Subnet Traffic Assignments
Traffic assignments determine what type of iSCSI traffic a data subnet carries. You can assign a data subnet on an iSCSI array
to carry one of the following kinds of traffic.
Note: Traffic assignments are not required for Fibre Channel arrays.
Table 3: Traffic Assignments
DescriptionTraffic Assignment
The subnet carries both iSCSI data traffic and intra-group communication (traffic between arrays
in a group).
iSCSI + Group
The subnet carries only iSCSI data traffic.iSCSI only
The subnet carries intra-group communication traffic.Group only
IP Address Zones in Subnets
An IP address zone is a group of host IP addresses and array data IP addresses in a subnet. When using two switches for iSCSI
traffic, hosts can achieve better performance by establishing iSCSI connections with data IP addresses inside the same zone,
as opposed to establishing iSCSI connections with data IP addresses in a different zone.
Note: IP address zones are not required for Fibre Channel arrays.
The IP addresses within a subnet can be divided into IP address zone types.
Table 4: IP Address Zone Types
DescriptionZone Type
Used for non-iSCSI enabled subnets.None
All IP addresses are in one zone. This is the default zoning setting.
With two network switches, iSCSI connections can be routed over the inter-switch link.
Single
One zone includes the IP addresses from the top half of the subnet; for example, 192.168.1.128 to
192.168.1.254. The other zone takes the IP addresses from the bottom half of the subnet; for example,
192.168.1.1 to 192.168.1.127
Bisect
The IP addresses are grouped by their last bit. One zone includes the even-numbered IP addresses, such
as 192.168.1.2, 192.168.1.4, 192.168.1.6, and so on. The other zone includes the odd-numbered IP ad-
dresses, such as 192.168.1.1, 192.168.1.3, 192.168.1.5, and so on.
Even/Odd
IP address zones are useful for configurations that use two switches, where you want to establish connections that avoid the
Inter-Switch Link. For IP address zones to work, the host and the array must have their data IP addresses configured with half
of their IP addresses from one zone connected to one switch and the other half of its IP addresses from the other zone
connected to the other switch. For example, assume that:
• There is a single subnet, 192.168.1.0/24.
• There are two zones, defined as Red and Blue.
• Red zone consists of:
• Host IP 192.168.1.1
• Array Data IP 192.168.1.3
• Array Data IP 192.168.1.5
• Blue zone consists of:
Install the HPE Storage Array 14
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