Adaptec 79xx > 1GB I/O errors

I have been getting the following I/O errors while stress testing a system with the latest Adaptec 79xx driver (1.3.0BETA2):

Jan 14 09:29:13 asl200 kernel: SCSI disk error : host 0 channel 0 id 0 lun 0 return code = 8000002
Jan 14 09:29:13 asl200 kernel: Info fld=0x86c552, Deferred sd08:02: sense key Hardware Error
Jan 14 09:29:13 asl200 kernel: Additional sense indicates Internal target failure
Jan 14 09:29:13 asl200 kernel:  I/O error: dev 08:02, sector 487312

Jan 14 10:36:37 asl200 kernel: (scsi0:A:0:0): Locking max tag count at 64

This is with kernel 2.4.19 + 2.4.19rc5aa1. I have tested with several different Ultra 320 drives, with the same result. If I remove memory from the machine so that it only has 1GB, then everything is solid as a rock. If I plug a zero channel raid controller into the same system (dpt_i2o), then I don't get any I/O error regardless of the amount of RAM. Any thoughts?

Mike

Different U320 drives of the same make/model, or different makes and models? The driver cannot "fake" a device returning an internal target failure error. I have only seen this on certain U320 Seagate drives and my understanding is that it is a drive firmware problem exposed under high transaction loads.

The locking max tag count diagnostic is normal. It means that the driver has determined the maximum queue depth of your disk.

I bet there is less I/O going to the drives too.

The RAID controller will eat these messages. Remeber that it only *emulates* a SCSI controller. It doesn't always act like one.

Beat up on your driver vendor?

--
Justin