>>>>> On Wed, 06 Sep 2006 16:48:18 -0400, Ryan Novosielski said: > > I have a question about my DDS4 drive... > > I have been backing up a 20GB FS with a DDS4 drive for quite some time. > The filesystem has been getting increasingly full, and until recently > was only 75% or so. I've reached 95% and my backup now exceeds one tape. > The estimated backup size is 19.766GB. > > However, my DDS4 drive is reporting tapes full at roughly 17.8GB. > Hardware compression is presumably enabled (I'm writing to /dev/rmt/1cbn > on a Solaris box). I'd like to check somehow, but am not sure how to do so.
Maybe the 'mt status' shell command will print it? You need to unmount the drive from Bacula first. > I know a lot of the data is uncompressable, but wouldn't that make the > data larger (ie. the data will hit the capacity of the drive and request > a new tape), not make less fit on a tape? If the data is larger, then less fits on a tape :-) Remember that "larger" here means that the crappy expanding DDS4 compression has caused more bits to be written to the tape than were written to the drive by Bacula. Hence Bacula writes 17.8GB, which expands to more than 20GB (the tape capacity) on the tape. > Any hints for what to try here? I am formatting the tape now to make > sure that the capacity is correct (though this idea may be a holdover > from when I was using DLT's, which seemed to be forward and backward > compatible). > > If I am formatting /dev/rmt/1 instead of 1cbn, does that somehow turn > off compression? You probably want to use /dev/rmt/1bn to get the other flags correct. See man st. __Martin ------------------------------------------------------------------------- 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
