Ah, OK (mt shows compression on FreeBSD). You could try tapeinfo (part of the mtx package). I think you need to have a tape loaded to make it work.
__Martin >>>>> On Wed, 14 Feb 2018 14:47:59 +0000, Adam Weremczuk said: > > Hi Martin, > > This is what I'm getting from the command: > > mt -f /dev/nst0 status > SCSI 2 tape drive: > File number=0, block number=0, partition=0. > Tape block size 0 bytes. Density code 0x46 (LTO-4). > Soft error count since last status=0 > General status bits on (41010000): > BOT ONLINE IM_REP_EN > > So compression is not mentioned here, just density code which is > something different. > > I looked into "mt compression" and "mt datacompression" commands but > both don't seem to have a view or status mode. > > Even when executed without a parameter they enable compression: > > https://wiki.zmanda.com/index.php/Hardware_compression > > So I'm reluctant to take the risk with our main backup system which I'm > still learning how to use. > > Any ideas? > > Thanks > Adam > > > On 09/02/18 18:32, Martin Simmons wrote: > > Possibly "mt status" will show whether hardware compression is enabled? > > > > If you are getting close to 1.6TB per LTO-4 tape (according to JobBytes) > > then > > I think hardware compression must be enabled. > > > > The mt command also allows you to control compression (I'm not sure if you > > can > > change it in the middle of writing to a tape though). > > ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Bacula-users mailing list Bacula-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bacula-users
