Dell Dell SC Series User manual

A Dell Deployment and Configuration Guide
Brocade VDX 6740
Switch Configuration Guide for Dell SC Series SANs
Dell Storage Engineering
November 2015

2 SCG2013 | Brocade VDX 6740 Switch Configuration Guide for Dell SC Series SANs
Revisions
THIS WHITE PAPER IS FOR INFORMATIONAL PURPOSES ONLY, AND MAY CONTAIN TYPOGRAPHICAL ERRORS AND TECHNICAL INACCURACIES.
THE CONTENT IS PROVIDED AS IS, WITHOUT EXPRESS OR IMPLIED WARRANTIES OF ANY KIND.
© 2015 Dell Inc. All rights reserved. Dell, the DELL logo, and the DELL badge are trademarks of Dell Inc. Other trademarks and trade names may be
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marks and names of others.
Date
Description
November 2015
Initial release

3 SCG2013 | Brocade VDX 6740 Switch Configuration Guide for Dell SC Series SANs
Table of contents
Revisions............................................................................................................................................................................................. 2
1Introduction................................................................................................................................................................................4
1.1 Document conventions .................................................................................................................................................4
1.2 Audience...........................................................................................................................................................................4
1.3 Switch details ...................................................................................................................................................................4
1.4 Cabling diagram .............................................................................................................................................................. 5
2Dell recommended switch configuration .............................................................................................................................6
2.1 Hardware configuration.................................................................................................................................................6
2.2 Delete startup configuration.........................................................................................................................................6
2.3 Configure Global LLDP settings to disable DCB ....................................................................................................... 7
2.4 Disable Ethernet Fabric on edge ports........................................................................................................................ 7
2.5 Enable Jumbo MTU ........................................................................................................................................................ 7
2.6 Enable Switchport........................................................................................................................................................... 7
2.7 Enable link level flow control (802.3x) ........................................................................................................................ 7
2.8 Configure Spanning tree on edge ports .....................................................................................................................8
2.9 Disable LLDP iSCSI priority on Switch Ports...............................................................................................................8
2.10 Save configuration ..........................................................................................................................................................8
2.11 Configure additional switch ..........................................................................................................................................8
3Performance tuning ..................................................................................................................................................................9
4Configuring VCS ID and Rbridge-ID (optional) ..................................................................................................................10
AAdditional resources.................................................................................................................................................................11

4 SCG2013 | Brocade VDX 6740 Switch Configuration Guide for Dell SC Series SANs
1Introduction
This document illustrates how to configure the Brocade®VDX®6740 switch for use with Dell™ SC Series
storage using Dell best practices.
1.1 Document conventions
Table 1 lists the formatting conventions used in this document.
Table 1 Document conventions
Format
Description
Example
Bold
User input
Dell>enable
Italic
Placeholder or variable
your password
<Italic> <brackets>
Separate variables
<ip address> <mask>
1.2 Audience
This switch configuration guide describes a verified configuration following Dell best practices for an SC
Series iSCSI SAN and is intended for storage or network administrators and deployment personnel.
1.3 Switch details
Table 2 provides an overview of the switch configuration.
Table 2 Switch specifications
Brocade VDX 6740
Switch vendor
Brocade
Switch model
VDX 6740
Switch firmware
NOS 5.0.1
Note: For proper functionality, the switch must be at the firmware version shown in Table 2 before
proceeding with this configuration. Using previous firmware versions may have unpredictable results.
The latest firmware updates and documentation can be found at: http://www.brocade.com.

5 SCG2013 | Brocade VDX 6740 Switch Configuration Guide for Dell SC Series SANs
1.4 Cabling diagram
The cabling diagram shown below represents the Dell recommend method for deploying your servers and
SC Series arrays.
Figure 1 Cabling diagram

6 SCG2013 | Brocade VDX 6740 Switch Configuration Guide for Dell SC Series SANs
2Dell recommended switch configuration
Follow these steps to configure two Brocade VDX 6740 switches. An optional Port Upgrade license is
required to use the 40G uplinks.
Note: The configuration steps in this section are only recommended when the switch is used as a
dedicated SAN for iSCSI traffic (not shared with any other traffic type).
2.1 Hardware configuration
1. Power on both switches.
2. Connect a serial cable to the management port.
3. Using any terminal utility, open a serial connection session to the switch.
4. Open your terminal emulator and configure it to use the serial port (usually COM1 but this may
vary depending on your system). Configure serial communications for 9600,N,8,1 and no flow
control.
5. Connect the cables between switch 1 and switch 2 as shown in Figure 1. This will be used as your
Brocade LAG link.
Note: The below configuration steps assumes that the switch is configured with a unique Rbridge-id and
VCS id. Refer to section 4 on how to change the Rbridge-id and VCS id of the switch.
2.2 Delete startup configuration
Note: This example assumes a switch at its default configuration settings. The copy default-config
startup-config command sets the startup configuration file to its default settings. Always back up
your configuration settings prior to performing any configuration changes.
sw0# copy default-config startup-config
This operation will modify your startup configuration. Do you want to continue?
[y/n]:y
WARN: "reload system" is required to have configuration changes take effect!
sw0# reload system
Warning: This operation will cause the chassis to reboot and
requires all existing telnet, secure telnet and SSH sessions to be
restarted.
Are you sure you want to reboot the chassis [y/n]? y
Note: The switch will reboot.

