OS10 Enterprise Edition User Guide Release 10.4.0E(R3)

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Internet small computer system interface

iSCSI is a TCP/IP-based protocol for establishing and managing connections between servers and storage devices in a data center network. After you enable iSCSI, iSCSI optimization automatically detects Dell EqualLogic storage arrays directly attached to switch ports. To support storage arrays where auto-detection is not supported, manually configure iSCSI optimization using the iscsi profile-storage name command.

iSCSI optimization enables a switch to auto-detect Dell’s iSCSI storage arrays and auto-configure switch ports to improve storage traffic throughput. The switch monitors iSCSI sessions and applies QoS policies on iSCSI traffic. iSCSI optimization operates with or without DCBX over an Ethernet network.

  • iSCSI uses the current flow-control configuration by default. If you do not configure flow-control, iSCSI auto-configures flow control settings so that receive-only is enabled and transmit-only is disabled.
  • The switch monitors and tracks active iSCSI sessions, including port information and iSCSI session information.
  • A user-configured iSCSI class of service (CoS) profile is applied to all iSCSI traffic. Classifier rules are used to direct the iSCSI data traffic to queues with preferential QoS treatment over other data passing through the switch. Preferential treatment helps to avoid session interruptions during times of congestion that would otherwise cause dropped iSCSI packets.

Internet small computer system interface

In an iSCSI session, a switch connects CNA servers (iSCSI initiators) to a storage array (iSCSI targets) in a storage area network (SAN) or TCP/IP network. iSCSI optimization running on the switch uses dot1p priority-queue assignments to ensure that iSCSI traffic receives priority treatment.


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