Wido den Hollander created CLOUDSTACK-7641:
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Summary: Do not always ask libvirt to refresh storage pools
Key: CLOUDSTACK-7641
URL: https://issues.apache.org/jira/browse/CLOUDSTACK-7641
Project: CloudStack
Issue Type: Improvement
Security Level: Public (Anyone can view this level - this is the default.)
Components: KVM
Affects Versions: Future
Reporter: Wido den Hollander
Assignee: Wido den Hollander
Priority: Minor
Fix For: 4.5.0
When getStoragePool() in the LibvirtStorageAdapter is called it asks libvirt
for information regarding that storage pool.
In the process the StorageAdapter asks libvirt to 'refresh' the storage pool.
Refreshing a storage pool means that libvirt will scan the whole pool and get
information about all the volumes which it then caches.
getStoragePool() is called for almost every storage operation in KVM and that
causes delays.
On big (RBD) storage pools such a refresh can take up to 2 or 3 minutes.
The StatsCollector in the Management Server asks all the hosts about the
storage pools as well, so we should only refresh the pool when the
StatsCollector wants storage statistics.
This way we keep the information in libvirt up to date, but we also speed up
storage tasks on KVM.
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