By Duncan Epping, on April 17th, 2012%
Last week when the Storage vMotion / HA problem went public I asked both William Lam and Alan Renouf if they could write a script to detect the problem. I want to thank both of them for their quick response and turnaround, they cranked the script out in literally hours. The scripts were validated multiple times in a VDS environment [...]
. . . → Read More: Scripts release for Storage vMotion / HA problem
By Duncan Epping, on April 16th, 2012%
I had a question last week, and it had me going for a while. The question was if “das.perHostConcurrentFailoversLimit” could be used to lower the hit on storage during a boot storm. By default this advanced option is set to 32. Meaning that a max of 32 VMs will be restarted by HA on a single host. The question was [...]
. . . → Read More: Limiting stress on storage caused by HA restarts by lowering restart concurrency?
By Duncan Epping, on April 13th, 2012%
<Update>I asked William Lam if he could write a script to detect this problem and possibly even mitigate it. William worked on it over the weekend and just posted the result! Head over to his blog for the script! Thanks William for cranking it out this quick! For those who prefer PowerCLI… Alan Renouf just posted his version of the [...]
. . . → Read More: Clarifying the SvMotion / VDS problem
By Duncan Epping, on April 11th, 2012%
<Update>I asked William Lam if he could write a script to detect this problem and possibly even mitigate it. William worked on it over the weekend and just posted the result! Head over to his blog for the script! Thanks William for cranking it out this quick! For those who prefer PowerCLI… Alan Renouf just posted his version of the script! Both [...]
. . . → Read More: HA fails to initiate restart when a VM is SvMotioned and on a VDS!
By Duncan Epping, on April 10th, 2012%
At the end of 2010 I wrote an article about cluster sizes… ever since it has been a popular article and I figured that it was time to update it. vSphere 5 changed the game when it comes to sizing/scaling of your clusters and I this is an excellent opportunity to emphasize that. The key take-away of my 2010 article [...]
. . . → Read More: Cluster Sizes – vSphere 5 style!?
By Duncan Epping, on April 5th, 2012%
Today I noticed a lot of people end-up on my blog by searching for an error which has got to do with HA heartbeat datastores. Heartbeat datastores were introduced in vSphere 5.0 (vCenter 5.0 actually as that is where the HA agent comes from!!) and I described what it is and where it comes in to play in my HA [...]
. . . → Read More: The number of vSphere HA heartbeat datastores for this host is 1 which is less than required 2
By Duncan Epping, on April 4th, 2012%
An update to the recently released fling vBenchmark was just posted. This update includes some fixes and a feature request which was heard often… Here is what’s new/fixed with 1.0.1: Added a checkbox to include or exclude vCenter license keys when submitting the data to the community repository The application now listens on port 443 (https), requests to port 80 [...]
. . . → Read More: Fling: vBenchmark 1.0.1 just released
By Duncan Epping, on April 3rd, 2012%
I’ve read this several times by now, so I figured I would share it with you. Hopefully most of you will already be aware though at this point as several people blogged and tweeted about it. The VMware Technical Journal is a new publication for the company. We are looking forward to producing future journal issues at regular intervals to highlight the [...]
. . . → Read More: VMware Technical Journal, download it now!
By Duncan Epping, on March 29th, 2012%
I just received a note that the DR paper for vCloud Director is finally available in both epub / mobi format. So if you have an e-reader make sure to download this format as it will render a lot better then a generic PDF! Description: vCloud Director disaster recovery can be achieved through various scenarios and configurations. This case study [...]
. . . → Read More: Update: VMware vCloud Director DR paper available in Kindle / iBooks format!
By Duncan Epping, on March 27th, 2012%
Although this is a corner case scenario I did wanted to discuss it to make sure people are aware of this change. Prior to vSphere 5.0 Update 1 a virtual machine would be restarted by HA when the master had detected that the state of the virtual machine had changed compared to the “protectedlist” file. In other words, a master would [...]
. . . → Read More: Slight change in “restart” behavior for HA with vSphere 5.0 Update 1
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