On 19/04/12 17:10, John Drescher wrote: > Bacula defaults to fixed blocks of ~ 64K. This will work with all LTO > drives but can be suboptimal in performance. You can change the block > settings in bacula-sd.conf however I believe that will make all tapes > that were written with the 64K blocks unusable without you manually > erasing the tape. I am stuck on 64K blocks for my LTO2 drive for that > very reason.
as far as I've been able to tell from tests, you can't mix block sizes on one tape, however small block sizes continue to be readable for restores after changover and they will be written with large block sizes after being relabelled IE: The only requirement is to close off all open volumes before changing block size. "Can be suboptimal" is an understatement - especially on LTO4-5. LTO has supported 16Mb blocks since LTO2 but bacula only writes up to 2Mb - even that gives a big speed boost over 64k - which is ok for DATs but nothing faster than that. > > John > > ------------------------------------------------------------------------------ > For Developers, A Lot Can Happen In A Second. > Boundary is the first to Know...and Tell You. > Monitor Your Applications in Ultra-Fine Resolution. Try it FREE! > http://p.sf.net/sfu/Boundary-d2dvs2 > _______________________________________________ > Bacula-users mailing list > Bacula-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/bacula-users > ------------------------------------------------------------------------------ For Developers, A Lot Can Happen In A Second. Boundary is the first to Know...and Tell You. Monitor Your Applications in Ultra-Fine Resolution. Try it FREE! http://p.sf.net/sfu/Boundary-d2dvs2 _______________________________________________ Bacula-users mailing list Bacula-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bacula-users
