Copyright © 2014 EMC Corporation. All Rights Reserved. Linux Host Installation and Integration for Block Upon completion of this module, you should be

Copyright © 2014 EMC Corporation. All Rights Reserved.

Linux Host Installation and Integration for Block

Upon completion of this module, you should be able to:• Describe Linux storage connectivity limits and guidelines• Describe the implementation of Linux FC connectivity• Describe the implementation of Linux iSCSI connectivity

Linux Host Installation and Integration for Block 1



This lesson covers the following topics:• Linux system limits and guidelines• Linux HBA utilities• Linux data alignment

Lesson 1: Linux storage connectivity



Linux Connectivity: Requirements

• One or more VNX storage systems• One or more Linux hosts• Supported HBAs, HBA drivers, switches and cables• Correctly configured switch zoning• Correctly configured network• A management station in the environment

Supported host and OS Supported browser Supported JRE Network connectivity to storage systems

3Linux Host Installation and Integration for Block


Operating System Limits and Guidelines

• 16 Fibre Channel initiator ports per Linux host (Single or dual ported)• No mixing of HBAs from different vendors or HBAs with different PCI-interfaces (PCI-Express

with PCI-X HBAs)

Host Initiators

SAN connections used for multipathing must be homogenous

• The number of logical units seen by a host system is dependent on the OS SCSI scan algorithm and HBA LUN scan limits

Logical Units

Supported Protocols: Fibre Channel, Fibre Channel over Ethernet (FC0E), and iSCSI



Host HBA Utilities

• Depending on the supported HBA one of the following utilities can be used to view host connectivity Emulex HBAs: OneCommand Manager Qlogic: SANsurfer CLI or GUI Brocade: Host Connectivity Manager



Emulex OneCommand Manager: Port Information



OneCommand Manager: Target Mapping tab



Qlogic SANsurfer scli example



Brocade Host Connectivity Manager



Using fdisk to Align a Linux Partition

2048

Select the primary partition

Enter expert mode

Offset to the begin at 128

Write the changes to disk

Create a new partition




During this lesson the following topics were covered:• Linux system limits and guidelines• Linux HBA utilities• Linux data alignment

Lesson 1: Summary




This lesson covers the following topics:• VNX FC connections to a Linux host• VNX FCoE connections to a Linux host• VNX iSCSI connections to a Linux host

Lesson 2: Linux FC and iSCSI Connectivity



Viewing Block Storage Ports



Initiator Registration Records: Fibre

Number of initiators is model dependent

• Some HBAs and CNAs have two ports• Each path consumes one initiator record

An initiator is an HBA or CNA port that can access the storage system• Single path• Multipath• Alternate path

Access from a server to an SP in a storage system can be:



Initiator Registration Records Format: Fibre Channel• Hostname• Host IP address• Host HBA WWNs

128 bit number - WWNN + WWPN

• VNX port WWNs 128 bit number - WWNN + WWPN

• Operating system type Allows appropriate response to host SCSI commands



Unisphere Host Initiators: Fibre



Initiator Information: Fibre



Emulex hbacmd listbas and targetmappings commands

VNX port numbers



Qlogic SANsurfer scli example



Viewing SP Fibre Channel Port Properties



Linux Servers and FCoE CNA Adapters



Initiator Registration Records: iSCSI Names

• iSCSI address Uniquely identifies nodes Two variations

iqn. – iSCSI Qualified Name (IQN) iqn.1992-04.com.emc:cx.fnm00130702376.a5 iqn.1992-04.com.emc:cx.fnm00130702376.b5

eui. – Extended Unique Identifier (EUI) eui.50060162AEA5574E



Linux iSCSI NIC Initiator File and Target Discovery• Each server connected to an iSCSI storage system must have a

unique iSCSI initiator name for its NICs• Linux iSCSI driver gives the same name to all NICs in a server• /etc/initiatorname.iscsi

