Re: BDsync: Block Device sync

2012-07-10 Thread Rolf Fokkens
Thanks for your feedback, I'm aware of the potential dataloss. So far however in my experience (Linux, ext4) systems recover very well from unforseen shutdowns, especially if the application software (like Oracle databases) also addresses this. I could have the VM's use data=journal to further

Re: BDsync: Block Device sync

2012-06-29 Thread Henri Shustak
> 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. Maybe... It will depend what you are backing up. Some things may be fine with having the power plug pulled out, while others may not. I would not count on it just be

Re: BDsync: Block Device sync

2012-06-27 Thread Rolf Fokkens
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

Re: BDsync: Block Device sync

2012-06-27 Thread Karl O. Pinc
On 06/27/2012 08:48:30 AM, Karl O. Pinc wrote: > 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 >

Re: BDsync: Block Device sync

2012-06-27 Thread Karl O. Pinc
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

BDsync: Block Device sync

2012-06-27 Thread Rolf Fokkens
Hi! 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 binar