Hello, pt., 19 kwi 2019 o 19:24 Dimitri Maziuk via Bacula-users < bacula-users@lists.sourceforge.net> napisał(a):
> On 4/19/19 11:56 AM, Radosław Korzeniewski wrote: > > > When you implement Bacula in the shared storage cluster, you can failover > > backup service from node to node in any direction in just a seconds. Your > > shared storage cluster can do it for you automatically as soon as it > check > > that a service is unavailable. > > ...as long as you are not actually using it, as in you don't have a > backup running. > > When you fail over during (per Murphy's Law: 99% into) a running backup, > the above is no longer entirely correct. You have to restart the backup, > from scratch, at a different point in time, and probably having wasted > the tapes written by this point as well. > When your Bacula server crash or become unavailable you "... have to restart the backup, from scratch, at a different point in time, and probably having wasted the tapes written by this point as well ... " but you have no available replacement and all your future backups scheduled after an outage will not execute at all. > > If you define your service as "having a usable backup, on schedule", you > can't fail that service over "in seconds". > > No, you cannot define your service like that. Having a "usable" backup cannot be proved until tested. So it has a lot of other implications as well. > Don't get me wrong, I have any number of HA pairs that work exactly as > you describe, with configs, spools, and upload areas on DRBD, and so on. > Just not bacula. > I'm not forcing anybody to use cluster HA solution for his backup system. >From one point of view it is a waste of money. But from the other point of view it is a justified insurance. Everyone have to choose what he needs and can afford it. But the High Availability is not the same as Disaster Recovery solution. Having HA is not the same in any function as having DR. best regards -- Radosław Korzeniewski rados...@korzeniewski.net
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