A VMware Virtual Switch is Layer-2 Switch embedded in VMkernel itself. It’s a virtual network living inside ESX Kernel providing interconnectivity between VMs and the external physical Network via Standard Networking Protocols.
VMFS has always been one of the critical component of Vmware vSphere storage stack as it abstracts the underlying storage and presents it to Virtual Machines in various fomats : virtual disk, passthru RDM, Non-Passthrough RDMs, Snapshots and so on…
Virtual Machines are one of the most important and critical entity of entire datacenter.
If Virtual machine is not working or becomes inaccessible, every other issue whether its Networking, Storage, Cluster etc.. becomes second priority.
Check out Virtual Disk Performance analysis configured with Eager Zero, Lazy Zero and Thin Provisioning Disk Format. We have captured Write measurement performance at VM level and LUN level using esxtop command.
Thin Provisioning is VMware vSphere Technology allows Virtual Disk storage allocation on demand & allocate storage space only when VM needs it.