[DRBD-user] replication link stability

Lionel Sausin ls at numerigraphe.com
Fri Feb 17 10:08:11 CET 2012

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.


> (...) I would suggest looking at DRBD Proxy instead, as it is designed to
> run over slow/unstable links, but it is asynchronous, so be advised that
> consistency is not always guaranteed.
>
For what I know of drbd-proxy, consistency is in fact guaranteed, though 
the secondary node may of course be out of date.
However, the proxy is probably more expensive than buying a pair of GigE 
adapters and having a specialist install the cable.

We've been running DRBD for a year over wimax (60Mb/s full duplex) 
without a proxy and it was  slow and reacted very badly to the natural 
unreliability of the link.
We ended running disconnected most of the time, and synchronizing in 
off-peak time but even that flawless.
A few years ago the docs used to advice against using even a switch 
between the nodes...
So get as good a network as you can for DRBD.

Lionel Sausin.



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