DRBD seems a suitable alternative, but I looked into it and it seemed quiet complex. I am mostly interrested in asynchronous replication, and I'm not sure if this works in a proper way. The proper way for me means that write order is preserved for consistency reasons (explained below), and I can't figure that out. Apart from that I think I need the buffering functionality provided by DRBD proxy, which has specific licensing terms.
Although not as efficient as DRBD bdsync is very simple. And I meets my consistency requirement by applying it on a snapshot of an LVM volume, which results in a (compressed) diff file that I only apply on the destination LVM device after completion. So afterwards I always have a consistent image. The consistency is important because every LVM image is a disk image for a virtual machine. By syncing an LVM shapshot I'm sure I'm replicating a moment in time like someone pulled the power plug. I assume that the VM's can recover from that. I do agree though that DRBD may be a suitable alternative. Rolf Op 27-06-12 15:48 schreef Karl O. Pinc <k...@meme.com>: >On 06/27/2012 06:51:29 AM, Rolf Fokkens wrote: > >> After having wrestled with rsync and several patches I found a >> solution to >> synchronize block devices: BDsync. >> >> Bdsync can be used to synchronize block devices over a network. It >> generates >> a "binary diff" in an efficient way by comparing MD5 checksums of >> 32k >> blocks of block devices. This binary diff can be applied to >> "destination" >> after which the local blockdevices are synchronized. > >> >> Interrested people can download the sources from: >> http://bdsync.rolf-fokkens.nl/ > >I'm curious. Why would use use bdsync instead of drdb? > > > >Karl <k...@meme.com> >Free Software: "You don't pay back, you pay forward." > -- Robert A. Heinlein -- Please use reply-all for most replies to avoid omitting the mailing list. To unsubscribe or change options: https://lists.samba.org/mailman/listinfo/rsync Before posting, read: http://www.catb.org/~esr/faqs/smart-questions.html
