Category Archives: VMware

How to enable SSH on a VMware 5.5 ESXi host using the vSphere client

virtual machine

Recently I needed to make some edits on vmdk files in order to get rid of a reference to the change tracking files, as mentioned in Gabrie’s post: Cannot open the disk and could not open change tracking file. An SSH connection to a VMware ESXi host was required. SHH was disabled and I needed to enable it temporarily.

How to enable SSH on an ESXi host using the vSphere client

In vSphere, select the host you want to enable SSH on.

Select the “Configuration” TAB, then “Security Profile”. In the upper right select “Properties.

A new window opens, now select SSH (you may need to scroll down a bit) and in the lower right select “Options”.

Again a new window opens and here you can either “Start” or “Stop” the SSH daemon.

enable SSH

Free EMC trial software / virtual appliances

virtual machine

A quick heads-up this time about building your own lab environment

Sometimes you just want to run a VNX, Avamar, PowerPath, Data Domain or Isilon as a virtual machine to see how things work, or to write work instructions. And EMC offers a lot of these virtual appliances for free!

Take a look at these:

 

EMC Unity: simplicity redefined

EMC Unity

It’s been a while since the VNX2 was born: September 2013, I remember it very well. Being a part of the EMC Elect, I was invited to be at the actual launch in Milan (Italy) and what a ride it was! The whole launch was wrapped around Formula 1 technology and it sure was “speed 2 lead“. That “old” VNX2, which I’m still perfectly happy with by the way, was a revolution in my humble opinion: multi-core everything, in short MCx. And yes, it was like everything just went faster, smoother and better.

New technologies

But with new technologies popping up every so many months now, it was time for a new mid-range storage array. Flash storage isn’t a novelty anymore, it’s a must! And the “old” hybrid arrays were fine, but needed some fine-tuning. With flash devices growing bigger every quarter or half a year and faster as well, the whole back-end needed an upgrade. The old 6 Gb back-end (x4) needed an upgrade.

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EMC World 2016: what to do? There’s not enough time, that’s for sure!

Las Vegas

Will this be the last EMC World ever? I can’t imagine that.

Some say this year will be the final EMC World. Ever. But then again, there might not be another Dell world either. Not in this format anyway. Will EMC World continue in another format, or will it be called DEll/EMC World? Maybe EMC/Dell World? Or just World? No, that doesn’t make sense at all.

Anyway,

let’s think out loud about EMC World 2016

What’s going on from May 2 to May 5?

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The EMC / Dell merger: my tears and thoughts

Dell EMC

It’s been a few weeks now since Mr Dell, Silver Lake and MSD Partners announced they want to take over EMC and with that become the world’s largest privately held IT company. For me I relived the whole HP / Compaq merger and at that time Compaq was my favorite company. My whole world collapsed. What was going to happen to the world I lived in? It was going to disappear! But luckily it did not. The best pieces of Compaq at the time, their servers, were simply rebranded and sold as HP Proliants and the Alpha CPU “suddenly” appeared as the Itanium from Intel. And everybody was happy. Well, sort of. At least the server department kept on delivering what they were famous for.

And now this happened

I never realized Michael Dell was even in a position to actually raise that kind of money. But with help from Silver Lake and MSD Partners he succeeded to raise sixty five Billion US Dollars! Just imagine! Oh, wouldn’t I like to get my hands on a small portion of that!! But that’s a whole other story. Forget the money, forget the stock exchange market: what will this mean for both companies and the people working there? As some of you know, I’m involved with both the EMC education department as well as the customer facing piece of EMC Support and I want to share my thoughts on the future of my current “Compaq” equivalent, aka “EMC”.

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Want to play around with VMware VVOLs? Here’s your chance! The Software Defined VNX is here!

Hard Drive

VMware now has this great new feature to be more in control of where its data blocks actually land on the storage system: VVOLs. But up until now EMC didn’t have a system capable of actually providing the back end for that. Until now I said. Starting with the VNXe 3200 all storage arrays are made vVOL capable and you can play around with that yourself. FOR FREE!

