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Old 01-14-2008, 03:42 PM   #1
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Registered: Apr 2007
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Tape device doesn't seem to be recognized by the kernel

hi guys and girls,

i have added a new HP tape device into my linux box, the problem is that i wasn't able to detect the device and its library, the only devices available in /dev are st0 and nst0.

i have been trying to make the generic scsi devices, but i couldn't.though the module is already loaded into the kernel. but couldn't do nothing.

the output of my /proc/scsi/scsi

# cat /proc/scsi/scsi
Attached devices:
Host: scsi0 Channel: 00 Id: 03 Lun: 00
Vendor: HP Model: C7438A Rev: ZP76
Type: Sequential-Access ANSI SCSI revision: 03

so i had to explicitly force the loading of a module at boot time by doing the following.

# echo modprobe sg > /etc/rc.modules
# chmod +x /etc/rc.modules

after i reboot my server, the device sg0 was created in /dev directory, i belive that this is the device but there was no library.

so i thought i should try to test it and the following appears

[root@MOT_SERVER bin]# tar -cvf /dev/sg0
tar: /dev/sg0: Cannot write: Cannot allocate memory
tar: Error is not recoverable: exiting now

can someone please guide me through what i am suppose to do on a step by step bases. because i am kinda new to linux,
Old 01-14-2008, 04:28 PM   #2
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Registered: Mar 2004
Location: Cary, NC, USA
Distribution: Fedora, Kubuntu, RedHat, CentOS, SuSe
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Does this device have a loader and tape reader? I'm trying to figure out why you aren't trying to write to /dev/st0 or /dev/nst0. What is it that makes you think these aren't your SCSI Tape drive?

From the st man page:

/dev/st* : the auto-rewind SCSI tape devices
/dev/nst* : the non-rewind SCSI tape devices

What happens if you try to write to them?

tar -cvf /dev/nst0
tar -cvf /dev/st0

Let us know,

Old 01-15-2008, 02:58 AM   #3
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Registered: Apr 2007
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scsi generic devices

i want to create a scsi generic devices because i am using a product called oracle secure backup and it requiores a generic scsi to be installed on the server to function


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