S/W state No_HW

[CU_1]

we are using MSL6000 tape library for Backup, It is installed with two hp rx4640 servers when I run ioscan I found the S/W state for tape drive is NO_HW. also, the following message appeare in the Data Protector Manager:
"From: BMA@tudb1.tu.edu.sa "HP:Ultrium 2SCSI_1" Time: 7/7/2010 8:10:30 AM
Device address not found."
and the Backup now is taken by the second server that has no problem with tape drive.
I need help to solve this problem and I need to know what's happen to the driver to be in this state?

[Steven E. Protter]

Shalom,

The tape drive is either powered down or there is a problem.

Check:
SCSI ID for conflict
Cables for being snug and not damaged.

SEP

[Prashanth.D.S]

Hi,

NO_HW status means that the system is unable to recognize the device connected, could be issue with the cable connected across or the controller.

Best Regards,
Prashanth

[Suraj K Sankari]

Hi,

NO_HW means system not detecting the hardware which attached to system.
check cable, connecter (if used) and the tape drive itself.

Suraj

[CU_1]

If it is powered down why it is working with the second server? I have already checked the cables every thing looks normal.

[Bill Hassell]

> it is working with the second server?
> I have already checked the cables every thing looks normal.

So the tape drive is OK and the (I assume) fibre cables seem to be plugged in. I'll assume that the tape drive is part of a SAN switch, so the next step is to login to the switch and verify that you can see the first server is visible and that the switch has zoned the tape drive to both systems at the same time.

The NO_HW message means that I/O card probed the address where the tape drive was located in the past and got no response.

[Torsten.]

> Backup now is taken by the second server that has no problem with tape drive.

Same library? Same drive?

So the library must be OK and the problem is somewhere between server and library (FC cables, HBA, switch).