5.2.3 Hardware Considerations

However, it is important to note that providing ArcGIS Enterprise HA is dependent on the service level agreement (SLA) the City has with its users or customers and is more than providing enough hardware for ArcGIS Enterprise to fulfill the SLA.

To determine an acceptable HA the City will have to decide what is an acceptable downtime for one component of ArcGIS Enterprise. This is determined by the criticality of business continuity between the Recovery Time Objective and the Recovery Point Objective. The less interruption required typically means the more expensive it is to recover from any unscheduled downtime.

As an example, to claim a 95.0% availability SLA with ArcGIS Enterprise, would mean only 8.4 planned hours of downtime per week allowed. This table represents the acceptable downtime for a given business workflow.

Availability (%)

95.0 99.0 99.9 99.99 99.999

Downtime per year

18.25 days 3.65 days 8.76 hours 52.56 minutes 5.26 minutes

Downtime per week

8.4 hours 1.68 hours 10.1 minutes 1.01 minutes 6.05 seconds

5.2.3 Hardware Considerations There are several options when considering hardware to support the GIS Enterprise. GISinc has narrowed it down to the following configuration that we feel would best support the GIS activities at the City. GISinc understands that the City of Miramar currently has one primary location that is considered a data center with its own hardware and software to support specific requirements.

Information Technology has expressed a strong desire to move as much infrastructure into the Cloud as possible. Further, the Police Department has indicated a requirement for Criminal Justice Information Service (CJIS) compliance. While both Microsoft Azure and Amazon AWS clouds offer a CJIS-compliant government cloud platform, Police expressed a strong desire for Microsoft Azure for ease of procurement. As such, GISinc has designed the system below using Microsoft Azure server specifications.

Hardware Configuration Option

The City’s main server room at the City Hall presently hosts the ArcGIS Enterprise in the virtual environment for all GIS activities throughout the City. This environment will be moved to the Cloud with the following servers. GISinc recommends the following architecture specifications for an initial production environment.

• Web Servers: Azure D2V3 2-core, 8GB RAM or Azure B4MS 4-core 16GB RAM • GIS Servers: Azure B4MS 4-core, 16GB RAM • Portal Servers: Azure B4MS 4-core, 16GB RAM • Data Servers: Azure B4MS 4-core, 16GB RAM • Desktops: Azure D2V3 2-core, 8GB RAM

This configuration will provide necessary performance while also allowing the City to expand as needed to support additional server roles such as Image Server for publishing and sharing