Posts Tagged ‘drs’

CPU/MEM Reservation Behavior

Again an interesting discussion we had amongst some colleagues (Thanks Frank, Andrew and Craig! Especially Craig as most text below comes from The Resource Master). The topic was CPU/Memory reservations and more specifically the difference in behavior of these two.
One would expect that both a CPU and Memory reservation would have the same behavior when [...]

Custom shares on a Resource Pool, scripted

We’ve spoken about Resource Pools a couple of times over the last months and specifically about shares. (The Resource Pool Priority-Pie Paradox, Resource Pools and Shares.) The common question I received was how can we solve this. The solution is simple: Custom Shares.
However, the operational overhead associated with custom shares is something most people want [...]

Resource Pools and Shares

I just wanted to write a couple of lines about Resource Pools. During most engagements I see environments where Resource Pools have been implemented together with shares. These Resource Pools are usually labeled “Low”, “Normal” and “High” with the shares set respectively. This is the traditional example being used during the VMware vSphere / VI3 [...]

DRS Deepdive Blog page

Over the last week I received a whole bunch of requests to turn the DRS Deepdive articles in a “blog page” so that they would appear up in the menu. That’s what I just did, so you guys can easily find the info you are looking for. I will also try to add a diagram [...]

DRS Deepdive part II

Yesterday I posted the DRS Deepdive. One of the questions still left open was how DRS decides which VM to move to create a balance cluster. After a lot of digging for non-NDA info I found this “procedure” in a VMworld presentation(TA16) amongst some other cool info.
The following procedure is used to form a set [...]

DRS Deepdive

Last week I mentioned which metrics DRS used for load balancing VMs across a cluster. Of course the obvious question was when the DRS Deepdive would be posted. I must admit I’m not an expert on this topic as like most of you I always took for granted that it worked out of the box. [...]

Which Metrics does DRS use?

I received a question a while back about DRS initiated VMotions. One of my customers wanted to know which metrics were used by DRS for deciding if a VM needs to be VMotioned to a different host or not. These metrics are:
Host CPU: Active (includes run and ready Mhz)
Host Memory: Active
Just a little something [...]

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