On 29/05/15 05:38 AM, DRBD User wrote: > 2556 ?
> So a Master/Slave Configuration would make no difference (without GFS2 ...) ? > I assume fencing is required too ... > > Or may be using DRBD in standalone mode ? Fencing is needed, regardless of the FS or applications on top of DRBD. This is how you properly avoid split brains. The actual fence process depends on communicating with external devices, asking them to do something, waiting for that to be done and confirming success. Even the fastest fence devices take time. In my experience, you will want two fence methods, for proper resiliency, and this means that a failure in the primary fence method (ie IPMI) can take ~5 seconds to detect, then you start the fence process over on the backup fence method (ie PDUs). The fastest fence method I've used is APC/Schneider brand AP7900 switched PDUs. They tend to fence and confirm in a couple of seconds. However, relying on them alone makes the failure of the PDU cause fencing to fail entirely if it is needed later, leaving your cluster blocked (exactly why I recommend dual fence methods). -- Digimer Papers and Projects: https://alteeve.ca/w/ What if the cure for cancer is trapped in the mind of a person without access to education? _______________________________________________ drbd-user mailing list [email protected] http://lists.linbit.com/mailman/listinfo/drbd-user
