Dell Brocade 1020 Brocade Adapters Installation and Reference Manual - Page 56
Server Application Optimization SAO license., FCP-IM I/O Profiling
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1 Adapter features • LUN masking. LUN masking establishes access control to shared storage to isolate traffic between different initiators that are zoned in with the same storage target. LUN masking is similar to zoning, where a device in a specific zone can communicate only with other devices connected to the fabric within the same zone. With LUN masking, an initiator port is allowed to only access those LUNs identified for a specific target. Enable LUN masking on an adapter physical port through the HCM Basic Port Configuration dialog box and the BCU fcpim -lunmaskadd command to identify the logical port (initiator) and remote WWN (target) for the LUN number. Refer to the Brocade Adapter Administrator's Guide for more information on configuration. This feature has following limitations. - Only 16 LUN masking entries are allowed per physical port - Multiple BCU instances for adding and deleting LUN masking are not supported - This feature is only supported on Brocade HBAs and on Fabric Adapter ports configured in HBA mode. You can configure LUN masking for a particular target even without the actual devices being present in the network. When configuring boot over SAN, mask the boot LUN so that the initiator has exclusive access to the boot LUN. Refer to the Brocade Administrator's Guide for more information. • Quality of Service (QoS) feature working in conjunction with the QoS feature on Brocade switches to assign high, medium (default), or low traffic priority to a given source or destination traffic flow. The following licenses need to be installed on the edge switch connected to each HBA port or Fabric Adapter ports configured in HBA mode: - Adaptive Networking (AN) license. - Server Application Optimization (SAO) license. To determine if these licenses are installed on the connected switch, execute the Fabric OS licenseshow command. For more information about Fabric OS commands and QoS support, refer to the Fabric OS Administrator's Guide. • FCP-IM I/O Profiling This feature, available through HCM, can be enabled or disabled on a physical port. When enabled, the driver firmware categories I/O latency data into average, minimum, and maximum categories. Use this feature to analyze traffic patterns and help tune HBAs, Fabric Adapter port configured in HBA mode, fabrics, and targets for better performance. Note that enabling this feature impacts I/O performance. • Interrupt Coalescing This feature provides a method to delay generation of host interrupts and thereby combine (coalesce) processing of multiple events. This reduces the interrupt processing rate and reduces the time that the CPU spends on context switching. You can configure the following parameters per port to adjust interrupt coalescing: 28 Brocade Adapters Installation and Reference Manual 53-1002144-01