I'll do a bit of cut and pasting here from previous emails to get everyone
up to speed :) Sorry this might get a bit long.
First to answer your questions, Yes the CDROM is on a 50 pin bus, not I have
not tried to lower it's tranfer rate. I have tried with the drive only (no
other SCSI devices) by doing an nfs install. no difference.
I tried attaching an IDE drive so I could get a base install and upgrade it
to a 2.2 kernel and the latest scsi drivers since I have corresponeded with
someone who has the 2940U2W working fine, but added this card to an existing
system running 2.2.6.
Anyway, when I add the drive, enable IDE support in the bios, it does not
get detected by my MOBO, and then the system won't boot off the scsi drive
anymore. I tried as master on both primary and secondary channel - no
difference. I will try again tonight, but removing the adaptec controller,
and only adding it back when linux is up and running.
I am going to order another drive today and return this one. It cannot hurt
(except cost me shipping and restocking/handling fees).
I do have another system I could compile a new kernel on, I'ts currently
running Red Hat 5.2. I don't know if I can get the latest scsi driver
without going to a newer kernel (currently 2.0.35), and am also scared to
upgrade the kernel (laptop see). I guess this might be one of the easier
ways, but don't even know how to make a boot/install floppy with the latest
kernel.
I have tried another cable.
I have isoloated it down to only using the HD on the 68 pin chain, and
trying an nfs install. I have an active terminator at the end of the chain,
and the card termination on. There is no change in the behaviour, and again
all this works under NT.
One thing that might be of relevance is I seem to get different errors
depending on whether I cold booted or not. I had dropped the tranfer rate
down to 10mb, and started getting a different error that the timeouts. When
I raised it back up, I got this same error (not the timeout) , until a cold
boot which put me back at the timeouts.
And from my original post :
First a summary:
During installation of Redhat 5.2, it hangs on the dialog saying it is
scanning for SCSI devices. Virtual console 4 shows the adapter has been
recognized, and the module installed. I get the following error repeatedly:
<4> scsi: aborting command due to timeout: pid0, scsi0, channel0, id0, lun0,
0x00 00 00 00 00
Full blown details:
OS: Redhat Linux 5.2
OS: NT Serve 4.0 - all works fine
MB/CPU: Epox MVP3G (award bios) / AMD K6 2 450
Adapter: 2940U2W bios v2.01.0
Drive: ibm ultrastar 9ES DDRS 39130 (9gb LVD/ultra 2 wide)
CDROM: toshiba XM6401
CDRW: yamaha4416S
SCSI module: 5.1.2/3.2.4 (CD) and 5.1.7/3.2.4 (latest boot floppy)
---------------------------------------------
| controller[ID 7] |
| |
| ( chain 0 - 68pin) |------------------ HD [ID 0]
------- Active Terminator
| |
| ( chain 1 - 50 pin) |
---------------------------------------------
|
|---------- CDRW [ID 3] ----------CDROM [ID 6] (drive
terminted w/ jumper)
On install It gets as far as the SCSI dialog, says
Scanning Adaptec 2740, 2840, 2940 SCSI bus...
and hangs. I get the following from the virtual consoles
Alt-F3:
pci probe finds 1 SCSI device
runs insmod on /modules/aic7xxx.o
Alt-F4:
finds adapter, downloads sequencer code
<4> scsi: 1 host
followed by many many
<4> scsi: aborting command due to timeout: pid0, scsi0, channel0, id0, lun0,
0x00 00 00 00 00
What I know for sure:
The adaptec bios installs properly on boot up (tried disabling it - didn't
help my problem and NT won't boot without it)
The adaptec bios sees all the devices without problems
I can boot off the CDROMs
I have tried the following:
isolated the problem by removing the 50 pin chain and installing via NFS -
same error
turned off all IDE support in the bios (award)
Turned on termination in the adaptec bios (default auto)
2 different 68 pin cables (not cheap)
tried the drive at the end of the chain without a terminator (online docs at
ibm website says this shoud be valid)
===== Original Message from Eric Hegstrom <[EMAIL PROTECTED]> at
4/21/99 1:39 pm
>Well keep plugging away on it. Have you tried lower the negotiation
>speed to the other devices (SCSI CDROM) on that bus. I am assuming the
>CDROM is a narrow device (50 pin). Is it hooked up to the narrow
>connector on the 2940?
>
>How I have mine hooked up is:
>1. CDROM hooked to the 50 pin IDC narrow connector with internal
>termination on the CDROM.
>2. 9ZX hooked up to the wide 69pin connector with an active terminator
>on the end of the cable.
>3. Automatic internal termination enabled on the 2940 (not always
>suggested but works for me)
>
>Here's my lame attempt at ASCII art
> narrow wide
> | |
> CD-ROM v v Wide
> internal----------- 2940 ============================= Active
> termination || Terminator
> IBM 9ZX
>
>I am still confused as to if your drive is LVD is simple UltraWide. Do
>you have the latest drivers?
>
>-Eric
>Charles Galpin wrote:
>>
>> 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]>
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