It's almost obvious if you look at possible medium states but to give
you a verbose answer - the media can be read from any point but can only
be appended at the end.
So if any job is being pruned/purged/deleted, it's just being
"forgotten" by the database but is still present on the media where it
originally was.
Oversimplifying a bit - a media life cycle is:
Purged -> Recycled -> Append -> Used/Full -> Purged again.
So, as you can see, there is no (de)fragmentation. A volume is getting
appended to, then it's getting recycled. Simple as that.
With disk-based storage it's getting a bit more complicated with
dynamicaly created volumes, single-job volumes and auto-truncate on purge.
On 26/12/2020 17:18, 'Frank Cherry' via bareos-users wrote:
Hi there,
a question how Bareos managed space on tape:
Hypothetc:
On a LTO tape are stored in this order 3 jobs:
1: 3 TB
2: 2 TB
3: 1 TB
Job 1 is deleted.
Now a new job is queued, the spooling file has a size of 2 TB.
Will now the SD despool it
a) on position 4 of the tape (append) [this is what I think]
or
b) replace position1 because the is availabe space
So, thinking about fragmentation would be one part of a backup
strategy when working with tapes.
Thanks and all the best, Frank
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