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Kevin:
> Sounds almost like an SCA SCSI setup. Are the drives in trays that
> look like they
Yes!
But I need to figure out the voltages for the power in. the backplane has a
scsi in and scsi out - the CDROM and Tape were connected via the SCSI out.
Also the cable had a SCSI external connector that was attached to a hidden
window on the front of the AS/400.
Where did you buy the SCA unit? Ideally, I'd like to put the disks in an
external unit, because I cannot fit them inside the PC. I was considering
trying to use the AS/400's chassis and backplane - but powering it seems
like it maight be a kludge.
> "W. Chris Shank" wrote:
>>
>> So I picked up a free AS/400 yesterday (and boy is my back killing me
>> - badda boom!) I couldn't find any information about what it would be
>> useful for outside of running OS/400, so I decided to strip out the
>> disks.
>>
>> The results were: 3 9.1Gb 7200RPM LVD UW SCSI drives, 1 20X SCSI
>> CDROM, and 1 QIC 2GB SCSI tape drive (and about 4 dozen tapes), and a
>> large UPS.
>>
>> Also, the disk drive housing is removable. It seems to be a SCSI
>> backplane (the drives plug into it) and holds up to 5 disks. I don't
>> think the backplane does any hardware raid, but I'm pretty sure the
>> AS/400 had a raid configuration since the original owners said it had
>> a total capacity of 18G. Anyone know what other tail-tell signs of
>> hardware would be? There is a PCI card that the SCSI cables are fed
>> from, but this card is mostly blank - meaning there are very little
>> electronics on it. And wouldn't a hardware raid want all the disks on
>> seperate cables? or would that only be for high throughput (which is
>> how i'd like to use the disks)?
>>
>> Anyway - if anyone knows anything about any of this hardware or can
>> point me to some more resources (IMB doesn't give up much data on it)
>> - please let me know.
>>
>> thanks!
>> -Chris
>
>
> Sounds almost like an SCA SCSI setup. Are the drives in trays that
> look like they might be hot-pluggable (with a single connector for
> power & scsi)? I've been playing with a 4 drive sca setup, and they
> usually have some kind of interface board, like you describe, to split
> scsi out for all the drives and combine the power signals into one
> connector/cable per drive.
>
> On the system I worked with, the drive controller decides if you do
> raid or not. It was a Mylex interface, and you could take all the
> drives attached to it and configure them just about any way you want.
> They could then end up as 4 individual logical drives, or all they way
> up to raid 0,1,5, etc... So that part depends on the scsi controller
> they are attached to (or even software, in the case of software raid.)
>
> --
> Kevin Brosius
>
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