topic Data Compression Tape in Operating System - HP-UX

Data Compression Tape

Omar_43 — Tue, 26 Sep 2006 13:12:53 GMT

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

Re: Data Compression Tape

A. Clay Stephenson — Tue, 26 Sep 2006 13:19:22 GMT

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.

Re: Data Compression Tape

Omar_43 — Tue, 26 Sep 2006 16:08:48 GMT

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

Re: Data Compression Tape

A. Clay Stephenson — Tue, 26 Sep 2006 16:21:19 GMT

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.

Re: Data Compression Tape

Omar_43 — Tue, 26 Sep 2006 16:33:18 GMT

yes I have 11.0 let me install that patch

thanks

Omar