On Sat, 2016-04-23 at 15:25 -0400, Jay Pipes wrote: > On 04/23/2016 03:18 PM, Mike Perez wrote: > > On 14:54 Apr 18, Jay Pipes wrote: > >> On 04/16/2016 05:51 PM, Amrith Kumar wrote: > >>> - update_resource(id or resource, newsize) > >> > >> Resizing resources is a bad idea, IMHO. Resources are easier to deal with > >> when they are considered of immutable size and simple (i.e. not complex or > >> nested). I think the problem here is in the definition of resource classes > >> improperly. > >> > >> For example, a "cluster" is not a resource. It is a collection of resources > >> of type node. "Resizing" a cluster is a misnomer, because you aren't > >> resizing a resource at all. Instead, you are creating or destroying > >> resources inside the cluster (i.e. joining or leaving cluster nodes). > >> > >> BTW, this is also why the "resize instance" API in Nova is such a giant > >> pain > >> in the ass. It's attempting to "modify" the instance "resource" when the > >> instance isn't really the resource at all. The VCPU, RAM_MB, DISK_GB, and > >> PCI devices are the actual resources. The instance is a convenient way to > >> tie those resources together, and doing a "resize" of the instance behind > >> the scenes actually performs a *move* operation, which isn't a *change* of > >> the original resources. Rather, it is a creation of a new set of resources > >> (of the new amounts) and a deletion of the old set of resources. > > > > How about extending a volume? A volume is a resource and can be extended in > > Cinder today. > > Yep, understood :) I recognize some resource amounts can be modified for > some resource classes. How about *shrinking* a volume. Is that supported? >
[amrith] It isn't today and every other week or so (most recently this past Monday in Percona Live) I get a request for this capability :) Not saying it is easy (I know it is hard) but honestly answering the question regarding support. > Best, > -jay > > __________________________________________________________________________ > OpenStack Development Mailing List (not for usage questions) > Unsubscribe: openstack-dev-requ...@lists.openstack.org?subject:unsubscribe > http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
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