Hello, pt., 31 sty 2020 o 16:27 dmaziuk via Bacula-users < bacula-users@lists.sourceforge.net> napisał(a):
> 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. > I do not want you to know anything about Bacula source code when I asked about functionality description. It is a pure architecture description which developers could implement. > In general sending the same stream of bytes to two different places > instead of one is not exactly rocket science. Well, I do not want to dive deeper into discussion how rocket science or not it is... > I guess it and can be > implemented in several places, e.g. special storage inside SD, or two > different SDs. > This is the exact discussion I could make. What is better - two distinct SD which do not know anything about each other and FD just sends two concurrent data streams to both (or any multiple number of SD when we implement chunking or erasure code) or special kind of SD which handles redundancy internally syncing data to other SD synchronously. > > I would probably send to two SDs at once because it allows for more > flexible setups: And by default lower the backup speed twice. > 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. > So, why not to design a special kind of SD which will get data from FD and then save it on different backend SD synchronously defining full and flexible RAIT or EC solution? This is a kind of help I want to get from community as you always complain about decisions which developers take himself. best regards -- Radosław Korzeniewski rados...@korzeniewski.net
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