[Pacemaker] drbd diskless -> failover to other node

[Florian Haas]

On 2010-08-27 11:08, jimbob palmer wrote:
>> Which means you're causing a service interruption when you don't need
>> to. Instead, your application could continue running on the same node,
>> DRBD will ensure that the application transparently writes to and reads
>> from the peer when it thinks it's writing locally, and you can coolly
>> hot-swap the drive out from under DRBD, and resync.
>>
>> Usually service interruption is worse that degraded performance. Would
>> you rather fail over automatically, perhaps during peak hours and under
>> full load (which is what you are headed for), or would you rather have
>> your app continue to run where it is, to then switch over at a time of
>> your choosing?
> 
> Are you saying that if a server loses its disk, it will transparently
> write to the secondary server without any need to failover at all?

Yes. As long as it still has a network connection to the peer, of course.

> WOW. I never knew DRBD did this. This is a _fantastic_ feature :)

Well, that's what diskless mode is really all about.
http://www.drbd.org/users-guide/s-handling-disk-errors.html

Cheers,
Florian

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