device path for device

[peterchu]

I have connected a new external tape device to my server , in another server , I use the device path /dev/st0 for the internal device , but I can't use the same device path for the new external tape device now , are they different for internal and external device ? if yes, what is the device path for external device ? thx in advance.

[Huc_1]

I dont think there is any particular device path for external tape.

If the controleur is seen and the tape is correctly attached it should be pick-up by the kernel and/or by the build in loadable modules

This is usualy logged in /var/log/messages and can be found with dmesg

Could you tell us more about your setup, lsmod extract of dmesg or boot log would help

J-P

[peterchu]

attach the lsmod and dmesg log , please help to advise what is the device path .. thx in advance.

[peterchu]

dmesg.txt

[peterchu]

lsmod.txt

[Stuart Browne · Accepted solution]

Ok. I take it this 'dmesg' is from before the tape drive was attached.

It looks as if the tape drive hasn't been detected at this point.

At the very least, you need to get the SCSI controller to re-read it's attached ID's (I'm unsure how to do that with your controller. A reboot will do it).

For the moment though, does '/proc/scsi/scsi' list a 'SEQUENTIAL-ACCESS' device along with the 'DIRECT-ACCESS' and 'Processor' devices?

If it does, then you can probably get away with 'modprobe st' ('st' being the driver module that drives tape drives in Linux).

If not, reboot, try again.

[peterchu]

the below is my vi /proc/scsi/scsi , could help to analyse. thx in adance

Attached devices:
Host: scsi0 Channel: 00 Id: 00 Lun: 00
Vendor: IBM Model: SERVERAID Rev: 1.00
Type: Direct-Access ANSI SCSI revision: 02
Host: scsi0 Channel: 00 Id: 15 Lun: 00
Vendor: IBM Model: SERVERAID Rev: 1.00
Type: Processor ANSI SCSI revision: 02
Host: scsi0 Channel: 01 Id: 08 Lun: 00
Vendor: IBM Model: 32P0032a S320 1 Rev: 1
Type: Processor ANSI SCSI revision: 02

[Ivajlo Yanakiev]

Last time that I have problem with tape device using RAID CTL was hard :)
this documents may be help you:
http://linuxbg.com/how_to/Tape_CCISS/Tape_scsi.txt
You must read kernel doc for your RAID CTL.