topic Re: Info on tape device path in Operating System - HP-UX

Info on tape device path

Kennethyap — Thu, 09 Dec 2004 02:12:10 GMT

Dear Experts,
What's the meaning of all the tape device path usage ? Compress, un-compress?

/dev/rmt/0m /dev/rmt/c6t1d0BESTn
/dev/rmt/0mb /dev/rmt/c6t1d0BESTnb
/dev/rmt/0mn /dev/rmt/c6t1d0DDS
/dev/rmt/0mnb /dev/rmt/c6t1d0DDSb
/dev/rmt/c6t1d0BEST /dev/rmt/c6t1d0DDSn
/dev/rmt/c6t1d0BESTb /dev/rmt/c6t1d0DDSnb

Re: Info on tape device path

Stf — Thu, 09 Dec 2004 02:27:25 GMT

When you have a "n" : no rewind

"b" means berkeley-style tape behavior, without "b" : AT&T-style behavior

BEST means that the highest-capacity density format will be used, including data compression, if the device supports compression

DDS : selects one of the known DDS formats; can be used to specify DDS1 or DDS2, as required.

Stf ;-)

Re: Info on tape device path

Bharat Katkar — Thu, 09 Dec 2004 02:35:00 GMT

Hi Kennethyap,
You can also get detail about that particular device by doing lssf.
For e.g.

# lssf /dev/rmt/c6t1d0BESTn
# lssf /dev/rmt/c6t1d0BESTnb
....

It will give you all the device details.
Hope that helps.
Regards,

Re: Info on tape device path

Kennethyap — Thu, 09 Dec 2004 02:37:09 GMT

what is means berkeley-style tape behavior, & AT&T-style behavior
? What's to be use ?

Re: Info on tape device path

Stf — Thu, 09 Dec 2004 03:10:49 GMT

look at this :

http://c2.com/cgi/wiki?UnixOperatingSystems

It's 2 sources of unix different, for example SUN uses berkeley style whereas HP uses AT&T style.

In fact this is 2 university different that made it UNIX code...

Stf ;-)

Re: Info on tape device path

Hoang Chi Cong_1 — Thu, 09 Dec 2004 04:39:34 GMT

Hi Kennethyap

See on the attachement.
You can understand more about unix device.

Best and regard,

Jimkery