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rickr1

2 Posts

644

February 25th, 2009 07:00

Create stub LUN for MS Win - what size?

I already have many stub LUNs created for the Windows environment for the purpose of "mounting" other LUNS as storage available to Windows.
Most of these LUNs were created as 1GB by someone unknown to me.
Is this 1GB size necessary (that is, could I make my next stub LUN smaller to conserve space), or optimal or have other considerations?
I am using Clariion storage on this project, and (obviously) a Windows server 2003 environment.

dynamox

1 Rookie

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20.4K Posts

February 26th, 2009 07:00

root volume needs to be a couple of megabytes, that's all you need according to Micro$oft.

http://support.microsoft.com/kb/280297

I see you creating a few "stub" luns to create some sort of logical separation and maybe give Windows more IO queue to drive its request through but from capacity perspective i would create them as small as you can.

dynamox

1 Rookie

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20.4K Posts

February 25th, 2009 14:00

what do you mean by stub LUN. Can you describe your project and what you are trying to do ?

Btw ..Welcome to EMC Forums :)

thanks

dynamox

1 Rookie

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20.4K Posts

February 25th, 2009 14:00

100 megabytes ? :) ..since you are mounting under sub directories it should not matter.

xe2sdc

2.8K Posts

February 25th, 2009 14:00

With recent M$ OS you can "mount" a device on a mountpoint (just like you already do with any unix). But you need a device (\\.\physicaldrive2 mounted as X: ) that contain directories (X:\home1 X:\home2 X:\private ...)
You later mount \\.\physicaldrive3 on X:\home1, \\.\physicaldrive4 on X:\home2 ..

Now the question is .. how big is X: (\\.\physicaldrive2) ??

xe2sdc

2.8K Posts

February 26th, 2009 00:00

I don't really know .. that's why I'm not giving directions ;-)

rickr1

2 Posts

February 26th, 2009 06:00

Ok, let's say 100 megabytes stub. Have you used this number successfully?
We have up to 6 or 8 LUNS mounted on a stub LUN (four were 1TB each), but for my new application I will have 3. Two of the LUNS will be 1TB, and the third about 800GB.
Using 1 GB, as previously done, seemed wasteful of storage space. But I am unsure of what the stub LUN does, other than what we know - use a drive letter and allow the other LUNS to be "mounted" as a folder under the drive letter. We don't plan on putting any files at the drive root, so file space is not an issue. I just don't want to make a small LUN and map it to a drive, but find out later that it's not big enough when I attach the real LUNs
(BTW, Is this Microsft's answer to a problem of only having 21 possible "drives" available to attach storage?)

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