Comment #2 on issue 387 by [email protected]: gnt-instance failing to sync drbd
http://code.google.com/p/ganeti/issues/detail?id=387

Indeed, such topics are suited a bit better to the user ML, but it's not a big problem here either.

Looking at the dmesg outputs, node2 is behaving correctly (as SyncTarget), the problem is with node1:

[  246.920277] block drbd0: conn( WFBitMapS -> SyncSource )
[ 246.920289] block drbd0: Began resync as SyncSource (will sync 10485760 KB [2621440 bits set]). [ 246.920336] block drbd0: updated sync UUID D10F239D00C8AA4B:0001000000000004:0000000000000004:0000000000000000 [ 246.940322] block drbd0: drivers/block/drbd/drbd_receiver.c:1953: sector: 0s, size: 16777216
[  246.940432] block drbd0: error receiving RSDataRequest, l: 24!
[ 246.940536] block drbd0: peer( Secondary -> Unknown ) conn( SyncSource -> ProtocolError )
[  246.940913] block drbd0: asender terminated

Could it be that somehow DRBD and bcache don't interact correctly?

At this point, I would try to reproduce this problem without Ganeti (i.e. manually configured DRBDs), and if it still happens, forward it to the DRBD users mailing list.

Note that the way Ganeti configures DRBD, /etc/drbd* are not used.

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