VMware Cloud Community
DanielJGF
Enthusiast
Enthusiast

Extended volumes virtual disk stickiness

I have looked in the Internet and haven't found an answer to this self posed question:

When you extend a VMFS volume across multiple physical disks. Is there some sort of stikiness of the virtual disks with regards to the physical disks, or the volume will behave like a RAID 0 stripe set and will evenly distribute the data among the disks?

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TomQuinn82
VMware Employee
VMware Employee

VMFS is a filesystem, it is ultimately responsible for responding to VM storage requests and locating a suitable physical storage block to write it too.  It tracks those blocks and logically groups them together, manages r/w access and initiates any formatting required based on the type of VMFS volume you have created (ie EZT, Thin etc) - the physical storage manages RAID and data distribution, VMFS just provides the abstraction.  

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