3. Service Offering Examples : 3.3 Service Offering – Dedicated : 3.3.1 Service Design Parameters
   
3.3.1 Service Design Parameters
As part of the design process for the Dedicated service offering, providers should give special consideration to key service settings and values in vCloud Director that can impact service performance and consistency levels for a subscriber’s organization virtual datacenter. Although the Reservation Pool allocation model in this service provides stricter controls over the segmentation of resources allocated than the other models, circumstances can still arise that result in subscribers overcommitting resources over time, resulting in negative performance or availability implications, whether for subscribers’ application workload environment or for their service settings, values, and justifications, or both. The following table provides an example of these key service settings, values, and justifications.

Table 17. Resource Allocation Settings Example – Dedicated Service Offering
Allocation
Type
Value Range
Sample Setting
Justification
CPU allocation
Custom
76.8GHz
The amount of CPU resources reserved for this organization virtual datacenter (taken from the supporting provider virtual datacenter and assigned resource cluster).
Memory allocation
Custom
1024GB
The amount of memory resources reserved for this organization virtual datacenter (taken from the supporting provider virtual datacenter and assigned resource cluster).
Maximum number of virtual machines
1–Unlimited
Unlimited
A safeguard that allows control over the total number of vApps or virtual machines created by a subscriber within the target virtual datacenter.
 
In this table, the CPU allocation setting serves as a block or aggregate limit for the entire target organization virtual datacenter and has been configured as 76.8GHz (76,800 MHz). Of this 76.8GHz resource allocation, 100% of total CPU capacity is marked as reserved and guaranteed by default. The memory allocation setting also serves as a block or aggregate limit for the entire target organization virtual datacenter and has been configured as 1024GB. Of this 1024GB resource allocation, 100% of total memory capacity is also marked as reserved and guaranteed by default. This implies zero resource overcommitment by the provider for both compute and memory capacity, and it requires that the underlying provider virtual datacenter and associated physical resource clusters be 100% dedicated to each subscriber, to avoid any resource contention. The provider can use the combination of these settings to adjust CPU and memory capacity as needed, but the need to throttle back overcommitment for this service offering does not apply.