Hmm What is the default block size for bacula 9 ? I am assuming it's what Kern said due to his authority in the project.
Can one change in on a current production system or its something you set on initial setup only? William ________________________________ From: fk+bacula--- via Bacula-users <bacula-users@lists.sourceforge.net> Sent: April 21, 2021 10:20 AM To: bacula-users@lists.sourceforge.net <bacula-users@lists.sourceforge.net> Subject: Re: [Bacula-users] LTO-7 btape speed test CAUTION: This email originated from outside of the organization. Do not click links or open attachments unless you recognize the sender and know the content is safe. Thanks Kern, I will ask Quantum about the best setting for the Block Size. The file size I have set to 20 GB at the moment. Thanks, Frank Am 21.04.2021 um 12:09 schrieb Kern Sibbald: >From my experience (up to LTO-5), using 524288 as a block size is a reasonable >size. However LTO-7 drives are even faster, so you might try some tests with >Maximum block size = 1048576. Some people recommend much larger sizes, but in >my tests (LTO-5) there is little speed gain with even bigger block sizes, and >according to a Quantum technical tape specialist, you might experience more >errors. Also you should set Maximum File Size = 5G or bigger. This determines how often Bacula writes EOF marks, which really slow down writing. The bigger Maximum File Size is the faster (in general) Bacula can stream to tape. However, if you set it too big it will take longer to get a single file back. Bacula can position quickly to a block boundary but must search within a block for any given file. If you are restoring everything, then Bacula will only have to search on the first file to be restored -- all the rest of the files will be found sequentially.
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