FW: Dear Clouderati Enterprise IT is different…

I hardly ever do this, posting people to a blog post… I was going through my backlog of articles to read when I spotted this article by my colleague Chuck Hollis. I had an article in my draft folder on the subject of web scale myself. Funny enough it so close to Chuck’s that there is no point in publishing it… rather I would like to point you to Chuck’s article instead.

To me personally, the below quote captures the essence of the article really well.

If you’re a web-scale company, IT doesn’t just support the business, IT is the business.

It is a discussion I have had on twitter a couple of times. I think Web Scale is a great concept, and I understand the value for companies like Google, Facebook or any other large organization in the need of highly scalable application landscape. But the emphasize here is on the application and its requirements, and it makes a big difference if you are providing support for hundreds if not thousands of applications which are not build in-house. If anyone tells you that because it is good for Google/Facebook/Twitter it must be good for you, ask yourself what the requirements are of your application. What does your application landscape look like today? What will it look like tomorrow? And what will be your IT needs for the upcoming years? Read more in this excellent post by Chuck, and make sure to leave a comment! Dear Clouderati Enterprise IT is different…


Tour through VMware vCloud Hybrid Service part 1

Last week I received an account for the VMware vCloud Hybrid Services through one of our internal teams. I wanted to play around with it just to see what it can do and how things work, but also to see what the user experience was like, basically a tour through VMware vCloud Hybrid Service. I received my username and a link to set a password via email and it literally took 3 seconds to get started after setting that password. First I was presented with was a screen that showed the regions I had to my disposal as shown below, 4 regions.

You may wonder why that matters, well it is all about availability… Of course each region individually will have done everything there is to be done when it comes to resiliency but what if a whole site blows up? Well that is where multiple regions come in to play. I just want to deploy a small virtual machine for now so I am going to select a random site… I will use Virginia. [Read more…]

Pre-order Essential Virtual SAN through Pearson…

Pre-order Essential Virtual SAN through Pearson today, printed version that is: http://bit.ly/1uxLo7x

“You’ll learn what VSAN is, exactly what it offers you, how to implement it, and how to maximize the value it delivers. Cormac Hogan and Duncan Epping show how VSAN implements object-based storage and a platform for VM storage policies that simplifies VM storage placement decisions. They explain how VSAN integrates with vSphere features such as HA, DRS and vMotion, providing greater resiliency, more scale-out storage functionality, and greater control over QoS.”

vCenter 5.5 Update 1b with OpenSSL and SPBM fix!

For those not monitoring the VMware website like a hawk… VMware just released vCenter 5.5 Update 1b. This update contains a couple of fixes which are critical in my opinion. So make sure to upgrade vCenter as quickly as possible:

  • Update to OpenSSL library addresses security issues
    OpenSSL libraries have been updated to versions openssl-0.9.8za, openssl-1.0.0m, and openssl-1.0.1h to address CVE-2014-0224.
  • Under certain conditions, Virtual SAN storage providers might not be created automatically after you enable Virtual SAN on a cluster
    When you enable Virtual SAN on a cluster, Virtual SAN might fail to automatically configure and register storage providers for the hosts in the cluster, even after you perform a resynchronization operation. This issue is resolved in this release. You can view the Virtual SAN storage providers after resynchronization. To resynchronize, click the synchronize icon in the Storage Providers tab.

You can download the bits here.

Disconnect a host from VSAN cluster doesn’t change capacity?

Someone asked this question on VMTN this week and I received a similar question this week from another user… If you disconnect a host from a VSAN cluster it doesn’t change the total amount of available capacity. The customer was wondering why this was. Well the answer is simple: You are not disconnecting the host from your VSAN cluster, but you are rather disconnecting it from vCenter Server instead! (In contrary to HA and DRS by the way) In other words: your VSAN host is still providing storage to the VSAN datastore when it is disconnected.

If you want a host to leave a VSAN cluster you have two options in my opinion:

  • Place it in maintenance mode with full data migration and remove it from the cluster
  • Run the following command from the ESXi command line:
    esxcli vsan cluster leave

Please keep that in mind when you do maintenance… Do not use “disconnect” but actually remove the host from the cluster if you do not want it to participate in VSAN any longer.