-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 09/20/2013 03:43 PM, Alan Brown wrote: > On 20/09/13 13:22, Andreas Koch wrote: >> >> Many thanks for the data point! When we use Bacula (not just btape) >> with larger block sizes (512 KB), our backups abort when bacula fails >> to read the tape's header block. >> > > Did you attempt to mix blocksizes on the same physical tape?
No. I initially tried writing with 512 KB to our existing tapes for differentials (that were written on LTO-4 drives onto the same tapes, also with 512 KB). > That will not work. If you change block sizes all existing tapes holding > data must be marked "used" and new ones labelled. That was my second attempt: Freshly labelled tapes. All tries with 512KB failed as described previously, only 128 KB succeeded. As with btape, the problem with the larger block sizes did not come up during writing, but during reading. This lead to all backups failing, since Bacula appears to read the on-tape header block before writing the actual backup. > I run 2Mb block size quite happily on HP LTO5 drives and have done for a > few years. They are capable of 16Mb - we are limited to 2Mb by Bacula. Hmm, curiouser and curiouser! I'll wait and see whether btape gets fixed to accept the larger block sizes and then proceed to run more tests. Many thanks for all the feedback! Best, Andreas -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.14 (GNU/Linux) Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iEYEARECAAYFAlI8VUAACgkQk5ta2EV7Dox3tgCeKa3jVjtuyr5RX98yysxCD3vh bY8AoIwuGwOF18i+yMKnyn13Eu+4WmW2 =Auzt -----END PGP SIGNATURE----- ------------------------------------------------------------------------------ LIMITED TIME SALE - Full Year of Microsoft Training For Just $49.99! 1,500+ hours of tutorials including VisualStudio 2012, Windows 8, SharePoint 2013, SQL 2012, MVC 4, more. BEST VALUE: New Multi-Library Power Pack includes Mobile, Cloud, Java, and UX Design. Lowest price ever! Ends 9/20/13. http://pubads.g.doubleclick.net/gampad/clk?id=58041151&iu=/4140/ostg.clktrk _______________________________________________ Bacula-users mailing list Bacula-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bacula-users
