Data Compression Tape

[Omar_43]

hi how can I enable “"Data Compression Tape Drive”
when I see in sam tape drives
my type don´t say "Data Compression Tape Drive”
and of course I can not record more that the 20 GB in a DDS4 I am working in hp-ux 11

Omar

[A. Clay Stephenson]

Simply look for the tape device nodes that have "BEST" included in the name or the shorter versions of the device nodes that have the same major/minor device number tuples corresponding to the "BEST" devices.

Now, the capacity of a DDS4 is 20GiB and that is the only value that can be trusted. Typically a 2:1 compression ratio is assumed which will yield a 40GiB capacity but that is entirely dependent upon the actual data.

[Omar_43]

with a tar in the same server I can backup 30 gb in a DDS3 but I just add the dds4 but I can not save more of 20 gb what I have to review the server is one n4000

thanks for your help


omar

[A. Clay Stephenson]

In that case, if HP-UX 11 means 11.0 then try installing patch PHKL_29898; if your version is not 11.0 then search for the latest stape patches for your OS version.

Bear in mind that the compression might be disabled by a jumper setting on the drive itself.

[Omar_43]

yes I have 11.0 let me install that patch

thanks

Omar