 3.3 MBytes/sec ?
-2- 15 devices under DOS... would it be more under FreeBSD ? is there also a limitation on total size that I would get (15*36Go or 15*9Go, for eg) ?
I would like to buy disks now :)
IBM 36 Go 10000 RPM SCSI
IBM 18 Go 10000 RPM SCSI
IBM 9 Go 10000 RPM SCSI
-3- do I have to take special care ? I mean, the supported device protocol are SCSI-{1,2,3} and Wide - do all disks (like those recent above) supports @least one of them ? Or do I have to check the disks specs to see which protocol they support ?
thX a lot for answers,
---------------------
ptiJo <ptiJo@noos.fr>
Linux: For those who don't like Windows
*BSD: For those who like UNIX
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