lwhitlow
Contributor
Contributor

Windows Disk Size

Good morning,

I am pretty sure that the max size of a LUN that can be presented and seen by ESX\ESXi is still 2TB. What I am wondering iis if there is a way to create a disk that appears to the user as say 20TB, in Windows, spread across multiple LUNS? The user is creating a very large database with photos that take up large amounts of space and he is not wanting to have to mange the C, D, E, F, G, etc drives and would much prefer say his C and D drives. Is this possible? Thanks.

Lee Whitlow

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7 Replies
admin
Immortal
Immortal

You should check out the Storage Maximums for ESXi 5 as defined in https://www.vmware.com/pdf/vsphere5/r50/vsphere-50-configuration-maximums.pdf

I am pretty sure that the maximum size for a single given LUN being presented to an ESXi 5 host is larger than 2 TB.

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AnthonyChow
Hot Shot
Hot Shot

Check out:

http://www.vmware.com/files/pdf/techpaper/Whats-New-VMware-vSphere-50-Storage-Technical-Whitepaper.p...

Page 2 said 64TB support on a single extent and the block size has changed also.

lwhitlow
Contributor
Contributor

So if what I am reading from both of y'all, the Host can be presented with a LUN that is larger than 2TB in 5.*, say 20TB but I want to make sure that the actual VM can be presented that 20TB as a single disk and not just multiple 2TB disks. I am looking at Virtual Machine Maximums on Config Maximums and still see "Virtual disk size 2TB minus 512 bytes" so I just want to be sure. This might be a way for us to go ahead and move from 4.1 to 5 but I need this confirmed.

Appreciate the help and information.

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mittim12
Immortal
Immortal

While the LUN size has increased the virtual disk limitation remains the same so it can not be larger than the 2TB -  512 bytes

lwhitlow
Contributor
Contributor

Thats what I was afraid of. Being able to have the LUN is great but the VM needs to be able to see that storage as one drive larger than 2TB -  512 bytes. I really appreciate the help guys. That tells me what I need to know.

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cjscol
Expert
Expert

Could you not present multiple vmdks or rdms to the virtual machine and then assuming your operating system supports it create a partition/file system across the multiple disks?  Such as using Dynamic Spanned Volumes in Windows?

Calvin Scoltock VCP 2.5, 3.5, 4, 5 & 6 VCAP5-DCD VCAP5-DCA http://pelicanohintsandtips.wordpress.com/blog LinkedIn: https://www.linkedin.com/in/cscoltock
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rickardnobel
Champion
Champion

If you have ESXi 5 you could create LUNs at any size (limit 64 TB) and do one Raw Device Mapping in physical mode to the VM. It will then be able to see and use the whole large disk.

It is just when you have a VMDK based virtual disk where the 2TB-512b limit is still around.

My VMware blog: www.rickardnobel.se
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