By Duncan Epping, on May 23rd, 2013%
Last week on twitter someone mentioned he received the error that he had less than two vSphere HA heartbeat datastores configured. I wrote an article about this error a while back so I asked him if he had two or more. This was the case, so next thing to do was to “reconfigure for HA” … … Continue reading →
“Number of vSphere HA heartbeat datastores less than 2 error, while having more?” originally appeared on Yellow-Bricks.com. Follow me on twitter – @DuncanYB.
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By Duncan Epping, on May 14th, 2013%
Last week there was a question on VMTN about VM Monitoring sensitivity. I could have sworn I did an article on that exact topic, but I couldn’t find it. I figured I would do a new one with a table explaining the levels of sensitivity that you can configure VM Monitoring to. The question that … … Continue reading →
“vSphere HA – VM Monitoring sensitivity” originally appeared on Yellow-Bricks.com. Follow me on twitter – @DuncanYB.
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By Duncan Epping, on May 13th, 2013%
A while back I did this article on Storage DRS Interoperability. I had questions last week about this so I figured I would write a new article which reflects the current state (vSphere 5.1). I also included some details that are part of the interoperability white paper Frank and I did so that we have … … Continue reading →
“vSphere 5.1 Storage DRS Interoperability” originally appeared on Yellow-Bricks.com. Follow me on twitter – @DuncanYB.
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By Duncan Epping, on May 9th, 2013%
For years these rumors have been floating around that DRS does not take CPU Ready Time (%RDY) in to account when it comes load balancing the virtual infrastructure. Fact is that %RDY has always been a part of the DRS algorithm but not as a first class citizen but as part of CPU Demand, which … … Continue reading →
“DRS not taking CPU Ready Time in to account? Need your help!” originally appeared on Yellow-Bricks.com. Follow me on twitter – @DuncanYB.
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By Duncan Epping, on May 6th, 2013%
We had a discussion internally on static overhead memory. Coincidentally I spoke with Aashish Parikh from the DRS team on this topic a couple of weeks ago when I was in Palo Alto. Aashish is working on improving the overhead memory estimation calculation so that both HA and DRS can be even more efficient when … … Continue reading →
“What is static overhead memory?” originally appeared on Yellow-Bricks.com. Follow me on twitter – @DuncanYB.
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By Duncan Epping, on April 9th, 2013%
I have been having these discussions with our engineering teams for the last year around guaranteed restarts of virtual machines in a cluster. In the current shape / form we use Admission Control to guarantee virtual machines are restarted. Today Admission Control is all about guaranteeing virtual machine restarts by keeping track of Memory and … … Continue reading →
“Guaranteeing availability through admission control, chip in!” originally appeared on Yellow-Bricks.com. Follow me on twitter – @DuncanYB.
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By Duncan Epping, on March 14th, 2013%
I have had this question many times by now, what is “Current Memory Failover Capacity” that is shown in the cluster summary when you have selected the “Percentage Based Admission Control Policy”? What is that percentage? 99% of what? And … Continue reading →
“What is: Current Memory Failover Capacity?” originally appeared on Yellow-Bricks.com. Follow me on twitter – @DuncanYB.
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By Duncan Epping, on March 8th, 2013%
I had question today about using the advanced settings to set a minimal amount of resources that HA would use to do the admission control math with. Many of us have used these advanced settings das.vmMemoryMinMB and das.vmCpuMinMHz to dictate the … Continue reading →
“Using das.vmmemoryminmb with Percentage Based admission control” originally appeared on Yellow-Bricks.com. Follow me on twitter – @DuncanYB.
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By Duncan Epping, on March 6th, 2013%
Yesterday I was at a Software Defined Datacenter event organized by IBM and VMware. The famous Cormac Hogan presented on Software Defined Storage and I very much enjoyed hearing about the VMware vision and of course Cormac’s take on this. … Continue reading →
“Why the world needs Software Defined Storage” originally appeared on Yellow-Bricks.com. Follow me on twitter – @DuncanYB.
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By Duncan Epping, on March 6th, 2013%
I had a question last week about Storage vMotion and when Write-same vs XCopy was used. I was confident I knew the answer, but I figured I would do some testing. So what was the question exactly and the scenario … Continue reading →
“Write-Same vs XCopy when using Storage vMotion” originally appeared on Yellow-Bricks.com. Follow me on twitter – @DuncanYB.
. . . → Read More: Write-Same vs XCopy when using Storage vMotion
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