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50-35
Cisco MDS 9000 Family Fabric Manager Configuration Guide
OL-17256-03, Cisco MDS NX-OS Release 4.x
Chapter 50 Configuring iSCSI
Configuring iSLB
Caution Changing the forwarding mode of an iSCSI interface that is part of an iSLB VRRP group impacts load
balancing on the interface. See the
“Changing iSCSI Interface Parameters and the Impact on Load
Balancing” section on page 50-45.
Configuring iSLB
The iSCSI server load balancing (iSLB) feature provides a means to easily configure large scale iSCSI
deployments containing hundreds or even thousands of initiators. When not using iSLB, configuring
iSCSI requires the following:
• You need to perform multiple configuration steps on the MDS switch, including the following:
–
Initiator configuration using static pWWN and VSAN.
–
Zoning configuration for initiators and targets.
–
Optional create virtual target and give access to the initiator.
–
Configuration of target LUN mapping and masking on the storage system for the initiator based
on the static pWWN created for the initiator on the MDS switch.
• You need to duplicate the configuration manually on multiple MDS switches.
• There is no load balancing for IPS ports. For example:
–
The Virtual Router Redundancy Protocol (VRRP) only supports active and backup, not load
balancing.
–
You must use multiple VRRP groups and configure hosts in different groups.
iSLB provides the following features:
• The iSLB initiator configuration is simplified with support for initiator targets and auto-zones.
• Cisco Fabric Services (CFS) eliminates the need for manual configuration by distributing the iSLB
initiator configuration among all MDS switches in the fabric.
Note Only statically mapped iSLB initiator configuration is distributed throughout the fabric
using CFS. Dynamically and statically mapped iSCSI initiator configurations are not
distributed.
• Dynamic load balancing of iSLB initiators is available using iSCSI login redirect and VRRP.
This section covers the following topics:
• About iSLB Configuration Limits, page 50-36
• iSLB Configuration Prerequisites, page 50-36
• About iSLB Initiators, page 50-37
• Configuring iSLB Using Device Manager, page 50-37
• Configuring iSLB Initiators, page 50-39
• About Load Balancing Using VRRP, page 50-43
• Configuring Load Balancing Using VRRP, page 50-45
• About iSLB Configuration Distribution Using CFS, page 50-46
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