When planning your AWS instance, it is important to keep high availability in mind prior to creating your instance. The decision to create a highly available storage solution using Buurst's SoftNAS must be made early in order to allow you to prepare your build accordingly. One decision that needs to be made early is whether to use Instance, Elastic or Virtual IPs. Beyond choosing the type of IP address you wish, there are many configuration steps required to prepare for a high availability configuration. For complete coverage of high availability through SoftNAS, go to our High Availability Documentation

Amazon EC2 provides three two types of IP addresses:

1. Instance IP address: each instance is assigned a dynamic IP address, assigned by DHCP. These are on the internal, private network, assigned by DHCP. They will be different each time a SoftNAS instance is booted.
    
2. Virtual IP addresses: Buurst's SoftNAS now supports the set up of highly available VPCs with private subnets using virtual IPs. If setting up SoftNAS SNAP HA^TM with virtual IPs, there is no need to create Elastic IPs at all. The IPs assigned statically or via DHCP at instance creation time can be retained.

Virtual IPs and High Availability

Setup and maintenance of Virtual IP addresses are covered in our High Availability Documentation. Virtual IP addresses are relatively simple to set up, requiring only that each VPC instance must have an IP in the same CIDR block. A third IP outside this CIDR block will be selected during the HA wizard setup. This will be the IP address you will use to access the highly available share, whichever instance is currently the primary.

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