Dell PS6500, Руководство по оборудованию

Страница: 42 / 68

PS6500 Hardware Maintenance Maintaining Control Modules
3-10
Network Requirements and Recommendations
The minimum network configuration for a PS Series array consists of a connection between Ethernet 0 on each
control module and a computer or a network switch. To increase performance and availability, configure multiple
network interfaces on an array and connect them to multiple switches.
Dell recommends that you follow the guidelines in Table 3-4. In addition, all the usual rules for proper network
configuration apply to group members. General network configuration is beyond the scope of this manual.
Table 3-4: Network Recommendations
Recommendation Description
Switched Gigabit Ethernet
network Connect arrays and hosts to a switched network and make sure that all network
connections between hosts and arrays are Gigabit Ethernet. Although an array can operate
at 10 or 100 Mbits, performance will be slower than when using a Gigabit Ethernet
switch.
Multiple network connections For increased bandwidth and availability, connect all the network interfaces 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.
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 Using a multipathing solution helps 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 storage 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 should only be enabled on switch ports that connect end
nodes.
You can use Spanning-Tree for a single-cable connection between switches, or 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 NIC that handles iSCSI traffic.
VLANs Configure switches to use VLANs to separate iSCSI SAN traffic from other network
traffic.