topic Re: Cannot Open /dev/st0 in Operating System - Linux

Cannot Open /dev/st0

Elizangela Fernandes — Mon, 25 Apr 2005 12:25:36 GMT

Hi,

I`m use Red Hat 2.1 Enterprise and connect the new tape device, a Dell tape Device.

When I try backup with tar, the message appear:

tar: /dev/st0: Cannot open: No such device
tar: Error is not recoverable: exiting now

The file permissions:
crw-rw---- 1 root disk 9, 0 Mar 19 2002 /dev/st0

Dmesg is atached

I execute

depmod
modprobe st

and

depmod -a
modprobe aic7xxx

but the same message appear.

Can anyone help me please.

My server don`t have backup.

Re: Cannot Open /dev/st0

Slawomir Gora — Mon, 25 Apr 2005 12:54:52 GMT

Hi,

in your dmesg output there is no info about
tape (st) driver.

show me output commands:
1. cat /proc/scsi/scsi
2. lsmod

Re: Cannot Open /dev/st0

Stuart Fuller_2 — Mon, 25 Apr 2005 13:09:49 GMT

The dmesg output does not indicate that a tape drive was found.

What kind of a Dell tape device is this? Is it SCSI?

Re: Cannot Open /dev/st0

Elizangela Fernandes — Mon, 25 Apr 2005 13:40:39 GMT

Atacched proc/scsi

Model is a Dell Super DLT 320 Power Volt 110T.

[root@soaapp03p root]# lsmod
Module Size Used by Not tainted
vfat 13244 0 (autoclean)
fat 40408 0 (autoclean) [vfat]
ide-tape 61120 0 (autoclean)
sr_mod 17592 0 (autoclean) (unused)
cdrom 35520 0 (autoclean) [sr_mod]
st 30548 0 (autoclean) (unused)
tg3 50496 1
usb-ohci 23456 0 (unused)
usbcore 68896 1 [usb-ohci]
ext3 71264 6
jbd 55636 6 [ext3]
aic7xxx 127200 0
aacraid 34516 8
sd_mod 13856 8
scsi_mod 127292 5 [sr_mod st aic7xxx aacraid sd_mod]

Thanks

Re: Cannot Open /dev/st0

Slawomir Gora — Mon, 25 Apr 2005 13:45:44 GMT

Hi,

one more file
cat /proc/scsi/scsi

Re: Cannot Open /dev/st0

Elizangela Fernandes — Mon, 25 Apr 2005 13:49:12 GMT

[root@soaapp03p root]# cat /proc/scsi/scsi
Attached devices:
Host: scsi0 Channel: 00 Id: 00 Lun: 00
Vendor: DELL Model: PERCRAID Mirror Rev: V1.0
Type: Direct-Access ANSI SCSI revision: 02

Thank's

Re: Cannot Open /dev/st0

Slawomir Gora — Mon, 25 Apr 2005 14:10:31 GMT

Hi,
your system doesn't see tape drive - no entry in /proc/scsi/scsi.
Is your tape recognized by SCSI Adapter BIOS during system startup ?
Maby you have hardware problem -check cable, terminator if needed.

Re: Cannot Open /dev/st0

Elizangela Fernandes — Mon, 25 Apr 2005 14:17:55 GMT

Sorry,

I`m new user in Linux.

I checked cables and the terminator is OK.

The Tape is a LVD. This tape work ok at a windows system

Dell said that the drive was at System Kernel.

Re: Cannot Open /dev/st0

Stuart Browne — Mon, 25 Apr 2005 18:56:08 GMT

Did you plut the tape drive in whilst the machine was up?

Or have you since power-cycled/rebooted the server?

You may need to get the SCSI subsystem to rescan the SCSI bus'.

Re: Cannot Open /dev/st0

Eric van Dijken — Tue, 26 Apr 2005 01:24:32 GMT

Can you see the Tape drive, when you enter the Adaptec bios menu?

