RHV: adding a Storage Domain creates significant load and some VMs are Not Responding.
Issue
- Adding a Storage Domains creates significant load on the storage
- Adding a Storage Domain makes some guests become unresponsive
- Mapping a new LUN and creating a new SD on them causes high cpu steal on some guests
- The behaviour can be observed for about 60secs inside the VM
Environment
- Red Hat Virtualization 4.x
- Data-Center (Storage Pool) already contains dozens (30+) of Data Storage Domains
- Block Storage (FibreChannel or iSCSI)
- vdsm-4.19, vdsm-4.20
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