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

Tomasz Chmielewski mangoo at wpkg.org
Fri Jan 16 16:52:08 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.

Lars Ellenberg schrieb:

>> 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.
> yes.
> will be implemented in drbd 9.
> will NOT be available within the next few month, though.
> meanwhile,
> consider disconnecting your DR site, and connect only during off hours.
> you will get a re-sync of the changes during that time.

Great to hear that such a feature will be implemented in DRBD.

Yes, basically what I do is transferring everything during off hours. 
Over a compressed VPN link.

It's also worth to do (before the initial sync):

dd if=/dev/zero of=/bigfile
rm -f /bigfile

to zero-out any free areas - so that the VPN compression can squeeze 
some extra bytes as DRBD synchronizes "free area".

Tomasz Chmielewski

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