Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
In case it helps anyone...
I've had some extremely strange behavior out of drbd under Xen usually
resulting in the two nodes losing contact with one another and never
re-establishing it.
I tried a great many things in an effort to track this down but found
only one thing which helped; rate limiting the domU virtual network
interfaces.
I use something like this:
vif = [ 'rate=20MB/s, bridge=xenbr0',
'rate=20MB/s, bridge=xenbr1' ]
Once I introduced this change everything has been fine for a very long
time now.
And when I say I tried 'a great many things' I really mean that... from
sysctl settings, network interface settings on the physical interfaces,
tcp checksum offloading etc etc. The vif rate limitation was the only
thing that made any difference at all. And what a difference it made.
Mickaël Canévet wrote:
> I don't have any cluster infrastructure like RedHat Cluster suite or
> Heartbeat or whatever, just 2 servers with Xen kernel and DRBD
> replication for devices. I don't understand what can makes my servers
> reboot...
>
> On Thu, 2008-10-09 at 13:44 +0200, Ante Karamatic wrote:
>> On Thu, 09 Oct 2008 12:33:28 +0200
>> Mickaël Canévet <canevet at embl.fr> wrote:
>>
>>> My two nodes has just rebooted when I unplugged the dedicated network
>>> link for replication.
>> A month or two ago I talked with a guy with the same problem. At the
>> end, it wasn't drbd (since drbd can't do that), but cluster
>> infrastructure, which was rebooting nodes over ilo or some other device
>> (smart power supplies, etc...).
>>
>> I'd put my money on cluster infrastructure.
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