On Monday 18 September 2006 03:37 am, Arno Lehmann wrote: > On 9/18/2006 6:30 AM, Michael Brennen wrote: > > It appears that the only way to turn off hardware tape compression > > is to have RunBeforeJob execute a script that turns off h/w tape > > compression with 'mt'. I did not see in either released or > > development documentation that there is a %? substitution for the > > tape device to be used for the Job about to run; for an autochanger > > this would allow turning off compression on just the drive to be > > used. Is that perhaps available but undocumented? > > To my knowledge - which covers DDS and DLT drives under linux better > than other combinations - compression is usually enabled on a > per-tape-basis. > > Meaning that, once the drive encounters a tape with compressed data on > it, it will continue compressing data. > > You have to turn of compression before writing the first blocks of data > to any tape to disable compression. What you set with mt is more or less > only the default mode for new tapes loaded into the drive.
That occurred to me sometime in the middle of the night, but only for tapes to which Bacula had already written data. I had not seen the implications that Bacula having labeled a tape in compressed mode precludes ever writing uncompressed data to it. So, it seems that using encryption with Bacula changes the way that one must think about encryption. That is fine, I just had not seen it before. I am at a reasonable point to start over by relabeling everything with h/w compression off, so that is the approach I will take. Thanks much for the thoughtful followup. -- -- Michael ------------------------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ Bacula-users mailing list Bacula-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bacula-users