Displays the host iscsi iqn initiator name

• /var/lib/iscsi/nodes Displays discovered iSCSI target ports and iqn identifier



Linux initiator and target discovery commands

Display iscsi initiator name

Display iscsi target port iqn names

Displays iscsi network IP address

Directory for iscsi node information



Unisphere Host Initiators: iSCSI



Initiator Information: iSCSI

Click icon to add picture



Viewing iSCSI Front-end Port Properties




During this lesson the following topics were covered:• VNX FC connections to a Linux host• VNX FCoE connections to a Linux host• VNX iSCSI connections to a Linux host

Lesson 2: Summary




This lesson covers the following topics:• Implementing Linux FC Connectivity• Implementing Linux iSCSI Connectivity

Lesson 3: Implementing Linux Connectivity



Linux Connectivity Steps

Check and validate all host to VNX connectivity• OCManager utility

(Emulex)• SANsurfer (Qlogic)• Unisphere Initiators • naviseccli –h <SP IP

address> port –list –hba

• Unisphere Server Utility for iSCSI

Create a storage

group, add LUNs and

connect your Linux host

Perform a LUN scan or reboot the host to see the newly

provisioned LUNs

Run fdisk • Partiton

disk• Create a

file system• Mount the

file system

Linux Host Installation and Integration for Block - 30


Host Registration

Registration makes a host known to the storage system

• Automatically• Manually

Connectivity depends on the protocol being used:

• Fabric logins tell the VNX which ports and HBAs are connected• iSCSI logins tell the VNX which ports and initiators (hardware or

software based) are connected



Unisphere Host Agent InstallationDownload the latest software

EMC Online Support website

Verify that host agent is installed:

rpm –qa | grep UnisphereHostAgent*

Same procedures are used to download and install other packages (Navisphere CLI, Unisphere Server Utility, admsnap)

Agent can be started and stopped • /

etc/init.d



Configuring the Unisphere Host Agent

• Host agent configuration file must include an entry that defines the user who will issue the CLI commands as a privileged user



Hostagent Commands


• Hostagent can be: Started Stopped Verified

Execute the ./hostagent command/s from the /etc/init.d directory

Verify agent status

Stop the agent

Verify the hostagent process is stopped

Start the agent

Verify the hostagent is running

34


Verify Host Agent with Unisphere


Selecting the LUN Status tab and clicking on Updateproduces a Error when the agent is not available.

35


Naviseccli port and getagent Commands



Unisphere Server Utility



Creating a Storage Group



Adding LUNs to a Storage Group



Adding Hosts to a Storage Group



LUN Scanning

• Mechanisms for reconfiguring devices on a Linux host System Reboot

# reboot HBA driver reload Echoing the SCSI device list in /proc Executing a SCSI scan function through attributes exposed

to /sys SCSI scan through HBA vendor scripts

lun_scan for Emulex



• After a reboot or bus rescan, verify the LUN is available to the OS by opening the scsi file from the /proc/scsi directory. LUN 60 is now available.

Verifying LUNs after a reboot or rescan: /proc/scsi

LUN as viewed in the storage group Selected LUNs



Create and mount a Linux File System mkfs.ext3 to create a file system on the emcpower partiton

mkdir to make a directory and mount the file on the directory

Use touch <data> to write data to the mounted file system



Linux iSCSI CHAP Configuration

Initiator or Mutual CHAP

Enable CHAP security for the NIC or iSCSI HBA before configuring CHAP on the storage system

CHAP data on the target must be the same on each NIC initiator.

Linux/driver revisions use different utilities and/or configuration files

iscsi.conf file (RH 4)

iscsiadm command for (RH 5 )




During this lesson the following topics were covered:• Implementing Linux FC Connectivity• Implementing Linux iSCSI Connectivity

Lesson 3: Summary



Summary

Key points covered in this module:• Connectivity requirements include:

Supported HBAs, HBA drivers, vendor management software, and proper cabling to the fabric switches.

Fabric switches properly configured and zoned Management station with supported OS, Web Browser, Java, and

network connectivity to the VNX.

• Several configuration are key to successful host integration, such as initiator records and port properties

• Steps to implement Linux connectivity in both a Fibre Channel and iSCSI environment.


Documents

Copyright © 2014 EMC Corporation. All Rights Reserved. Linux Host Installation and Integration for Block Upon completion of this module, you should be