Solved

ESXi 5.1 Path Selection Claim Rules

Posted on 2014-01-15
3
564 Views
Last Modified: 2014-01-16
One of my goals for 2014 is to gain a better understanding of how things really work in VMware.
 
Today's question, path selection policies and Claim Rules. Am I correct when I state the following..

A Claim rules specifics that a specific disk type should default / always be associated with a specific PSP correct?

Also, why would anyone want to specific a PSP on a disk instead of at the volume level..

Thanks Again
0
Comment
Question by:compdigit44
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
3 Comments
 
LVL 121

Accepted Solution

by:
Andrew Hancock (VMware vExpert / EE MVE^2) earned 500 total points
ID: 39784338
The PSA (Pluggable Storage Architecture) uses claim rules to determine with multi pathing modules, to claim which storage devices to apply these rules and plugins.

So inanswer to your question:-

A Claim rules specifics that a specific disk type should default / always be associated with a specific PSP correct?
- Yes this is correct.

Also, why would anyone want to specific a PSP on a disk instead of at the volume level..

If we take an Equallogic LUN from a SAN, for example, the claim rule would identity it's an Equallogic device, and claim the rule, and apply a rule, so it can use a third party Dell plugin to handle multi-pathing for that LUN, e.g. the Dell Equallogic EqualLogic Multipathing Extension Module. (MEM) for VMware® often referred to as the MEM Kit, so custom path selection policy can be used, rather than Round Robin etc to better control Active (I/O) to both LUNs/paths at the same time.

It's quite interesting (if sad like us), if you look at the logs (/var/log/vmkernel.log), and you can see this happening, and the claim rules working in the background.
0
 
LVL 20

Author Comment

by:compdigit44
ID: 39785796
Thanks Hancock!!!!
0
 
LVL 121
ID: 39785800
No problems.
0

Featured Post

What Is Blockchain Technology?

Blockchain is a technology that underpins the success of Bitcoin and other digital currencies, but it has uses far beyond finance. Learn how blockchain works and why it is proving disruptive to other areas of IT.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

In this article we will learn how to backup a VMware farm using Nakivo Backup & Replication. In this tutorial we will install the software on a Windows 2012 R2 Server.
Ransomware is a malware that is again in the list of security  concerns. Not only for companies, but also for Government security and  even at personal use. IT departments should be aware and have the right  knowledge to how to fight it.
Teach the user how to install log collectors and how to configure ESXi 5.5 for remote logging Open console session and mount vCenter Server installer: Install vSphere Core Dump Collector: Install vSphere Syslog Collector: Open vSphere Client: Config…
This Micro Tutorial steps you through the configuration steps to configure your ESXi host Management Network settings and test the management network, ensure the host is recognized by the DNS Server, configure a new password, and the troubleshooting…

627 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question