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How To Remove SAN Attached LUNs from RHEL 5 Servers Using powermt

Introduction It is one of those rare occasions where you get to reclaim SAN attached storage instead of giving more. From the EMC side of it you would think no problem. Remove the host from the storage group and un-mount and re-scan on the host and all is good, right? Well no, up rises device in use or not found and powermt check command won’t work. So how do we do it? Read on and see. Steps Several... read more

How To Install and Config PowerPath on RHEL

Introduction PowerPath is EMC licensed software for managing SAN attached storage on your systems. In this post we will cover how to install, license and scan for newly attached storage. Prerequisites Download the PowerPath software from EMC powerlink website. If you’ve purchased EMC support, you should have access to powerlink. For RHEL 4 EMCpower.LINUX-5.3.0.00.00-185.rhel.x86_64.rpm... read more

Retrieving EMC and Qlogic Fiber WWN on RHEL

Introduction So you need to add storage to a RHEL (RedHat Enterprise Linux) server and the storage guy has asked you for the WWN.  The question next is how do I get the WWN off my server? So how do we get QLogic and EMC WWN’s on RHEL. It is a lot easier than one might think. Let’s move forward and get the WWN information we need! Qlogic First identify your installed or recognized, this is... read more

How to List the TDEV Members of a META on VMAX

Introduction So you have created a META and have come to a point where you need to know what TDEV are a member. Either need it for reclaiming of space or any other option.In this post we will explore several commands to get the information you are looking for. Get META Members from a META First list all the meta’s that are in use on the VMAX and look for the device you are interested in getting data... read more

How To Use Consistent_Lun setting on VMAX Initiator Groups

Introduction Using the consistent_lun setting we eliminate the issue where different devices show different lun id’s. This is more prevalent with ESX Hosts. For this to work the flag must be set at creation time of the host and parent initiator groups.  In this post we will cover how to complete the task. Step 1 – Create Host Initiator Groups The first step is to create the host initiator... read more

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