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Table Of Contents
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If the request specifies an allocation model, the allocation model in the reservation must match the
allocation model in the request.
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If the blueprint specifies a reservation policy, the reservation must belong to that reservation policy.
Reservation policies are a way to guarantee that the selected reservation satisfies any additional
requirements for provisioning machines from a specific blueprint. For example, if a blueprint uses a
specific machine image, you can use reservation policies to limit provisioning to reservations
associated with the regions that have the required image.
If no reservation is available that meets all of the selection criteria, provisioning fails.
If multiple reservations meet all of the criteria, the reservation from which to provision a requested
machine is determined by the following logic:
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Reservations with higher priority are selected over reservations with lower priority.
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If multiple reservations have the same priority, the reservation with the lowest percentage of its
machine quota allocated is selected.
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If multiple reservations have the same priority and quota usage, machines are distributed among
reservations in round-robin fashion.
If multiple storage paths are available on a reservation with sufficient capacity to provision the machine
volumes, storage paths are selected according to the following logic.
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If the blueprint or request specifies a storage reservation policy, the storage path must belong to that
storage reservation policy.
If the custom property VirtualMachine.DiskN.StorageReservationPolicyMode is set to Not
Exact, and no storage path with sufficient capacity is available in the storage reservation policy, then
provisioning proceeds with a storage path outside the specified storage reservation policy. The
default value of VirtualMachine.DiskN.StorageReservationPolicyMode is Exact.
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Storage paths with higher priority are selected over reservations with lower priority.
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If multiple storage paths have the same priority, machines are distributed among storage paths by
using round-robin scheduling.
Using Amazon Security Groups
Specify at least one security group when creating an Amazon reservation. Each available region requires
at least one specified security group.
A security group acts as a firewall to control access to a machine. Every region includes at least the
default security group. Administrators can use the Amazon Web Services Management Console to create
additional security groups, configure ports for Microsoft Remote Desktop Protocol or SSH, and set up a
virtual private network for an Amazon VPN.
Configuring vRealize Automation
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