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Dell PowerEdge FN I/O Module Configuration Guide 9.10(0.0)

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iSCSI Optimization Overview

iSCSI is a TCP/IP-based protocol for establishing and managing connections between IP-based storage devices and initiators in a storage area network (SAN).

iSCSI optimization enables the network switch to auto-detect Dell’s iSCSI storage arrays and triggers self-configuration of several key network configurations that enables optimization of the network for better storage traffic throughput.

iSCSI optimization provides a means of monitoring iSCSI sessions and applying QoS policies on iSCSI traffic. When enabled, iSCSI optimization allows a switch to monitor (snoop) the establishment and termination of iSCSI connections. The switch uses the snooped information to detect iSCSI sessions and connections established through the switch.

iSCSI optimization allows you to reduce deployment time and management complexity in data centers. In a data center network, Dell EqualLogic and Compellent iSCSI storage arrays are connected to a converged Ethernet network using the data center bridging exchange protocol (DCBx) through Ethernet switches.

iSCSI session monitoring over virtual link trunking (VLT) synchronizes the iSCSI session information between the VLT peers, allowing session information to be available in both VLT peers.

iSCSI optimization functions as follows:

  • Manual configuration to detect Compellent storage arrays where auto-detection is not supported.
  • Jumbo frames — Ports are set to a maximum transmission unit (MTU) of 12,000 bytes.
  • If you configured flow-control, iSCSI uses the current configuration. If you did not configure flow-control, iSCSI auto-configures flow control.
  • iSCSI monitoring sessions — the switch monitors and tracks active iSCSI sessions in connections on the switch, including port information and iSCSI session information.
  • iSCSI QoS — 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 that can be given 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.
  • iSCSI DCBx TLVs are supported.

The following figure shows iSCSI optimization between servers in a server enclosure and a storage array in which an Aggregator connects installed servers (iSCSI initiators) to a storage array (iSCSI targets) in a SAN network. iSCSI optimization running on the Aggregator is configured to use dot1p priority-queue assignments to ensure that iSCSI traffic in these sessions receives priority treatment when forwarded on Aggregator hardware.

Figure 1. iSCSI Optimization Example iSCSI Optimization

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