[DRBD-user] transmission protocol / change without shutting down the disks

Oliver Welter mail at oliwel.de
Sun Sep 28 11:14:39 CEST 2008

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


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Hi All,

I used drbd 0.7 a while with protocol B which did fine.

I migrated the servers and due to the comment in the sample config, that
currently C is considered faster than B, I switched to C but now get
extreme iowaits even in really low load situations.
The system is a dual CPU AMD Quad Opteron and system load raises to >15
and I get 80% waits. DRBD runs over a low latency (~0.1ms) Gigabit Link.

I now wanted to switch the system to protocol B or even A, is there a
way to do so without shutting down the disks? I have a total of 8 drbd
devices on the box.

TIA

Oliver
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