volume size of file based backups

[Jon Schewe]

When using file based backups what are the reasons for setting "Maximum Volume Bytes"?

If the filesystem supports files larger than any single backup would it make sense to leave this unset and to set "Volume Use Duration" to something really small and then each volume has a single job in it?

[Brock Palen]

I find it to be manageability.
The on disk volumes sitll act like tape, so while things prune, they are effectively append only immutable. So you can only recycle them once everything on the volume ages out.

Setting size much like setting max age etc, is a way of capping unbouned appending and never recovering space.

I guess you could run into maximum filesize but I have really ran into that on enterprise NAS like Isilon having 8TB max file size. Most filesystems you would use on a direct attached system have no effective limit.


Brock Palen
bro...@mlds-networks.com
www.mlds-networks.com
Websites, Linux, Hosting, Joomla, Consulting

> On Dec 12, 2024, at 2:27 PM, Jon Schewe <jon.schew...@gmail.com> wrote:
>
> When using file based backups what are the reasons for setting "Maximum Volume Bytes"?
> If the filesystem supports files larger than any single backup would it make sense to leave this unset and to set "Volume Use Duration" to something really small and then each volume has a single job in it?
>
>

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[Jon Schewe]

Wouldn't setting "Volume Use Duration" to 1 minute ensure that the volumes stop unbounded appending?

[Sebastian Sura]

Hi Jon

what are you trying to achieve ? If you want to have one job per volume, then you should look into the option "MaximumVolumeJobs" (Dir->Pool).
See here: https://docs.bareos.org/Configuration/Director.html#config-Dir_Pool_MaximumVolumeJobs

Kind Regards
Sebastian Sura

Am 13.12.24 um 15:30 schrieb Jon Schewe:

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[Jon Schewe]

Sebastian,

Excellent question. Yes, I think I'd like to have a single job per volume. I forgot about MaximumVolumeJobs, that's likely what I want.