thanks for the info. My knowledge of SCSI is truly limited, and I probably
should not be going bleeding edge with my fist attempt (although SCSI 3
should be out soon right :) )
I have isolated this to just the contoller & drive and iether a SCSI CDROM
or a NIC.
Once all this is working though is to have an all SCSI system - drive(s),
CDROM, CDRW, and probably a scanner at the very least. This is where I
thought the U2W would be worth it. From the looks of things I probably
should have gotten UW.
Still not sure where this will end, but I hope it's soon.
===== Original Message from Eric Hegstrom <[EMAIL PROTECTED]> at
4/21/99 12:32 pm
>No worries.
>
>You should still be able to set the BIOS to negotiate with the drive up
>to it's maximum interface speed. I missed the original posts of this
>message, but is it true that this is an LVD interface (80 MB/sec). I
>was just saying that you won't actually be able to copy data to the
>drive at that sustained throughput. I have no experience with the LVD
>drives. I just wanted to say that I haven't any problems with the 9ZX -
>I would personally recommend it. And for what it is worth I am using the
>ASUS P2BS motherboard with the onboard AIC-7890 UW/LVD controller.
>Previous to the RedHat 5.2 release it was kind of flacky. Are you using
>the latest build of the driver? I had trouble getting everything patched
>corectly so I just went out and bought the 5.2 Redhat and it installed
>correctly. I have the 9ZX in a removable drawer and I take it home and
>use it on a machine with the 2940UW card at home. I even have internal
>automatic termination set on the that unit (which I guess is asking for
>trouble).
>
>Personally I have been avoiding the LVD drive interfaces. The UW2 is
>fast enough for me (since I usually only have 1 drive, and at most 2, on
>the bus). It is a common mistake to confuse interface speed with
>sustained throughput of the drive. The interface transfer rateis the
>maximum transfer rate that the controller can negotiate with the drive
>(80MB/sec LVD, 40MB/sec UW2), and the sustained throughput of the device
>is limited by the media transfer rate (how fast the data can be
>physically written to the drive). With multiple devices on the bus
>having high interface transfer rates is great when it works 'cause you
>can service the SCSI targets that much faster. With just one SCSI target
>it is a wash. I am by no means an expert on this. I assume you have
>tried this drive alone.
>
>-Eric
>
>Charles Galpin wrote:
>>
>> please excuse my ignorance, but this is my first experience with SCSI...
>>
>> ===== Original Message from Eric Hegstrom <[EMAIL PROTECTED]> at
>> 4/21/99 10:47 am
>> >Well lloking at that URL, I see thatthe Maximum Interface transfer rate is 80
>> >MB / sec, but the Media transfer rate 108.6 to 171.1 Mbits / sec which is
>> >13.575 - 21.3875 MB/sec.
>>
>> Ok, what is the net result? that I can only expect 13.575 - 21.3875 MB/sec
>> and to set the BIOS accordingly? I tried 13.5 and 10 MB without luck, and
>> would say that for this speed perhaps this U2W controller/drive is not worth
>> it!
>>
>> >
>> >I have the 10200 RPM wide version of this drive (the IBM Ultrastar 9ZX I
>> >beleive) and I have 2 systems (one with an internal AIC-7890 Adaptec UW/LVD,
>> >the other with a 2940UW). The drive works great in both systems. I am able to
>> >get almost 18MB/sec sustained transfer rate for streaming. I remember just a
>> >few years ago when we needed to buy $8K RAID arrays at work to get 12MB+/sec.
>>
>> is this one of those integrated into an P2Bs? I considered going that route,
>> but figured it ould be better to have a seperate adapter and get a less
>> expensive AMD cpu now, and later upgrade if I want.
>>
>> >Oh yea, I am using the Redhat 5.2 install (I think it is kernel 2.0.32 but I am
>> >not sure)
>> >
>> >Peace,
>> >Eric
>>
>> -- Charles Galpin <[EMAIL PROTECTED]>
>
>--
>Eric Hegstrom .~.
>Senior Software Engineer /V\
>Sonoran Scanners, Inc. // \\ L I N U X
>[EMAIL PROTECTED] /( )\ >don't fear the penguin<
>520-617-0072 x402 ^^-^^
-- Charles Galpin <[EMAIL PROTECTED]>
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