On Thu, 2015-12-03 at 23:15 +1300, martin f krafft wrote: > also sprach Hanspeter Kunz <hk...@ifi.uzh.ch> [2015-12-03 21:42 > +1300]: > > In my opinion, a clean, easy and efficient way to have a BackupPC > > mirror is to use some disk-mirroring as drbd. with this you can > > avoid > > to run backups twice on the clients (one for master backup, another > > one > > for the secondary backup). of course, for this you need the same > > amount > > of disk space on the second backupPC server. but disk is cheap, and > > if > > the data is worth it, I would always spend the money. Probably you > > can > > raise such money from the people that own that data stored on your > > machines (which includes me ;). > > How does drbd perform across remote links?
depends on the link ;) but in my experience, the bottleneck is more likely to be the disk than the network, at least concerning throughput. Remember: drbd only transfers blocks that are *written*, but during a backup, because you compare old and new content, you have a substantial amount of read requests. therefore, the disks are more likely to be the bottleneck. but this of course also depends on the speed of your disks/disk array. if you have a high latency between primary and secondary backup, then you can use drbd also asynchronously. best, hp
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