[Pacemaker] A question and demand to a resource placement strategy function

[Yuusuke IIDA]

Hi, Andrew

I want to disperse using a resource placement strategy function of Pacemaker-1.1
in the fail-over point of the resource in N to N environment.

After testing a function by the following setting, there was the pattern that
the dispersion of the resource was not carried out.
* 1ACTIVE: 2PASSIVE
* placement-strategy=balanced
* capacity of 2PASSIVE is a tie score

* Initial state
Online: [srv-b1 srv-b2 srv-a1]
Full list of resources:
main_rsc1 (ocf::pacemaker:Dummy): Started srv-a1
main_rsc2 (ocf::pacemaker:Dummy): Started srv-a1
main_rsc3 (ocf::pacemaker:Dummy): Started srv-a1

# crm configure ptest utilization
Utilization information:
Original: srv-b2 capacity: capacity=3
Original: srv-b1 capacity: capacity=3
Original: srv-a1 capacity: capacity=3
calculate_utilization: main_rsc1 utilization on srv-a1: capacity=1
calculate_utilization: main_rsc2 utilization on srv-a1: capacity=1
calculate_utilization: main_rsc3 utilization on srv-a1: capacity=1
Remaining: srv-b2 capacity: capacity=3
Remaining: srv-b1 capacity: capacity=3
Remaining: srv-a1 capacity: capacity=0

* When it is dispersed definitely
When I produced trouble in a resource in order of next, I disperse and am placed
in the node that the remainder of capacity has a big.

main_rsc1 -> main_rsc2 -> main_rsc3

Online: [srv-b1 srv-b2 srv-a1]
Full list of resources:
main_rsc1 (ocf::pacemaker:Dummy): Started srv-b1
main_rsc2 (ocf::pacemaker:Dummy): Started srv-b2
main_rsc3 (ocf::pacemaker:Dummy): Started srv-b1

# crm configure ptest utilization
Utilization information:
Original: srv-b2 capacity: capacity=3
Original: srv-b1 capacity: capacity=3
Original: srv-a1 capacity: capacity=3
calculate_utilization: main_rsc1 utilization on srv-b1: capacity=1
calculate_utilization: main_rsc2 utilization on srv-b2: capacity=1
calculate_utilization: main_rsc3 utilization on srv-b1: capacity=1
Remaining: srv-b2 capacity: capacity=2
Remaining: srv-b1 capacity: capacity=1
Remaining: srv-a1 capacity: capacity=3

* When it is not dispersed well
When I produced trouble in a resource in order of next, I am partial, and the
resource is placed in one node.

main_rsc3 -> main_rsc2 -> main_rsc1

Online: [srv-b1 srv-b2 srv-a1]
Full list of resources:
main_rsc1 (ocf::pacemaker:Dummy): Started srv-b1
main_rsc2 (ocf::pacemaker:Dummy): Started srv-b1
main_rsc3 (ocf::pacemaker:Dummy): Started srv-b1

# crm configure ptest utilization
Utilization information:
Original: srv-b2 capacity: capacity=3
Original: srv-b1 capacity: capacity=3
Original: srv-a1 capacity: capacity=3
calculate_utilization: main_rsc1 utilization on srv-b1: capacity=1
calculate_utilization: main_rsc2 utilization on srv-b1: capacity=1
calculate_utilization: main_rsc3 utilization on srv-b1: capacity=1
Remaining: srv-b2 capacity: capacity=3
Remaining: srv-b1 capacity: capacity=0
Remaining: srv-a1 capacity: capacity=3

I think that this problem occurs by difference in order of handling of resource.
I attach hb_report when a problem occurred.
Is this movement a bug?
Or does my setting make a mistake of any?

Best Regards,
Yuusuke IIDA
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Yuusuke Iida
Mail: iidayuus at intellilink.co.jp
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