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Which settings are best with virtualization like VMware, XEN, qemu?

April 26, 2017best QEMU settings virtualization vmware xen

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Which settings are best with virtualization like VMware, XEN, qemu?

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The biggest problem is that those products seem to also virtualize disk writes in a way that even barriers don’t work anymore, which means even a fsync is not reliable. Tests confirm that unplugging the power from such a system even with RAID controller with battery backed cache and hard disk cache turned off (which is save on a normal host) you can destroy a database within the virtual machine (client, domU whatever you call it). In qemu you can specify cache=off on the line specifying the virtual disk. For others information is missing.