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Re: OpenStack API, Reservation ID's and Num Instances ...


2011/5/23 Mark Washenberger <mark.washenberger@xxxxxxxxxxxxx>:
> If I understand the features correctly, their implementation in nova seems straightforward. However, I am still a little curious about their necessity. For load balancing, what is the difference between a single request for N instances and N requests for a single instance each?

Scheduling. If you ask for 10 instances in one call, they're scheduled
as a set. The entire call either fails or succeeds and all the
instances land in the same availability zone. 10 individual requests
will cause each of the instances to be scheduled individually (partial
failures and being scattered across multiple availability zones being
the major problems).

Soren Hansen        | http://linux2go.dk/
Ubuntu Developer    | http://www.ubuntu.com/
OpenStack Developer | http://www.openstack.org/