[Pacemaker] Manual promote/demote and time between demote and promote

[Andrew Beekhof]

On Wed, Jul 29, 2009 at 4:45 AM, hj lee<kerdosa at gmail.com> wrote:
> Thank you very much for your reply.
>
> When I use the heartbeat stack, it takes 3 sec. In the same environment, it
> takes less than 1 sec with OpenAIS stack.

Wow, that is quite surprising.
Good reason to use OpenAIS then :-)

> I am using RHEL 5 rpms from
> Pacemaker and Pacemaker 1.0.4. Did any body measure the time takes from
> demote to promote on both stacks? I wonder whether other people have the
> same result or not.
>
> Thanks
> hj
>
> On Tue, Jul 28, 2009 at 2:26 AM, Andrew Beekhof <andrew at beekhof.net> wrote:
>>
>> > 2. By using co-location constraint, the time takes from demote to
>> > promote is
>> > around 3 sec(when notify is enabled) and 1 sec (when notify is
>> > disabled).
>> > For mission critical application, I think a downtime of 1 or 3 sec is
>> > too
>> > long. How can I minimize this transition time?
>>
>> Its purely down to your network and what the resource is doing during
>> the promote/demote and notify actions.
>
>
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