Dell PS4100 Technical Information download pdf (Page 43)

June 2012 Dell EqualLogic Configuration Guide v13.2 37

Note: Hosts can be in a different subnet as long as those hosts have layer 3 routing available to the

subnet containing the arrays and the group’s well known IP address.

• Rapid Spanning Tree Protocol must be enabled if the SAN infrastructure has more than two

switches in a non-stacked configuration, and portfast must be enabled on all edge device

ports (hosts, FS Series appliances and arrays).

• Port density requirements to support fully redundant configurations and maximum SAN

throughput are as follows:

o PS4x00 family: 2x 1GbE ports per controller = 4x 1GbE ports total

o PS4110 family: 1x 10GbE port per controller = 2x 10GbE ports total

o PS5x00 family: 3x 1GbE ports per controller = 6x 1GbE ports total

o PS6x00 family: 4x 1GbE ports per controller = 8x 1GbE ports total

o PS6510 family: 2x 10GbE ports per controller = 4x 10GbE ports total

o PS6110 family: 1x 10GbE port per controller = 2x 10GbE ports total

o FS7500 NAS: 12x1GbE ports per controller node (four client LAN and eight iSCSI SAN)

+ 1 100/1000Mb port per controller node for IPMI interconnection

• At least two iSCSI SAN ports per host (block level iSCSI access) are required for fully redundant

SAN connectivity. Host ports can be 1GbE or 10GbE.

• Quality of Service (QoS) based on what is traditionally designated as IEEE 802.1p is not

currently supported for use with EqualLogic SANs. QoS and Class of Service designations must

be disabled.

• All switches within the SAN must be interconnected such that there is always a path from any

Ethernet port on one array to all other Ethernet ports on all other arrays in the group.

• All switches and host network controllers within the infrastructure must have flow control

enabled for optimal performance.

• Any EqualLogic SAN group that is required to send or receive replication traffic to/from

another SAN group must have an uninterrupted communications path (ie. “visibility”) between

each group.

• To prevent a switch failure from also disabling all paths between a host and its connected

volumes, all ports from each controller need to be connected to at least two different

switches. For PS4100/PS6100 family arrays, split the vertical port pair connections between

two switches to ensure 100% bandwidth capability is maintained in the event of a vertical port

failover event. See the configuration diagrams in Section 4.5.1.

• The above guideline regarding path redundancy across multiple switches also applies in FS

Series NAS appliance configurations. (Refer to the connection diagrams in Section 7.1)

• For SANs connecting to an FS Series appliance, all switches in the SAN must have jumbo

frames enabled.

For EqualLogic PS Series Arrays, the following general SAN design

recommendations

apply:

• Take advantage of your switch’s VLAN capabilities. You should create a VLAN dedicated to

iSCSI traffic (even on dedicated switches). If necessary, create a second VLAN for management

traffic. The actual VLAN configuration of your iSCSI SAN will be dictated by your SAN network

design requirements and the features of the iSCSI SAN switches being used.

• Jumbo frames should be enabled. If you choose to use jumbo frames then all nodes in the

SAN fabric must have jumbo frames enabled.

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