I noticed a discussion on an internal mailinglist which mentioned the advanced setting “Disk.UseDeviceReset” as it is mentioned in the FC SAN guide. The myth that you need to set this setting to “0 “in order to allow for Disk.UseLunReset to function properly has been floating around too long. Lets discuss first what this options does. In short, when an [...]

It seems to be survey month…. Nevertheless this survey will take you a couple of minutes and is about Virtual Machine Storage and Snapshots. Most of our PMs are currently revising / updating and prioritizing the roadmap and real customer data and opinions are always welcome to define these. We would appreciate it if you could take 5 minutes of [...]

Disclaimer: Now, lets make this very clear. Don’t touch “useANO” unless you are specifically instructed to do so, this article is just for educational purposes. I had some issues in my lab with an ALUA array. (If you have no clue what ALUA is, read this post.) As you hopefully know with an ALUA array you typically have 4 paths. [...]

This week I had a call with a new and exciting company called Tintri. Tintri has been flying under the radar for the last couple of years and has worked really hard to develop a new product. Tintri was founded by some of the smartest kids on the block one of which is their current CEO and former EVP of [...]

Today I was fooling around with my new Lab environment when I noticed my Path Selection Policy (PSP) was set to fixed while the array (Clariion CX4-120) most definitely supports Round Robin (RR). I wrote about it in the past(1, 2) but as with vSphere 4.1 the commands slightly changed I figured it wouldn’t hurt to write it down again: [...]

I was asked why Data Recovery was only running one single job at a time instead of multiple concurrent. After some investigations I found out that the administrator changed the configured memory for the appliance to 8Gb where 2Gb is the default. The Knowledge base article clearly states the following about this: This issue may occur if the configuration of [...]

Yes not only Chad Sakac deals with face melting ultra uber geeky cool stuff I do as well (those on twitter know what I am referring to), but unfortunately I cannot share the details on some of the stuff I am working on. I can however provide you a link which contains the papers written by  the engineers on some [...]