Symbios 53c416 SCSI fails to detect drive
 

Hi All,

I have a Supermicro dual PII/PIII motherboard with on-board Symbios 53c416 dual-channel SCSI. I just finished installing it with Slackware 9.1 as a file server. Everything has been great, until I tried to add a new 9.1 GB drive as a PXE boot share for my cluster. The on-board SCSI fails to detect the drive, even though it's OK with all the other drives. The existing drives are Quantum ATLAS IVs. The new drive is a Seagate 39102LC, which originally came from a Sun machine. I'm running a (good) SCA converter on the the drive, so it's not hot-swap anymore. Depending on the SCSI ID set on the new drive, sometimes the Symbios SCSI doesn't detect any drives at all and everything comes to a halt (yes all the IDs are always unique, the chain isn't full).

If I plug the SCSI chain into an old Adaptec 2940, everything is detected, including the new drive, which is recognised as 39102LCSUN 9.0, so there's some sort of Sun-specific tagging there.

I realise this isn't a Linux problem, it's a pure hardware issue, but I was hoping someone might have seen this before and could help me. I can limp along with the 2940, but it doesn't have the throughput of the on-board SCSI. Then again, I suppose the Adaptec is actually ahead if the on-board throughput is 0....

Anyone seen this before?

Thanks in advance,

Damien