[CentOS] sg device

Tony Schreiner schreian at bc.edu
Sat Dec 10 20:39:43 UTC 2005


Sorry, should have said Dell Power Edge 1650.

On Dec 10, 2005, at 3:28 PM, Tony Schreiner wrote:

> What is the "sg" device?
>
> The reason I ask, is that I have a file server running CentOS 4.2  
> on a Dell Precision 1650. Disks are attached via QLogic FC. I  
> backup to a Qualstar TLS-4222 tape changer, with AIT-2 tapes, which  
> is connected over an Adaptec 29160 Ultra 160 SCSI. The software I'm  
> using is Legato Networker version 7.1.2. I'm backing up a bit under  
> 1 TB a month with this.
>
> Quite frequently these days (meaning once a month or two), the  
> Networker software loses the ability to control the tape changer.  
> Mount, unmount commands just don't work any more. The only way I  
> can seem to fix it, is to use the Networker admin software to  
> remove the robot, and tape device, and then recreate it with the  
> Networker jbconfig command.
>
> The jbconfig command detects the Qualstar, and then detects /dev/ 
> sg3 as the tape device. Now Networker can use this device to move  
> tapes around in the robot, but not to read and write. So I have to  
> delete /dev/sg3 from the Networker configuration, and then add /dev/ 
> nst0. And then it works (for a while).
>
> So I'm wondering, why the software is setting me up with /dev/sg3  
> instead of /dev/nst0; and is there anything I can do about it.  
> Bonus question if anyone else had a similar issue.
>
> Thanks,
> Tony Schreiner
> Boston College
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