444 vnx unifiedimp_m03 managing host access to block storage

Copyright © 2011 EMC Corporation. All Rights Reserved.

Module 3: Managing Host Access to Block Storage

Upon completion of this module, you should be able to:

• Define Access Logix

• Explain Access Logix functionality

• Explain LUN masking and LUN mapping

• Identify initiator and connectivity entries

• Enable Access Logix

• Create and manage storage groups

Managing Host Access to Block Storage 1


Module 3: Managing Host Access to

Block Storage

During this lesson the following topics are covered:

• Define Access Logix

• Explain Access Logix functionality

• Explain LUN masking and mapping

• Identify initiator and connectivity entries

• Enable Access Logix

• Create and manage storage groups

Lesson 1: Access Logix


Copyright © 2011 EMC Corporation. All Rights Reserved. Managing Host Access to Block Storage - 3

Access Logix – Definition

• Storage system-based licensed software

• Enhances the VNX Operating Environment for Block

• Factory preinstalled on all VNX arrays

• Uses Enabler


Access Logix Functionality

• LUN masking

• Presents a ‘virtual storage system’

• Maps VNX LUNs to host LUNs

• Manages the Access Control List

• Manages Initiator Registration Records

Access Logix database entries


Access Logix Limits

• Host may be in 1 storage group per storage system

• Maximum of 4 storage systems per host

• Number of hosts per storage system – varies

• A storage group is local to 1 storage system

• Maximum number of LUNs in a storage group

VNX5100 – 256, VNX5300/5500 – 512, VNX 5700/7500 - 1024

• (Optional) Host agent provides LUN mapping

• User must be authorized to manage Access Logix

Privileged User list or Navisphere Security file


LUN Masking and LUN Mapping


ALU 0

ALU 7

ALU 1

ALU 2

ALU 3

ALU 4

ALU 5

ALU 6

Storage

Group A

Storage

Group B

HLU 0

HLU 1

HLU 2

HLU 3

HLU 0

HLU 1

HLU 2

HLU 3

Physical

Storage Array

Translation

table

Virtual Storage

systems

Storage Groups

Servers

Server A

Server B


Initiator Registration Records - Fibre

• Number of initiators is model dependent

• Each HBA or CNA port that is zoned to an SP port is one path to that SP and the storage system containing that SP

• Each path consumes one initiator record

• Access from a server to a SP in a storage system can be either single path, multipath, or alternate path

• Some HBAs and CNAs have two ports


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


Initiator Registration Records - iSCSI Names

• iSCSI address

Uniquely identifies nodes

Two variations

• iqn. – iSCSI Qualified Name (IQN)

iqn.1992-04.com.emc:cx.fcntr073900083.b4

iqn.1992-04.com.emc:cx.fcntr073900083.a4

• eui. – Extended Unique Identifier (EUI)

eui.50060162AEA5574E


Access Control Lists – Fibre Channel

• LUN UID - 128 bits Globally unique - will never be re-used Example:

60:06:01:60:08:F0:1E:00:BA:48:55:90:46:3D:DD:11

• Host HBA WWN - 128 bits Static Example:

20:00:00:00:C9:3D:A6:5C.x.x.x.x.x.x.x.x.

• VNX SP port WWN - 128 bits Static Example:

50:06:01:60:BB:60:01:4C:50:06:01:62:3B:60:01:4C

• Host access request forces a lookup to find a match If OK, host is allowed access If no match, host is denied access


Access Control Lists – iSCSI

• LUN UID - 128 bits Globally unique - will never be re-used Example:

60:06:01:60:08:F0:1E:00:BA:48:55:90:46:3D:DD:11

• Host IQN or EUI Persistent iSCSI provides two name formats for

different types of naming authorities: Examples:

iSCSI Qualified Name (IQN) Format: iqn.yyyy-mm.{reversed

domain name} Extended Unique Identifier (EUI)

Format: eui (e.g. eui.02004567A425678D)

• VNX port IQN or EUI - Static Example: iqn.1992- 4.com.emc:cx.fcntr00100003.a4


Automatic Registration

• Registration is the name given to the process of making a host known to the storage system

• 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

• The Unisphere Host Agent tells the VNX about either the: Hostname and HBA WWNs

Hostname and Host IQN or EUI

• The VNX can tie together this information ‘virtual connection’ from the host includes all initiators (hardware

or software based)


Connectivity Status – Host Initiators


Manual Registration – Edit


Enabling and Disabling Access Logix


Steps for Managing Storage Groups

• Creating storage groups

• Viewing and changing storage group Properties

• Adding and removing LUNs

• Connecting and disconnecting hosts

• Destroying storage groups


Creating a Storage Group

Highlighting an existing

group enables the tabs

below


Adding LUNs to a Storage Group


Changing the Host ID on a LUN


Deleting a Storage Group


Module Summary

Key points covered in this module:

• Access Logix

• Access Logix functionality

• LUN masking and LUN mapping

• Initiator and connectivity entries

• Navisphere Secure CLI commands for Access Logix

• Storage groups


Check Your Knowledge

• What is the maximum number of storage systems a host can be connected to? 1

2

4

8

• How many bits make up a LUN UID? 32

64

128

256



Check Your Knowledge - Answers

• What is the maximum number of storage systems a host can be connected to? 1

2

4 ***

8

• How many bits make up a LUN UID? 32

64

128 ***

256



Check Your Knowledge

• Under what conditions can users delete a storage group?

No LUNs present in the group

No Hosts are connected to the group

Only with Navisphere Secure CLI

Engineering mode only

• Which two functions are performed by Access Logix?

LUN masking, LUN creation

Managing ACLs, LUN masking

LUN Zoning, LUN creation

LUN masking, user authentication



Check Your Knowledge - Answers

• Under what conditions can users delete a storage group?

No LUNs present in the group

No Hosts are connected to the group ***

Only with Navisphere Secure CLI

Engineering mode only

• Which two functions are performed by Access Logix?

LUN masking, LUN creation

Managing ACLs, LUN masking ***

LUN Zoning, LUN creation

LUN masking, user authentication



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444 vnx unifiedimp_m03 managing host access to block storage

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