[ClusterLabs] fence_apc delay?

Dan Swartzendruber dswartz at druber.com
Tue Sep 6 12:44:22 EDT 2016

On 2016-09-06 10:59, Ken Gaillot wrote:
> On 09/05/2016 09:38 AM, Marek Grac wrote:
>> Hi,


> FYI, no special configuration is needed for this with recent pacemaker
> versions. If multiple devices are listed in a topology level, pacemaker
> will automatically convert reboot requests into all-off-then-all-on.

Hmmm, thinking about this some more, this just puts me back in the 
current situation (e.g. having an 'extra' delay.)  The issue for me 
would be having two fencing devices, each of which needs a brief delay 
to let its target's PS drain.  If a single PDU fencing agent does this 
(with proposed change):

wait N seconds

that is cool.  Unfortunately, with the all-off-then-all-on pacemaker 
would do, I would get this:

power-off node A
wait N seconds
power-off node B
wait N seconds
power-on node A
power-on node B

or am I missing something?  If not, seems like it would be nice to have 
some sort of delay at the pacemaker level.  e.g. tell pacemaker to 
convert a reboot of node A into a 'turn off node A, wait N seconds, turn 
on node A'?

More information about the Users mailing list