Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
We have a large number of xen servers with virtual hosts running mostly Debian lenny, with 184.108.40.206 kernels from xensource. Recently we've been experimenting with pacemaker, as a result of some split brain problems caused on some of our old heartbeat drbd servers. Since this problem can be reproduced using drbd alone, without involving pacemaker, I'll just concentrate on that part of the software: Kernel: linux 220.127.116.11-xen version 3.4.0, from xensource also with an older version of 18.104.22.168-xen from xen Xen hypervisor: version 3.2.1, from Debian sources drbd: version 8.3.4-12 from git.drbd.org also with version 8.3.4-1 from Debian sources 64-bit architecture The symptom: installed drbd, edited configure file, and ran drbdadm create-md r0 drbdadm attach r0 drbdadm syncer r0 drbdadm connect r0 on each machine. No problems. Then ran drbdadm -- --overwrite-data-of-peer primary r0 This started to sync the 20-gb disks, and continued until about 5% of the disk was synced. Then the xen dom0 rebooted. The problem is reproduceable. I see there have been other problems reported of kernel panics during syncronisation. Is this likely to be the same problem? Is there a fix? Owen Le Blanc University of Manchester