> Would these two operations be equivalent?:
>
> 1. mt -f /dev/nst0 compression 0
> tar cvf /dev/nst0 /tmp/dir
>
> 2. tar cvf /dev/nst0l /tmp/dir
Probably. I'm not a linux expert (more Solaris), so the idea of
defining compression with mt surprises me, but it seems consistent.
> Of course, that works for tar, or maybe NetWorker via the CLI wherein
> you're specifying '-f /dev/device_name', but if you wanted, for
> whatever reason, to temporarily use no-compress with NetWorker via the
> GUI instead, then first running the mt command to toggle the
> compression on or off as needed would make more sense because otherwise
> you'd have to reconfigure the jukebox every time you wanted
> to switch back and forth between the stinit.def mode 1 devices
> (/dev/nst#) and the mode 2 devices (/dev/nst#l). That right?
I suppose. I've never tried to disable compression for networker's use
temporarily.
> Seems it would make more sense if they just made the darn modes 0-3 for
> stinit.def, too, but maybe its akin to a 30 slot tape
> library wherein the library numbers its slots 0-29, and the software
> sees it as 1-30.
Probably written by two different developers at different times.
Solaris also has 4 modes, but the unflagged device is not a separate
mode, it just points at one of the flagged devices based on data in the
st.conf. Also, the Solaris modes usually run in the other direction (l,
m, h, u/c for low, medium, high, and ultra or compressed).
--
Darren Dunham ddunham AT taos DOT com
Senior Technical Consultant TAOS http://www.taos.com/
Got some Dr Pepper? San Francisco, CA bay area
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