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LUSE on VMWare ESX

avamar11
Frequent Advisor

LUSE on VMWare ESX

Hi ,
Due to space constraints ,we created a LUSE of 3 LUNS (20 GB each from different Parity Group ) and presented it VMware server 3.5 Now VMware sees it as 3 different disk each of 20 GB .
Can anyone help ?

Thanks in advance ...
5 REPLIES
Uwe Zessin
Honored Contributor

Re: LUSE on VMWare ESX

You can combine them into one datastore by using extents (it is not RAID-0 but concatination).
Create a VMFS datastor on the first disk. Select this datastore's properties and a new windows should pop up. There is a button which allows you to [add extent].
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avamar11
Frequent Advisor

Re: LUSE on VMWare ESX

thanks ...it can resolve the issue .but i would like to know why LUSE is showing as 3 different disk ?
Uwe Zessin
Honored Contributor

Re: LUSE on VMWare ESX

Maybe we use different terminology, but 3 LUNs make up 3 visible disks to me. You don't say what storage array is involved, but some boxes allow the concatination to happen _inside_ the array and present it as one external LUN/disk. I think EMC calls this a 'meta-LUN'.
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krusty
Honored Contributor

Re: LUSE on VMWare ESX

A LUSE is a combination of 2 or more LDEVs (that's what the XP calls the "chucks of space" inside the array) as one LUN. It is most commonly used for Windows environments.

I do not know how the VMWare kernel can "see inside the LUN" and see there are three LDEVs. When you present the LUSE, you give it a LUN # (probably "0" since you only have one LUN) so I don't know if you did it correctly. If you present the three LDEVs as three LUNs (0,1,2) then it is not a LUSE.

Could you verify that is the case?

Cheers,

Curt
"In Vino Veritas"
Peter Mattei
Honored Contributor

Re: LUSE on VMWare ESX

You must have set up individual LUNs and did not include the LDEVs properly in a LUSE.
A LUSE is always seen as one LUN only!

Dont forget to set the host mode to 21 - VMware Extension.

See the LUN Manager Guide on http://bizsupport2.austin.hp.com/bc/docs/support/SupportManual/c01956284/c01956284.pdf


Cheers
XP-Pete
I love storage