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https://issues.apache.org/jira/browse/CLOUDSTACK-7641?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wido den Hollander closed CLOUDSTACK-7641.
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Resolution: Fixed
Merged into master
> 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
> Labels: ceph, libvirt, rbd
> 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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