The storage policies are applied to virtual machines and their objects. There is a default policy set on the VSAN datastore. This policy is applied to all new virtual machines that do not have a specific policy assigned to them.

Default vSAN Storage Policies for Workload Virtual Machines

VMWARE CLOUD ON AWS

VSAN STORAGE POLICY FEATURE

SETTING

Primary level of failures to tolerate

1

Number of disk stripes per object

1

Flash read cache reservation, or flash capacity used for read cache

0

Object Space Reservation

0

Force provisioning

0

Figure 6 shows how the total raw capacity of a single host cluster is consumed to provide the final usable capacity when all virtual disks are configured with the storage policy of RAID 5/6.

The customer cloud administrator is unable to reconfigure the storage policies set to the management virtual machines. Instead of using RAID-1, the vSAN storage policy of management VMs is configured with the RAID 5/6 Fault Tolerance Method. This reduces the capacity footprint of the management virtual machines, preserving the most available datastore capacity for workload virtual machines. The primary level of failures to tolerate for management virtual machines is adjusted if the ESXi host count inside the Cloud SDDC is six or more.

Default vSAN Storage Policies for Management VMs

VMWARE CLOUD ON AWS VSAN STORAGE POLICY FEATURE

3-5 NODE CLUSTER

6+ NODE CLUSTER

Primary level of failures to tolerate

1 2

Fault Tolerance Method

RAID 5 (Erasure Coding) - Capacity RAID 6 (Erasure Coding) - Capacity

Object Space Reservation

100% 100%

The customer cloud administrator is able to create a storage policy with the required failure tolerance method for the vSAN datastore storing the workload virtual machines. With four hosts, the default is set to RAID-5 for the initial cluster configuration. If
the SDDC cluster contains six ESXi hosts, the RAID-6 erasure coding fault tolerance method is supported. The new storage policy can act as the default storage policy of the WorkloadDatastore.

For more details on datastore storage policies within VMware Cloud on AWS, see the vSAN Policies documentation.

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