vSAN CPU Usage/overhead
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vSAN CPU Usage/overhead


Article ID: 326556


Updated On:


VMware vSAN


As per "Designing and Sizing vSAN Hosts"10% CPU overhead needs to be considered for vSAN when considering hosts hardware requirements for your vSAN cluster.
This 10% vSAN overhead depends on the I/O workload and cannot be determined beforehand.


When planning your vSAN Cluster, take the following considerations into account when planning CPU size as these options will impact the CPU overhead/usage:

1) Storage Efficiency method you would like to use ie. Deduplication, Compression, both, or none
2) Storage Policy you want to use ie. RAID1/5/6, stripe width, failures to tolerate, Site disaster Tolerance (stretch clusters only)
3) vSAN Encryption ie. Data at rest encryption, Data in transit encryption, or no encryption
4) RDMA-capable NICs (This allows faster access to data in RAM and doesn't require CPU cycles)

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