SCSI Tape Library on Virtual Machine

designator · 06-30-2008, 06:45 PM

I'm trying to move our backup server to a virtual machine on the same host which has Overland tape library (jukebox for 18 tapes) hooked up to it. I have very limited experience with SCSI devices and I'm not sure how to map the tape library to the virtual machine. How can translate something like /dev/nst0 to SCSI 0:6?

Host machine is running RHEL 4. Guest is CentOS 5.

I'm pretty much lost and running out of time. Any suggestions welcome.
Thanks.

designator · 07-02-2008, 10:18 AM

I found the following in /var/log/messages:

Code:

Jul  1 17:13:46  kernel: scsi4 : Adaptec AIC7XXX EISA/VLB/PCI SCSI HBA DRIVER, Rev 6.2.36
Jul  1 17:13:46  kernel:         <Adaptec 2940 Ultra SCSI adapter>
Jul  1 17:13:46  kernel:         aic7880: Ultra Wide Channel A, SCSI Id=7, 16/253 SCBs
Jul  1 17:13:46  kernel:
Jul  1 17:13:46  kernel: (scsi4:A:5): 40.000MB/s transfers (20.000MHz, offset 8, 16bit)
Jul  1 17:13:46  kernel:   Vendor: SONY      Model: SDX-500C          Rev: 010D
Jul  1 17:13:46  netfs: Mounting other filesystems:  succeeded
Jul  1 17:13:46  kernel:   Type:   Sequential-Access                  ANSI SCSI revision: 02
Jul  1 17:13:46  kernel: (scsi4:A:6): 20.000MB/s transfers (10.000MHz, offset 8, 16bit)
Jul  1 17:13:46  kernel:   Vendor: OVERLAND  Model: LIBRARYPRO        Rev: 0420
Jul  1 17:13:47  kernel:   Type:   Medium Changer                     ANSI SCSI revision: 02
Jul  1 17:13:47  kernel: st: Version 20040403, fixed bufsize 32768, s/g segs 256
Jul  1 17:13:47  kernel: Attached scsi tape st0 at scsi4, channel 0, id 5, lun 0
Jul  1 17:13:47  kernel: st0: try direct i/o: yes (alignment 512 B), max page reachable by HBA 1048575
Jul  1 17:13:47  kernel: Attached scsi generic sg0 at scsi0, channel 0, id 0, lun 0,  type 0
Jul  1 17:13:47  kernel: Attached scsi generic sg1 at scsi1, channel 0, id 0, lun 0,  type 0
Jul  1 17:13:47  kernel: Attached scsi generic sg2 at scsi2, channel 0, id 0, lun 0,  type 0
Jul  1 17:13:47  kernel: Attached scsi generic sg3 at scsi3, channel 0, id 0, lun 0,  type 0
Jul  1 17:13:47  kernel: Attached scsi generic sg4 at scsi4, channel 0, id 5, lun 0,  type 1
Jul  1 17:13:47  kernel: Attached scsi generic sg5 at scsi4, channel 0, id 6, lun 0,  type 8

I assume that means the Tape library is mapped to /dev/sg5 and the tape drive inside it to /dev/sg4.
But I couldn't find what the controller was mapped to.

Any suggestions?