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Texiwill
Leadership
Leadership

Hello,

I first size my VMs, then size the LUN based on that.... The formula is:

Size of VMDKs * 2 (to include possible snapshots) + 15mbs (sundry metadata files) + sizeof Allocated Memory + 4GBs (sundry log files) = Size of VM

Size of VM * # of VMs * 1.2 = Space required for LUN with a 20% buffer.

You never want to fill a LUN past 90% and 80% is a much better number. If the VMFS is too full things stop working.

If you have a LUN size already in mind you can determine how many VMs will fit using:

Size of LUN * 0.8 / Size of VMDKS = # of VMs

Yes this sounds like a bit of empty space per LUN but it is a conservative approach for a base #.


Best regards,
Edward L. Haletky
VMware Communities User Moderator
====
Author of the book 'VMWare ESX Server in the Enterprise: Planning and Securing Virtualization Servers', Copyright 2008 Pearson Education.
Blue Gears and SearchVMware Pro Blogs -- Top Virtualization Security Links -- Virtualization Security Round Table Podcast

--
Edward L. Haletky
vExpert XIV: 2009-2023,
VMTN Community Moderator
vSphere Upgrade Saga: https://www.astroarch.com/blogs
GitHub Repo: https://github.com/Texiwill
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