drive unavailable

[Muthyam Reddy]

Hi * SMs,

I have a drive(/dev/rmt2) proble showing "drive unavailable since /09/23/01 09:09:27"
I used update commad to make it online, but I could not do.

we have total 8 drives in that third drive /dev/rmt2 is giving this problem.Remaining 
drives working properly.

Please can anybody send probable causes and solutions.
libraryname=3494LIB1
drivename=3590_2
device name=3590
device=/dev/rmt2

thanks in adv

/muthyam