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Vmware VMDK and VMFS

Posted on 2011-02-16
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Last Modified: 2012-05-11
I would like to know if VMDK file is by partition or by LUN .
Let's say I have 250GB LUN assigned from SAN for a VMmachine, If I partition this LUN into 2 or partitions, am I going to create 2 or 3 VMDK files in the VMFS data store?

Regarding VMFS, is it by datastore or by LUN or by partition?
for instance let's say the whole SAN storage is 10TB and it s used for VM Machines and separated into Datastores, would the  datastore be  a VMFS, or just a LUN that is presented to a specific VMmachine can be vmfs?

thanks



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Question by:jskfan
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LVL 124
ID: 34905497
A vmdk is a virtual machine disk file, which is stored in a formatted vmfs (virtual machine file system) in a LUN, on the SAN.

Does that help?
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LVL 124
ID: 34905507
LUNs are formatted by VMware ESX as vmfs, so they can be used as datastores for VMware ESX. Just like you need to format a disk with NTFS (or FAT32) for Windows XP.
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LVL 124
ID: 34905516
You create a single LUN, format it with vmfs, and it's available as a datastore for all VMs.

depending on how large the LUN is, you can create small LUNs for single machines or large LUNs for multiple machines.
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Author Comment

by:jskfan
ID: 34905555
I get wrapped in the terminology .... Correct me where I am wrong.

Datastore= the SAN diskspace that has been carved from the Whole SAN storage and can be sliced into LUNs. Correct?
LUN= the SAN disk space assigned or allocated to a specific VM machine. Correct?
VMFS= the format of the Datastore. Correct?
VMDK= the file that represent the whole VM machines such disk partitions, configurations of memory,CPU, etc... Correct?

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by:Andrew Hancock (VMware vExpert / EE MVE^2)
Andrew Hancock (VMware vExpert / EE MVE^2) earned 2000 total points
ID: 34905619
vmdk - yes, you've got that correct.

vmfs - yes, you've got that correct.

LUN - allocated to the host ESX server, it can store single or multiple VMs.

datastore = formatted vmfs LUN

datastore can store single or many VMs.
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Author Comment

by:jskfan
ID: 34905703
can Datastore  have many LUNs ?
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Accepted Solution

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Andrew Hancock (VMware vExpert / EE MVE^2) earned 2000 total points
ID: 34905722
well yes and no. but normally, a datastore sits on one LUN, but if you run out of space, you can grow it, or add Extents. (but not recommended)

you could span a datastore across many LUNs, this is called Extents.
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Author Closing Comment

by:jskfan
ID: 34905759
Thanks a lot
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