Hello,
If I am not mistaken, the RAIT code in Amanda was taken from code
written long ago by CERN. That code was mainly for speed rather than
redundancy.
Writing to multiple simultaneous devices has always been on the projects
list for Bacula, however, until recently it has never been a priority
since there are alternatives such as Copy jobs. Admittedly Copying is
not as good as writing two simultaneous streams for certain applications.
As the multiple simultaneous writing code is now more important, I hope
to see it implemented in the not too distant future.
Best regards,
Kern
On 1/31/20 4:25 PM, dmaziuk via Bacula-users wrote:
On 1/31/2020 3:33 AM, Radosław Korzeniewski wrote:
Amanda had "RAIT" since forever.
If you would be so kind and have an idea how it could be implemented in
bacula and so kind to describe it on this list it would be
implemented by
developers.
I don't have any idea how it could be implemented *in bacula* since I
never looked at any bacula code.
In general sending the same stream of bytes to two different places
instead of one is not exactly rocket science. I guess it and can be
implemented in several places, e.g. special storage inside SD, or two
different SDs.
I would probably send to two SDs at once because it allows for more
flexible setups: the 2nd SD can write to "the cloud", it can be on the
off-site box, etc. Whereas amanda-style RAIT device only protects
against single disk/tape failure.
Dima
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