Recent Posts

SIOC considerations with mixed HBA environments

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I’ve been involved in a few conversations recently related to device queue depth sizes. This all came about as we discovered that the default device queue depth for QLogic Host Bus Adapters was increased from 32 to 64 in vSphere 5.0. I must admit, this caught a few of us by surprised as we didn’t Read more...

New Storage Enhancements in vSphere 5.1U1

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vSphere 5.1 Update 1 is now available. For those of you running 5.1, there are a lot of critical fixes and enhancements, so I’d urge you to review the release notes and consider scheduling a slot to upgrade your infrastructure to this new release. There are updates for both vCenter and ESXi in this release. Read more...

Virtual Machine I/O – Fairness versus Performance

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Many of you will have read various articles related to queue depths, especially in the area of LUN/device queue depths, and how these can be tuned to provide different performance for your I/O. However there are other queue settings internal to the VMkernel, which relate to how many I/Os a Virtual Machine can issue before Read more...

Italian VMUG – April 3rd, 2013 – Milan

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This is one for our Italian readers. If you are a VMware user and reside in Italy, we are having a great Italian VMUG event in Milan on April 3rd, next month. I will be presenting on VMware’s Software Defined Storage vision, and giving some insight into some of the features VMware is currently working Read more...

ESXi Slow Boot with MSCS

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This is an issue that has come up time and time again. The basic gist of the problem is that when there are Microsoft Cluster Service (MSCS) virtual machines deployed across ESXi hosts (commonly referred to as Cluster Across Boxes or CABs), the virtual machines are sharing access to disks which are typically Raw Device Read more...

New NFS Best Practices Whitepaper available

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A new NFS best practices white paper is now available. The paper looks at all aspects of using NFS in a vSphere environment. The paper was created with the assistance of our partners from EMC (Isilon), HDS & NetApp, and tries to find common agreement as to what are the best practices. It discusses networking Read more...

VSA Licensing Explained

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There have been a number of queries recently in relation to licensing of the VSA with the 5.1 release. The VSA has a number of different licensing models depending on how it was obtained. In many cases, if you check your vSphere licenses via the vCenter License Administration view, you might observe that the VSA Read more...

QLogic HBA Firmware Versions

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A question that I used to get quite regularly popped up again in the past week. It was basically a query about the version of firmware on QLogic 24xx & 25xx HBAs, and should customers flash/upgrade the firmware to newer/later versions? The first thing to note is that the firmware for the QLogic HBAs is Read more...

PEX 2013 Storage Picks

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As many of you are already aware, PEX, the VMware Partner Exchange for 2013 is almost upon us. As usual, I decided to call out a number of sessions which I thought you might be interested in attending from a storage perspective, if you are indeed attending PEX. Read more...

Recent changes to QFullSampleSize and QFullThreshold

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There have been a number of changes to the advanced parameters QFullSampleSize and QFullThreshold recently that I wanted to call out. Initially, these parameters were set globally, which meant that every LUN from every array accessed by the ESXi host were affected by changes to these parameters. In 5.1, we introduced a mechanism to change Read more...