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• 3 GHz Dual-core Xeon/Opteron (or latest)
• 4 GB RAM (2 GB for JVM and 2 GB for the operating system)
• 10 GB free disk space
• ~ Recommended minimum - 2 Cores. For high concurrencies and better performances - 4 Cores.

Disk space is based on the expected storage requirements that are calculated by considering the file uploads and the backup policies. For example, if three WSO2 product instances are running in a single machine, it requires a 4 GHz CPU, 8 GB RAM (2 GB for the operating system and 6 GB (2 GB for each WSO2 product instance)) and 30 GB of free space.

• 2 compute units minimum (each unit having 1.0-1.2 GHz Opteron/Xeon processor)
• 4 GB RAM
• 10 GB free disk space
• One CPU unit for the operating system and one for JVM.

Three WSO2 product instances running would require VM of 4 compute units, 8 GB RAM, and 30 GB free space.
~ 512 MB heap size. This is generally sufficient to process typical SOAP messages but the requirements vary with larger message sizes and  the number of messages processed concurrently.

• 1 c3c5.large instance to run one WSO2 product instance.

Three WSO2 product instances can be run in 1 EC2 Extra-Large instance. Based on the I/O performance of the c3c5.large instance, it is recommended to run multiple instances in a larger instance (c3c5.xlarge or c3.2xlarge).