Slow backup of VM on VSAN Datastore

Good post by Duncan Epping (thank you)

Someone at out internal field conference asked me a question around why doing a full back up of a virtual machine on a VSAN datastore is slower then when doing the same exercise for that virtual machine on a traditional storage array. Note that the test that was conducted here was done with a single virtual machine. The best way to explain why this is is by taking a look at the architecture of VSAN. First, let me mention that the full backup of the VM on a traditional array was done on a storage system that had many disks backing the datastore on which the virtual machine was located.

Read on here

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