[DRBD-user] protocol D: non blocking, async protocol?

Tomasz Chmielewski mangoo at wpkg.org
Fri Jan 16 15:52:59 CET 2009

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

Of course there is no such thing as protocol D in DRBD.

Currently, local writes are only as fast as data reaches the remote side 
(plus some TCP buffer tuning with protocol A, which won't make a big 
difference in a long term).

This can be a bit of pain if you:
- have a slow link,
- want to use DRBD for disaster recovery mainly, not for (fast) failover,
- have lots of gigabytes to sync,
- want the writes to happen fast.

I was wondering if a non blocking, async protocol was ever considered in 
So that local writes would be almost as fast as a local media allows; 
anything which was not transferred to the remote side would be marked as 
"dirty" and transferred when the time/bandwidth/conditions permit.

Tomasz Chmielewski

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