On Thu, Jan 06, 2011 at 05:02:47PM +0000, Mister IT Guru wrote: > I've been trying to get my head around virtual full backups. > > Now, from my understanding, (i'm 80% through my work day, shut down 20 > tickets, and had to deal with too many user incidents for my liking, so > please bare with me if I say something stupid!), virtual fulls can be > run on the same pool as a real 'recent' full has been run on, and it > will create a new full based on all the latest files still in the pool. > It then takes these files, and only take the latest changed files, from > the client to create a new usable full backup, which should pretty much > take the same time as between and incremental and a differential. > > If this is the case, then I can slash my backup times, from 5 hours per > host, to around 20 minutes, which is something I think would be pretty > frikkin' awesome! Feel free to comment, and suggest :)
No, it doesn't take the latest files from the client. It would solve a couple of problems that I have if that is what it did though. A VirtualFull combines previous backups into a single backup that is equivalent to a Full. So, if you have a schedule like this: Monday: Incremental Tuesday: Incremental Wednesday: Incremental Thursday: Incremental Friday: Incremental Saturday: Incremental Sunday: Incremental You can't, say, just do this: Monday: Incremental Tuesday: Incremental Wednesday: Incremental Thursday: VirtualFull Friday: Incremental Saturday: Incremental Sunday: Incremental You actually have to do this, otherwise you don't get a backup for that day: Monday: Incremental Tuesday: Incremental Wednesday: Incremental Thursday: VirtualFull plus seperate Incremental Friday: Incremental Saturday: Incremental Sunday: Incremental And that means that you get into problems with the VirtualFull and Incremental overlapping and getting in each other's way. With my configuration, a VirtualFull sometimes prevents an Incremental from running, because the VirtualFull took too long (or vice versa). I have not been able to solve this, because every idea that I've come up with either doesn't work or makes something else happen that is worse. So, I would be very pleased if a VirtualFull also grabbed new files from the client. ------------------------------------------------------------------------------ Learn how Oracle Real Application Clusters (RAC) One Node allows customers to consolidate database storage, standardize their database environment, and, should the need arise, upgrade to a full multi-node Oracle RAC database without downtime or disruption http://p.sf.net/sfu/oracle-sfdevnl _______________________________________________ Bacula-users mailing list Bacula-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bacula-users
