-The first level provisioning sets the per-disk IOPS and bandwidth assignment. At the second level, compute server host implements SSD provisioning, applying it only to data that is stored on the server’s SSD, which includes disks with caching (ReadWrite and ReadOnly) as well as local and temp disks. Finally, VM network provisioning takes place at the third level for any I/O that the compute host issues to Storage backend. With this scheme, the performance of a VM depends on a variety of factors, from how the VM uses the local SSD, to the number of disks attached, as well as the performance and caching type of the disks it has attached.
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