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Overview

Cisco Unified Computing System

(Cisco UCS

) 2 .1 .2a introduces the fNIC Tunables feature, which provides the capability

™

to tune the fNIC Queue Depth and I/O Throttle Count parameters of the Cisco UCS Virtual Interface Card (VIC) Fibre Channel

network interface card (fNIC) driver in Linux and VMware ESX implementations . This guide provides an overview of these

two parameters and the methodologies and syntax for modifying their values . Prior to Cisco UCS 2 .1 .2a, both of these

parameters were statically set to industry best practice defaults, and these values are still recommended for the vast majority

of architectures . The ability to tune these parameters provides flexibility for those customers whose architectures may require

nondefault values . Modifying default values to specific solutions is beyond the scope of this guide .

Audience

This document is intended for Cisco systems engineers and customers involved in systems administration and performance

engineering on Cisco UCS Linux and VMware ESX implementations . It assumes advanced knowledge and understanding of Linux

and VMware operating system configurations in the context of storage technologies .

Test Environment

Cisco UCS

Cisco UCS Manager (UCSM) 2 .1 .2a

(2) Cisco UCS 6248UP 48-Port Fabric Interconnects

(2) Cisco UCS 2208XP I/O Modules

(1) Cisco UCS 5108 Blade Server Chassis

(1) Cisco UCS B200 M3 Blade Server with UCS VIC 1240 modular LAN on motherboard (mLOM)

(1) Cisco UCS B200 M2 Blade Server with UCS VIC M81KR

fNIC Driver

1 .5 .0 .45 (minimum version)

fNIC Tunable Parameters

The two new fNIC tunable parameters introduced in UCSM 2 .1 .2a are Queue Depth and I/O Throttle Count . Definitions for each

of these parameters are as follows:

• Queue Depth: The total number of I/O requests that can be outstanding on a per-logical unit number (LUN) basis .

• I/O Throttle Count: The total number of I/O requests that can be outstanding on a per-virtual host bus adapter (vHBA) basis .

Operating System Support

The Queue Depth and I/O Throttle Count tunable parameters are supported on the following operating systems:

• Red Hat Linux 6 .x (RHEL 6 .x)

• Red Hat Linux 5 .x (RHEL 5 .x)

• SUSE Linux Enterprise 11 (SLES 11)

• XenServer (XS)

• VMWare ESX 5 .x (ESX)

• Not Supported: VMware ESX 4 .x