Hi ALL,
I have been working on bug 1414432 [1] recently, I would like do more
discussion before further work.
I'm talking about libvirt driver( maybe fit for other hypervisor), there
are two kinds of storages which are used for instance's root_disk.
1) non-shared storage on each compute nodes
2) shared storage between compute nodes
2.1 shared instance_path and root_disk (shared everything ike NFS)
2.2 shared root_disk without shared instance_path (shared volume
backend like ceph)
Current we check if shared storage or not in concrete actions like
live-migration, evacuate, these need pass instance as argument,
I think the value of hared storage or not should base on compute node,
should not base on instance.
So do we need new nova configuration option to show compute nodes with
shared_storage or not ?
benefits:
1) Don't need check for each instance while taking action
2) Can handle similar bug easily like [1] from API level.
If yes,
some thing like, compute-node-storage-type= [ non-shared | shared-all |
shared-volume ] or part-shared
In order to support some compute nodes with shared_storage, and others
doesn't in one OpenStack development,
another configuration shared_storage_compute_nodes =[node3, node5]
Any thoughts ?
[1]https://bugs.launchpad.net/nova/+bug/1414432
--
ChangBo Guo(gcb)
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