- either stop bacula or release the tape drive

- mt -f /dev/nstxxx rewind

-mt -f /dev/nstxxx weof 2

...



On 06/02/2017 09:59 PM, Ivan Adzhubey wrote:

Hi,

Can a tape written by Bacula with one MaximumBlockSize value be reused after
changing MaximumBlockSize to a different value? I mean, not the data on the
tape, I understand all data will be lost, but can the tape itself be relabeled
and then used with a different block size configured?

The reason I am asking is the following recent post from Kern Sibbald saying
you will not be able to reuse tapes written with a different block size after
you change it:

https://sourceforge.net/p/bacula/mailman/message/35871159/

1. Is it safe (Bacula 7.XX) to set the block size to something other
than 64K?

Yes.  However, once you have written a tape with a given block size, you
cannot changed the block size unless you re-initialized the tape.

What does "re-initialize" means here? I thought you cannot re-initialize a LTO
format tape because of the servo tracks which are hardwritten during
manufacturing.

Thanks,
Ivan

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