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Category: ESXi (Page 3 of 4)

ESXi host performance vs. power consumption

In my last training Fabian Lenz and I discuss pro and con of  power management in ESXi.

We thought DPM is mostly used in VDI-environments. In those environments the savings would be the best, because the virtual desktops didn’t work at night and many of the ESXi hosts could be powered off. But DPM ist not the only thing which affects the power consumption. ESXi could use ACPI C- and P-States from the CPU to control the power of the physical cores. Fabian experiements with a bigger VDI environment and gets interessting informations with activated DPM (watch his blog).

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reclaim deleted blocks in VMFS on thin-provisioned LUNs

In vSphere 5.5 and 6.0 a new command was given to esxcli. With this command you can reclaim deleted blocks on thin-provisoned LUNs.

You could run the mechanism in production time. This might sound good…. Our maintainance windows gets smaller and smaller with every new service and if you could do maintainance when everybody could work is that great.

BUT one moment!

The ESXi host which runs the reclaim would get very high cpu usage and might costops VMs within the host. Especially the first run will take a lot of time.

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