I've recently added an IBM DNES-309170 9GB wide SCSI drive to our NW312 server, which previously had two Seagate ST15150N narrow Scsi drives (these are still attached).
These two ran flawlessly for years with the SYS: volume shared between them. Now the SYS volume is spanning all 3 drives.
The Seagates share a 50 pin narrow scsi cable (last with termination on), the new drive is second-to-last device on the 68 pin cable, with active terminator at end of cable - the IBM drive has no internal terminator option. The Controller card is an Adaptec AHA2940UW.
When there is normal disk activity the server runs fine, but at night when disk usage drops to near zero, the SYS: volume dismounts with a message: DRIVER DEACTIVATED DUE TO DEVICE FAILURE: IBM DNS309170.
The disk utilities built into the SCSI card BIOS check the disk drives and find no flaws at all.
I've tried various options in the Adapted SCSI BIOS setup:
Disconnect: on and off,
Transfer rates from 5 to 40 MB/s,
Sync negotiation: on and off,
Wide transfer initiation: on and off
Tag queueing disabled and enabled
I tried the wide SCSI IBM disk shared on the narrow SCSI cable, with 68-50 pin adapter; tried a different SCSI controller card; & the IBM drive is set to Single ended mode, not LVD.
Nothing seems to have any effect... this problem ONLY occurs a few hours after activity on the SYS: volume drops to near zero.. if I leave a backup running overnight - no problem!
The only thing left to try is TERM PWR ENABLED on the IBM drive, but Adaptec say with the AHA 2940 this is not necessary.
Any suggestions PLEASE!?