DDS

[Nobody's Hero]

I want to select a tape device that uses max compression. which device should I choose.

c4t0d0BEST
c4t0d0BESTnb
c4t0d0DDSb
c4t0d0DDSn
c4t0d0DDSnb
c5t0d0BEST
c5t0d0BESTb
c5t0d0BESTn
c5t0d0BESTnb

[Vicente Sanchez_3]

Hi,

I'd use c4t0d0BEST or c5t0d0BEST

Regards, Vicente.

[Leif Halvarsson_2]

Hi
It seems as you have two drives.

Select xxxBEST in normal cases (AT&T rewind)

xxxBESTn is AT&T norewind

and those files ending with b is Berkely style.

[John Palmer · Accepted solution]

Hi,

BEST is normally best. However, you may want to check the device file minor numbers. They should be something like:
0x040000 c4t0d0BEST
0x040080 c4t0d0BESTb
0x040040 c4t0d0BESTn
0x0400C0 c4t0d0BESTnb

Note that the 040 part identifies the address of the tape drive and that the three remaining hex numbers are flags.
080 (binary 00001000000) = Berkeley
040 (binary 00000100000) = No rewind
Provided the last digit is a zero then the drive will use max compression. See man 7 mt for more information.

Regards,
John