My customer has been using remotely backup for years with 3-node setup
but without DRBD Proxy AND DRBD>8.3.2 its usage was restricted.
Recently it introduced both and remote replication became possible and
it works greatly with effective 10Mbps line and avarage round trip time
(measured by ping) 0.8ms.
The subject says it all, is DRBD replication possible
between two nodes at different geographical locations ?
If your WAN line has very good quality (broad bandwidth and low latency
--- round trip delay) AND storage size is not so large AND protocol A is
adequate, no DRBD Proxy would be required.
DRBD Proxy can compress packet contents and it offers large buffer.
If your storage size is large (my customer's case: 1TB) when connection
is made first phase of DRBD (exchanging bitmap) took more than few
minutes and during this phase all disk write is suspended with DRBD <
8.3.2. Using use-rle option (DRBD>=8.3.2) it shortened to less second!
Best Regards,
Motoharu Kubo
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