Scsi tape drive not recognized on the library

This could just be muck and dirt in the library. The Mag needs to insert fully and be seen by the library.

Give the Mag itself a good visual inspection to make sure there are no broken pieces of plastic, and also clean out the space it sits in the library with a dry cloth or duster.
New Mags are available from www.tape-drive-repair.com as well as cheap repair options.
If you let me have more details as to exactly when this error occurs, then we can better track down exactly what is the issue. Either way this should be fairly cheap and easy to solve.

Look at this document to see if the interposer mechanism is holding the tape from ejecting. The solenoid that energizes to tape insertion or ejection sometimes relaxes and you have to move it manually out of the way to recover the tape.

http://www.filibeto.org/sun/lib/hardware/storedge/tape/l280/pin-024.pdf

Look for a physical reason for the robot to stall.

http://www.quantum.com/ServiceandSupport/SoftwareandDocumentationDownloads/PX502/Index.aspx

http://downloads.quantum.com/px500/PX502_Quick_Start_Guide_81-81292-03_B01.pdf

A tape may be sticking out of its cell or a drive.

Never use sticky labels anywhere on the cartridge.

Power down the computer, power down the library, disconnect the library from the computer, power it up. If the problem remains try it again but this time without any loaded tapes. If it is still in the error state check with Quantum Support.

power down both the library and computer, disconnect the library, power up the library. Check the operator panel of the library for an online ready status.

The library picker arm cannot move to the home position. There could be something blocking it. Try the Reset option from the Configuration menu. This is detailed in the library user guide.

Try putting the tape drive on the last scsi termination point.

That thing required a SCSI terminator pack doesn't it.

If so, is it working properly.

I've had those things go out on me before leaving me to pull my hair out many times.

The host backup application probably still has ownership of the library. You normally need to select to 'open door' or something similar to release ownership back to the library

Ok, I'm confused... are you sure this isn't router that you're mentioning isn't a SAN Switch? A StorageTek/Brocade 3250 switch... and this is a StorageTek Scalar 100 Tape Library with Fibre aware LTO Drives. The Library Users Manual can be found at http://downloads.quantum.com/scalar/S100/omS100UsersGuide.pdf. Switch information can be found at http://www.storagetek.com/products/product_page2304.html. I'm not a Sun guy, so I would suggest that you contact them to find out which versions of firmware for the switch that they have certified. With HP, there are certain versions of firmware that they certify with HPUX... and specific versions of HBA drivers that work better with HPUX as well. If it is, in fact a Brocade 3250, I would suggest that you start with a "switchshow"... figure out which port drive 4 attaches to... do a "porterrshow #" (# represents the port found) to see the port error statistics... you want to check the loss of signal and link failure count. I would do an "sfpshow #" to see the status of the transciever as well. Let us know.