SCSI write errors with Onstream ADR50 drive

From: Tom Sedge (tom@cognality.com)
Date: Mon Apr 03 2000 - 09:48:53 EST

Hi,

We've installed a new Onstream ADR50 drive (SCSI Ultra 3 LVD bus). It is
sitting in a machine with the following spec:

ASUS P2DS motherboard
2 x Dual PII 400Mhz
384RAM
Onboard Adaptec 2940U2W SCSI Ultra 3 LVD bus
1 x Seagate Cheeta 9.1Gb SCSI drive
3 x Seagate Cheeta 18.2Gb SCSI drives
D-link DFE530TX 10/100 Ethernet PCI
RedHat Linux 6.1 patched to kernel 2.2.13 + ac3 (SMP).
Software raid 5 across the 3 18.2Gb drives (not the boot drive)

The drive is properly recognised and reported on startup, and assigned to
/dev/st0.

All is well until we try reading or writing to a tape. The drive starts
to show write/read behaviour and then nothing happens for a minute or so
until a large number of SCSI write errors are reported by the kernel. At
this point the SCSI bus seems to go bananas an the hard drive light goes
fully on. The machine then stops responding and a reset is needed (to
reset the SCSI bus). After coming back up the machine is fine, and no
problems occur unless we try accessing the drive. Nothing is logged in
the system logs and there are no 'oopses'.

We've checked for SCSI Id conflicts and termination of the bus. Both seem
to be ok. Could this be an SMP problem? The addition of the ADR drive is
the only change to this machine recently.

If anyone can help, I'd be most grateful.

Best Regards,

Tom. 

--
Cognality Ltd.      tom@cognality.com   Where dreams become reality....

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