Tape drive is not detecting

[csreenivas]

With ioscan it is not showing anything
#ioscan -fnC tape

But with #ioscan -fn commmand it is showing as No_HW.
#ioscan -fn
target 9 0/4/0/0.4 tgt NO_HW DEVICE

What would be the problem? Is it due to tape drive problem or device files not created properly?

Thank You.

[A. Clay Stephenson · Accepted solution]

It could be hardware (bad/incorrect cable; bad/incorrect termination; bad controller; bad tape drive; duplicate SCSI ID's; mismatched SCSI architectures.

It could be bad firmware or missing drivers. Is the stape driver in the kernel? You might also be missing patches so that the drive is too new for the existing driver.

Since you are seeing any description of the device, I'm betting it's a hardware related error.

[csreenivas]

Thank You.Can you help me how to check for missing drivers and to check stape driver in the kernel.

[A. Clay Stephenson]

It varies a bit with the OS version but do a "kmadmin -k | grep tape"

You can also do sam -> Kernel Configuration -> Drivers and see if the desired driver is "In" or "Out".

You should also search the patch database for the latest stape cumulative patch applicable to your OS version.

[csreenivas]

Thank You.Now tape drive is detecting.
We identified the cause, there were loose connections.