7 SCG2013 | Brocade VDX 6740 Switch Configuration Guide for Dell SC Series SANs
2.3 Configure Global LLDP settings to disable DCB
The following commands are issued to disable dcbx-tlv and iscsi-app tlv.
sw0#configure
sw0(config)#protocol lldp
sw0(conf-lldp)#no advertise dcbx-iscsi-app-tlv
sw0(conf-lldp)#no advertise dcbx-tlv
sw0(conf-lldp)#exit
2.4 Disable Ethernet Fabric on edge ports
sw0(config)#interface TenGigabitEthernet 1/0/1-48
sw0(conf-if-te-1/0/1-48)# no fabric isl enable
sw0(conf-if-te-1/0/1-48)# no fabric trunk enable
sw0(conf-if-te-1/0/1-48)# exit
2.5 Enable Jumbo MTU
sw0(config)#interface TenGigabitEthernet 1/0/1-48
sw0(conf-if-te-1/0/1-48)# mtu 9216
sw0(conf-if-te-1/0/1-48)# exit
2.6 Enable Switchport
sw0(config)#interface TenGigabitEthernet 1/0/1-48
sw0(conf-if-te-1/0/1-48)# switchport
sw0(conf-if-te-1/0/1-48)# switchport mode access
sw0(conf-if-te-1/0/1-48)# exit
2.7 Enable link level flow control (802.3x)
sw0(config)#interface TenGigabitEthernet 1/0/1-48
sw0(conf-if-te-1/0/1-48)# qos flowcontrol tx off rx on
sw0(conf-if-te-1/0/1-48)# exit

8 SCG2013 | Brocade VDX 6740 Switch Configuration Guide for Dell SC Series SANs
2.8 Configure Spanning tree on edge ports
sw0(config)#protocol spanning-tree rstp
sw0(config-rstp)#exit
sw0(config)#interface TenGigabitEthernet 1/0/1-48
sw0(conf-if-te-1/0/1-48)# spanning-tree edgeport
sw0(conf-if-te-1/0/1-48)# exit
2.9 Disable LLDP iSCSI priority on Switch Ports
sw0(config)#interface TenGigabitEthernet 1/0/1-48
sw0(conf-if-te-1/0/1-48)# no lldp disable
sw0(conf-if-te-1/0/1-48)# no cee
sw0(conf-if-te-1/0/1-48)# no lldp iscsi-priority
sw0(conf-if-te-1/0/1-48)# exit
sw0(config)#exit
2.10 Save configuration
switch#copy running-config startup-config
2.11 Configure additional switch
Repeat the commands from sections 2.1 through 2.10 to configure the second switch.

9 SCG2013 | Brocade VDX 6740 Switch Configuration Guide for Dell SC Series SANs
3Performance tuning
In testing of the VDX 6740 switch using asymmetric flow control (TX off, RX on), the default buffer
allocation of 280KB per port per queue did not yield optimum performance, and significant TCP
retransmits were observed.
With NOS version 5.0.1, system performance can be optimized by increasing TX and RX buffers (per port,
per queue). Optimal performance can be achieved when using a setting of 2MB for receive queue and
2MB for transmit queue per port.
The following instructions show how to configure the receive and transmit buffers.
sw0# configure
Entering configuration mode terminal
sw0(config)# rbridge-id 1
sw0(config-rbridge-id-1)# qos tx-queue limit 2000
sw0(config-rbridge-id-1)# qos rcv-queue limit 2000
sw0(config-rbridge-id-1)# exit
sw0(config)#
Note: Repeat the commands to configure the buffer on the second switch.

10 SCG2013 | Brocade VDX 6740 Switch Configuration Guide for Dell SC Series SANs
4Configuring VCS ID and Rbridge-ID (optional)
Refer to Brocade documentation for details on VCS and Ethernet fabric. The following commands show
the steps to configure the rbridge-id and VCS id to 2 on a switch. The VDX 6740 is in Fabric Cluster mode
by default and configuration change is not required for the mode.
sw0# show vcs
Config Mode : Local-Only
VCS Mode : Fabric Cluster
VCS ID : 1
Total Number of Nodes : 1
Rbridge-Id WWN Management IP VCS Status
Fabric Status HostName
--------------------------------------------------------------------------------
------------------------------
2 >10:00:50:EB:1A:2D:F2:64* 77.77.77.77 Online
Online sw0
sw0# vcs vcsid 2
This operation will change the configuration to default and reboot the switch.
Do you want to continue? [y/n]:y
Note: The switch will reboot.
sw0# vcs rbridge-id 2
This operation will change the configuration to default and reboot the switch.
Do you want to continue? [y/n]:y
Note: The switch will reboot.

11 SCG2013 | Brocade VDX 6740 Switch Configuration Guide for Dell SC Series SANs
AAdditional resources
Dell.com/support is focused on meeting your needs with proven services and support.
DellTechCenter.com is an IT Community where you can connect with Dell customers and Dell employees
for the purpose of sharing knowledge, best practices, and information about Dell products and your
installations.
Referenced or recommended Dell publications:
 Dell EqualLogic Configuration Guide :
http://en.community.dell.com/techcenter/storage/w/wiki/equallogic-configuration-guide.aspx
 Dell Storage Compatibility Matrix :
http://en.community.dell.com/techcenter/storage/w/wiki/5069.dell-storage-compatibility-matrix
For SC Series best practices white papers, reference architectures, and sizing guidelines for
enterprise applications and SANs, refer to:
http://en.community.dell.com/techcenter/storage/w/wiki/5018.compellent-technical-content