Storage Allocation and VM Overheads

Owned by Tahir Kulelija
Last updated: 10 Nov 2020
1 min read

The storage numbers are always calculated the same way for Virtual Datacenters:

Storage Used = Total allocated disk space of VMs deployed in Org VDC + Total memory of VMs deployed* in Org VDC (to account for VM swap usage) + Maximum possible existing snapshot size

Storage allocated = Org VDC storage allocation

Example 1: If you have 1 VM with 1 GB RAM and 10 GB disk the storage usage will be: 10 GB (disk) + 1  GB (VM swap) = 11 GB.

Example 2: If you have 1 VM with 1 GB RAM and 10 GB disk and create a snapshot (including memory), the storage usage will be: 10 GB (disk) + 1  GB (VM swap) + 10 GB (maximum disk snapshot size) + 1 GB (memory snapshot size) = 22 GB.

* Virtualisation Platforms stores VM Memory as files on storage to increase resiliency  in HA scenarios and during periods of high usage.