The Software Defined VNX is now a reality!

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Going to EMC World 2015? Take a free EMC Proven Professional exam!

EMC Proven Professional

Free exams at EMC World in May 2015

EMC Proven Professional

Are you visiting EMC World 2015 in May in Las Vegas this year?

Always wanted to take a Proven Professional exam? EMC offers a free first attempt on any exam you choose!

Also being offered this year… VCE Certified Professional and VMware certification exams!! So take your shot and get certified!

Space is limited – pre-register for your exam today! Take a look at the official registration page at the Pierson Vue website: http://pearsonvue.com/emc/emcworld/?linkId=12480718

Optimizing performance using VAAI and the ESX MaxHWTransferSize setting

xcopy transfer size

If you’re running an EMC VNX using a lower version than block OE version 05.32.000.5.209, you might want to upgrade to the latest and greatest version (patch 209 or newer). The 209 offers EMC’s latest fixes and enhancements for VAAI performance. Many of the found performance issues have been fixed in the 209 code. However, in some environments sub-optimal performance has been detected with xcopy operations, or in some cases with the performance of non-xcopy IO during xcopy operations to the same pool.

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Fixing misalignment without moving data

Fixing misaligned partitions

It’s quite an old topic, but I recently found a great tool which allows you to re-align partitions without the need to manually move data from the misaligned disk to a new aligned disk.

First of all I must add that all the credits go to Nicholas Weaver, since he wrote the original blog and the actual tool!

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How to translate Windows disk ids to storage array’s LUNs

Converting disk information in a VM into the actual LUN information

We’ve all been there: you have a certain Windows virtual machine with several disks of the same size and you don’t know which Windows-disk is in fact which storage LUN.

The VMware settings for this VM might look like this:

VM-config

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Live VMware datastore expansion with running VMs

How to enlarge datastore capacity in Virtual Center?

There are several ways to get more disk storage available for your VMs running on VMware ESX. Adding an extra datastore is an option, but having multiple datastores creates an extra administrative overhead since you now have multiple datastores to monitor.

Another option is to simply extend an existing datastore. Live!

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VMware: “adaptive queue depth” setting

What is the recommended LUN queue depth throttling in VMware ESX/ESXi?

According to EMC this “adaptive queue depth” setting is not yet supported (June 2013). The full article can be found on this link. It is known as Primus solution id emc279718.

My advice would be not to use this setting until EMC certifies this setting for use with their arrays.

The exact Article is as follows:

What is the recommended LUN queue depth throttling in VMware ESX/ESXi?
 
  • Need to know QFullThreshold,QFullSampleSize & Queue Fulls values for VMware.
  • Host Connectivity Guide does not include any standard values.
  • Performance issues.
 
OS: VMware ESX / ESXi
Product: CLARiiON / Symmetrix and I assume VNX as well
 
According to Engineering, enabling the adaptive queue depth algorithm is NOT documented in the Host Connectivity Guide or the EMC Support Matrix.
The recommendation is to use the default setting which is disable adaptive queue depth.
Additional checks with E-Lab VMware quality engineers, E-Lab testing is done with the default setting.
 
See emc274169 for additional information and or changes.  Also see these two documents on support pages support.emc.com or Powerlink.Using EMC VNX Storage with VMware VsphereUsing EMC Clariion Storage with Vmware Vsphere & VMware Infracture Version 4.0

2 Free vSphere ebooks on Amazon! On June 5 and 6 2013 only!!

2 Free ebooks @Amazon

Generally I don’t want to abuse a blog to advertise for certain goods, but I’ve found 2 good ebooks for you VMware lovers:

  1. VMware vSphere 4.1 HA and DRS Technical deepdive (http://amzn.to/hwUFhA)
  2. VMware vSphere 5 Clustering Technical Deepdive (http://amzn.to/om16q1)

Make sure you check the Kindle version, since today and tomorrow it will be for $0, so that’s a good deal, don’t you think?

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