Erwin_Zavala
Contributor
Contributor

why do I need a local VMFS?

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I am installing on local drive but connected to a SAN for VM storage. why does the installation of ESX create a local VMFS datastore??

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weinstein5
Immortal
Immortal

Welcome to the forums - as the other poster pointed out you really do not need it - but it is helpful occasionally to have it - the one thing to keep in mind is that if you do place a VM on local storage and this includes placing the vm's vmkernel swap file you would not be able to vmotion that vm or have it as part of a DRS/HA cluster

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blp848
Enthusiast
Enthusiast

You really don't need it. But it is useful for extra space to place patches and upgrades. It also can be used for swap space for the virtual machines with VI 3.5.

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weinstein5
Immortal
Immortal

Welcome to the forums - as the other poster pointed out you really do not need it - but it is helpful occasionally to have it - the one thing to keep in mind is that if you do place a VM on local storage and this includes placing the vm's vmkernel swap file you would not be able to vmotion that vm or have it as part of a DRS/HA cluster

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TomHowarth
Leadership
Leadership

Firstly welcome to the forums.

There is no actual requirement for local storage, unless you are virtualising MSCS, where it is a requirement, that said with disk sizes are they are today a spare 100GB's of storage over your Hosts could be very useful if you found your LUNs were too small as you could move your virtual machines to local storage, while you or your SAN admin create larger LUN,s

Tom Howarth

VMware Communities User Moderator

Tom Howarth VCP / VCAP / vExpert
VMware Communities User Moderator
Blog: http://www.planetvm.net
Contributing author on VMware vSphere and Virtual Infrastructure Security: Securing ESX and the Virtual Environment
Contributing author on VCP VMware Certified Professional on VSphere 4 Study Guide: Exam VCP-410
williamarrata
Expert
Expert

During the installation you can move it from the default location which is usually the primary partition and move it to the extended partition so that once you have edited your partitioning the way you want, take up the rest of the drive with vmfs-3 partition. Now as everyone one else said, here you can use it as you need.

Hope that helped. Smiley Happy

Hope that helped. 🙂
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weinstein5
Immortal
Immortal

Tom - actually just learned with Update 1 - using a local VMFS is no longer required for MSCS in VI-3

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TomHowarth
Leadership
Leadership

You are correct, however the original poster had not mentioned the version of ESX, Smiley Happy so I was just covering bases.

Tom Howarth

VMware Communities User Moderator

Tom Howarth VCP / VCAP / vExpert
VMware Communities User Moderator
Blog: http://www.planetvm.net
Contributing author on VMware vSphere and Virtual Infrastructure Security: Securing ESX and the Virtual Environment
Contributing author on VCP VMware Certified Professional on VSphere 4 Study Guide: Exam VCP-410
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weinstein5
Immortal
Immortal

good point - after I posted I second guessed myself thinking you might have heard something -

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Texiwill
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Leadership

Hello,

I create a local VMFS for DR/BC reasons. If the SAN goes down, my local VMFS has a copy of my most important VMs. This way I can launch them and not loose functionality as the SAN is repaired.


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.

CIO Virtualization Blog: http://www.cio.com/blog/index/topic/168354

As well as the Virtualization Wiki at http://www.astroarch.com/wiki/index.php/Virtualization

--
Edward L. Haletky
vExpert XIII: 2009-2021,
VMTN Community Moderator
vSphere Upgrade Saga: https://www.astroarch.com/blogs
GitHub Repo: https://github.com/Texiwill
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