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PS4100 Installation Guide Connecting the Array Cables

Table 3 Network Recommendations

Minimum and Recommended Cable Configurations

For a single control module array, the minimum configuration is one network connection to Ethernet 0.

However, the single network connection is a potential point of failure. Dell recommends that you connect

all the available Ethernet ports to different network switches connected with interswitch links.

For a dual control module array, at a minimum, connect network cables to Ethernet 0 on both control

modules and then connect the cables to a network switch.

For maximum network bandwidth and availability, Dell recommends that you use four network cables to

Recommendation Description

Multiple network connections

to different network switches

For increased bandwidth and availability, connect the Ethernet ports on

both control modules to multiple network switches.

The switches must be connected using interswitch links. The links must

have sufficient bandwidth to handle the iSCSI traffic.

After connecting the network interfaces, use the Group Manager GUI or

CLI to assign an IP address and netmask to each interface.

Management network

(optional)

Optionally, connect the management ports on both control modules to a

10/100Mbps network switch to keep management traffic separate from

iSCSI traffic.

Access to the group IP address In a multi-subnet group, each configured network interface should have

access to the subnet on which the group IP address resides.

Redundant network paths

between computers and arrays

Use a multipathing solution to make sure that no single point of failure

exists between computers and arrays.

For replication, a reliable,

adequately sized network link

For effective and predictable replication, make sure that the network link

between the primary and secondary groups is reliable and provides

sufficient bandwidth for copying data.

No STP functionality on

switch ports that connect end

nodes

If possible, do not use Spanning-Tree Protocol (STP) on switch ports

that connect end nodes (iSCSI initiators or array network interfaces).

However, if you must use STP or RSTP (preferable to STP), you should

enable the port settings (available on some switches) that let the port

immediately transition into STP forwarding state upon link up. This

functionality can reduce network interruptions that occur when devices

restart, and it should only be enabled on switch ports that connect end

nodes.

You can use Spanning-Tree for a single-cable connection between

switches, and you can use trunking for multi-cable connections between

switches.

Flow Control enabled on

switches and NICs

Enable Flow Control on each switch port and NIC that handles iSCSI

traffic. PS Series arrays will correctly respond to Flow Control.

Unicast storm control disabled

on switches

Disable unicast storm control on each switch that handles iSCSI traffic

if the switch provides this feature. However, the use of broadcast and

multicast storm control is encouraged on switches.

Jumbo Frames enabled Enable Jumbo Frames on each switch and each NIC that handles iSCSI

traffic.

VLANs Configure switches to use VLANs to separate iSCSI SAN traffic from

other network traffic.

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