Pure Stoarge Cloud Dedicated (PSC Dedicated) deploys with the following four Ethernet interfaces on each controller:
- System
- iSCSi
- Management
- Replication
During deployment, users will be asked to provide a private subnet for each interface. There are two network configuration options that can be implemented to accommodate the PSC Dedicated networking requirements.
Simple Network Configuration
The simplest topology is to place all PSC Dedicated interfaces (system, iSCSI, management, replication) onto a dedicated subnet. In this scenario, create a new private subnet with /26 subnet mask (255.255.255.192) which is dedicated to only PSC Dedicated interfaces.
Best Practices
It is a recommended best practice that the Everpure Cloud Dedicated (PSC Dedicated) Ethernet interfaces reside on a subnet that is different from the EC2 host initiators. iSCSI traffic between PSC Dedicated and EC2 host initiators can flow using route tables. In most cases, route tables between subnets are set to "local", which allows traffic to flow between subnets in the same Amazon VPC. There are two reasons for this recommendation:
- Separate subnets minimize the chances that an EC2 host initiator would accidentally use IP addresses belonging to the PSC Dedicated Ethernet interfaces.
- PSC Dedicated instances will need seven new IP addresses for a capacity upgrade. Placing PSC Dedicated Ethernet interfaces on a separate subnet from EC2 host initiators reduces the chance that the subnet runs out of IP addresses.
Recommended Network Configuration
This network topology places each PSC Dedicated interface in a separate private subnet. It offers an optimal solution because it allows traffic isolation. It also minimizes the chance of having a network overlap. The following network configuration diagram is an example of this topology.
Mandatory Requirements
- All subnets for PSC Dedicated must be private subnets for greater security.
- If multiple private subnets are used for PSC Dedicated, they must be all in the same Availability zone.
- Ensure the private subnet for the System interface has internet access; see the Internet Access.
The following table summarizes the requirements for each interface type:
|
Interface Name |
Interface |
Subnet Type |
Internet Access Required? |
|
System |
eth0 |
Private |
Y (port 443) |
|
Replication |
eth1 |
Private |
N |
|
iSCSI |
eth2 |
Private |
N |
|
Management |
eth3 |
Private |
N |
IP Addresses
Deploying a new PSC Dedicated instance requires 21 private IP addresses. For a capacity upgrade, an additional seven private IP addresses are required from the subnet where System interfaces reside. This results in a maximum of 28 IP addresses per V10 or V20 instance. It is recommended that the subnet used for the System interfaces has a network mask of
255.255.255.192 (/26). This ensures that there is enough space for capacity expansion.