Files that are written to B2 should be OK, assuming they were written
without error to begin with. B2's object (rather than hierarchical)
storage only allows for writing the entire file at once and is not block
storage. There should be no partial files. If the write fails, then the
file won't be there at all. This is also why it cannot be mounted, in
the traditional sense. There has to be a layer that uses local block
storage to cache all of the block writes and then when the local block
storage file is closed, upload the completed file to B2.
I see no reason the vchanger/OpenDedup method wouldn't work. The problem
I have with it is that each write to a volume file creates a new version
of that volume file. The old versions would not be in sync with the
Bacula catalog's idea of what is on that volume, so would be wasted B2
space, and in B2 the old versions have to be manually deleted. For that
reason, and because vchanger allows a dynamic and unlimited number of
slots, I would set MaximumVolumeJobs = 1 for the pools with volumes in
B2 and add and label volume files in vchanger when more are needed. Note
that there will still be at least 2 versions in B2 of each volume file,
one when the volume is labeled, then one when the data is written. The
first version with just the volume label is still wasted space, but is
small enough not to matter.
On 6/8/2019 8:14 PM, sruckh--- via Bacula-users wrote:
Next up I went with vchanger ( http://bit.ly/2E297eg ) and OpenDedup (
http://bit.ly/2ETFaxF ). In this solution I use OpenDedup to mount my
Backblaze bucket to my local file-system, and use the vchanger script
to act as my autochanger for my virtual volumes. Again, I am not 100%
I completely have a handle of the mounted SDFS (backblaze volume). For
example, it uses your local file system for speed. So I have not
tested the scenario if my local volume disappeared. I am not 100%
certain if I would be able to 100% recover using only the files
(virtual tape volumes) that are in the cloud.
_______________________________________________
Bacula-users mailing list
Bacula-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/bacula-users
