Hardware Sizing

Introduction

A sizing is an approximation of the hardware resources required to support a specific software implementation, in this case SmartHCM. This document sets main foundations towards sizing the hardware required to run SmartHCM. SmartHCM has experience managing internal product installations on the basic instance types provided by Amazon EC2: m1.small, c1.medium and m1.large. We know the results that these instances can provide us, both in terms of performance and scalability. At the same time SmartHCM embraces experience of our customers running product on physical hardware and also using virtualization. In addition to this SmartHCM does performance tests for particular product usage scenarios. These three inputs has allowed us to write a table comparing the hardware resources needed to support particular number of concurrent users.

Sizing Table

ID	Topology	EC2 instance type	EC2 instance type (app server)	EC2 instance type (DB server)	Optimal concurrent users	Architecture	Bandwidth	Hardware equivalence (single server)	Hardware equivalence (app server)	Hardware equivalence (DB server)
1.	Single	c3.xlarge	-	-	25	64-bit (x86_64)	10 Mbps	Quad Core 2.8 GHz Intel Xeon, 8GB RAM, disk 10000 rpm	-	-
2.	Single	c3.2xlarge	-	-	50	64-bit (x86_64)	10 Mbps	8 - Core 2.8 GHz Intel Xeon, 16GB RAM, disk 10000rpm	-	-
3.	Dual	-	c3.2xlarge	c3.2xlarge	100	64-bit (x86_64)	20 Mbps	-	15 GiB of memory, 8 vCPUs, 320 GB of SSD-based local instance storage	15 GiB of memory, 8 vCPUs, 320 GB of SSD-based local instance storage
4.	Dual	-	c3.4xlarge	c3.4xlarge	200	64-bit (x86_64)	30 Mbps	-	30 GiB of memory, 16 vCPUs, 320 GB of SSD-based local instance storage	30 GiB of memory, 16 vCPUs, 320 GB of SSD-based local instance storage