How Does Iscsi Optimization Interact With Dell Equallogic Arrays; What Occurs When Iscsi Optimization Is Enabled Or Disabled - Dell PowerConnect 8024 User Configuration Manual

How Does iSCSI Optimization Interact With Dell EqualLogic Arrays?

The iSCSI feature includes auto-provisioning support with the ability to
detect directly connected Dell EqualLogic SAN storage arrays and
automatically reconfigure the switch to enhance storage traffic flows.
The PowerConnect 8000-series and 8100-series switches uses LLDP, a vendor-
neutral protocol, to discover Dell EqualLogic devices on the network. LLDP
is enabled by default. For more information about LLDP, see "Discovering
Network Devices" on page 637.
When the switch detects a Dell EqualLogic array, the following actions occur:
• An MTU of 9216 is enabled on all ports and port-channels, if it is not
already enabled.
• Spanning-Tree portfast is enabled on the interface identified by LLDP.
• Unicast storm control is disabled on the interface identified by LLDP.
If the iSCSI CoS policy feature is enabled on the switch and an EqualLogic
array is detected, the switch applies additional iSCSI CoS policies to the
EqualLogic inter-array traffic on TCP ports 9876 and 25555. If the iSCSI CoS
policy is disabled and EqualLogic arrays are present, the additional CoS
policy is removed globally.

What Occurs When iSCSI Optimization Is Enabled or Disabled?

When iSCSI is enabled on the switch, the following actions occur:
• Flow control is globally enabled, if it is not already enabled.
• iSCSI session snooping is enabled
• iSCSI LLDP monitoring starts to automatically detect Dell EqualLogic
arrays.
If the iSCSI feature is disabled on the switch, iSCSI resources are released
and the detection of Dell EqualLogic arrays by using LLDP is disabled.
Disabling iSCSI does not remove the MTU, flow control, portfast or storm
control configuration applied as a result of enabling iSCSI. iSCSI
Optimization is enabled by default.
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Configuring iSCSI Optimization