How to check WWN and Multipathing on Windows Server

How to check WWN and Multipathing on Windows Server

Introduction

World Wide Name (WWN) and multipathing are crucial elements in storage management for Windows Servers. This guide will walk you through the process of checking WWN and multipathing across different Windows Server versions.

Windows Server 2012-2022

Checking World Wide Names (WWNs) and iSCSI IQNs

Use the following PowerShell command:

Get-InitiatorPort

Checking ISCSI Connections

Execute this PowerShell command:

Get-IscsiTarget

Checking MPIO Connections

For MPIO (Multipath I/O) connections to SAN, use:

mpclaim -s -d

Checking Multipath for Specific Disks

List all disks:

list disk

Check multipath for a specific disk (e.g., Disk 0):

mpclaim -s -d 0

Suggested Read: Top 50 PowerShell Commands for Daily Use

Windows Server 2008

Use the Storage Explorer tool to view:

• FC switches in your storage fabric
• Details about switch port connections
• Information about other servers connected to the storage fabric
• HBA and LUN information

Windows Server 2003/2000

Using FCINFO (Fibre Channel Information Tool)

Run the “fcinfo” command in Command Prompt. It will show up HBA connected to the server with WWN

1. Download FCINFO from Microsoft Download Center
2. Run the following command in the Command Prompt:

fcinfo

This will display HBA information, including WWN.

Model-Based Utilities

Some vendor-specific utilities include:

1. HBAnyware utility
2. SANsurfer utility
3. Hitachi Storage Commands:

dlnkmgr view -path    # Check multipath output
dlnkmgr view -drv     # Check current settings
dlnkmgr set -lb on -lbtype rr    # Set load balancing
dlnkmgr set -pchk on -intvl 10   # Set path Health Checking
dlknmgr set -afb on    # Set Automatic Failback

Conclusion

Understanding how to check WWN and multipathing is essential for efficient storage management in Windows Server environments. By following this guide, you can effectively manage these aspects across various Windows Server versions and utilize vendor-specific tools when necessary.

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