If it doens't show there, no matter what you do on Linux level will activate your tape drive. But it will tell that you have a hardware problem, not a Linux problem.

Once you fix that, i am sure your tape drive on Linux will work just fine.

Re: Cannot Open /dev/st0

Elizangela Fernandes — Tue, 26 Apr 2005 10:29:49 GMT

I don`t reboot the server . It's necessary. Sorry because in the HP-UX don`t need.

Thank`s.

I don`t know what do.

Re: Cannot Open /dev/st0

Stuart Browne — Tue, 26 Apr 2005 22:38:39 GMT

If you can't reboot the server, and it's plugged into one of the Adaptec SCSI controllers, then try getting the SCSI bus to re-scan it's self.

There was a post a few days ago with hot-swap drives, which lists how to do it.

Re: Cannot Open /dev/st0

Gopi Sekar — Wed, 27 Apr 2005 00:57:42 GMT

I had the same problem earlier on. Linux could not able to detect the external tape drives (for that matter any external connected devices) reliably.

You have two choices: Reboot the server and keep the tape drive powered on when the system boots up, so when kernel scans the SCSI bus it will detect the tape drive. If kernel detects the tape drive then dmesg output will list st0 or nst0 entries

Another not so reliable method is to power on the tape drive and ask the kernel to rescan the SCSI bus. Check the below link on how to accomplish this.
http://www.whoopis.com/howtos/tapebackup.html

Hope this helps,
Gopi

Re: Cannot Open /dev/st0

Elizangela Fernandes — Mon, 16 May 2005 14:45:05 GMT

Hi people,

Sorry but I rebooted my server yesterday and the problem continue.

How Can I get the tape drive model for put in the startup?

Anybody help me?

Thanks

Re: Cannot Open /dev/st0

Stuart Browne — Mon, 16 May 2005 21:02:26 GMT

When the system boots, prior to the OS or disks even being touched (i.e. in the BIOS phase), you should see each SCSI controller initialize.

It has a big banner saying "Adaptec ...". These will be followed by some lines which start with a number between 1 and 16.

At least one of them should be your tape drive.

Reboot the server while watching the screen. Use the 'Pause' key on the keyboard to hold the display whilst you write the details down.

Come back with that info.

Also, once the machine is booted, grab the contents of '/proc/scsi/scsi' too.

Post back with the details.

Re: Cannot Open /dev/st0

Chris_815 — Thu, 07 Jul 2005 15:56:43 GMT

I have the same problem, well I get the error message:

./staging/
./staging/jitsicpdc
tar: /dev/st0: Wrote only 0 of 10240 bytes
tar: Error is not recoverable: exiting now

My tape drive is detected: (/proc/scsi/scsi)

Attached devices:
Host: scsi1 Channel: 00 Id: 03 Lun: 00
Vendor: HP Model: Ultrium 2-SCSI Rev: F48D
Type: Sequential-Access ANSI SCSI revision: 03

and the modules are loaded (lsmod)

Module Size
loop 8496
vmnixmod 201952
bcm5700 79428
st 25940

so it is being loaded... same message.
tar: /dev/st0: Wrote only 0 of 10240 bytes
tar: Error is not recoverable: exiting now
Any ideas?

Re: Cannot Open /dev/st0

Roderik Hamers — Fri, 08 Jul 2005 02:12:14 GMT

/dev/ cannot be contacted directly, just mount it before you use it. "mkdir /mnt/tapedrive; mount /dev/st0 /mnt/tapedrive/"

To start the tape drive in the beginning use your /etc/fstab

Re: Cannot Open /dev/st0

Ivan Ferreira — Sun, 10 Jul 2005 16:47:42 GMT

Tape devices doesnt have to be mounted!

You can force a SCSI detection without rebooting the server using the rescan-scsi-bus.sh script:

www.garloff.de/kurt/linux/rescan-scsi-bus.sh

If you still have the "No such device" error, then your device is not being detected.