VMware Communities: In the software vSphere4.0 ,the vmfs lun or RDM lun can be larger

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6 Replies Last post: Jul 27, 2009 1:41 AM by TimPhillips

In the software vSphere4.0 ,the vmfs lun or RDM lun can be larger than 2T?

Jul 4, 2009 4:39 AM

dragooner 11 posts since
Mar 4, 2009

Hello:

AMM, I am just an Engineers,and do some test work about the vmware VI3 or VI4 software.Now, I have a customer who has an application needs a 4T space.

But, in my Laboratory I do not have such large storage. So is there any body or any good guys have all ready yet done the test which is about the lun large than 2T in the new software vSphere4? Please just tell me the results.

Or there some body could give the step by step configuration,it will be much useful.

I have looked for the topic about these things in the community, some one say could,some one say the 2T limited is still. Can some body give me an exact answer.

Tags: esx3.5, lun, luns, storage, vmdk, vmfs

Reply Re: In the software vSphere4.0 ,the vmfs lun or RDM lun can be larger than 2T? Jul 4, 2009 5:18 AM

Anton V Zhbankov 2,714 posts since
May 26, 2008

vSphere still has limitation of 2TB
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Reply Re: In the software vSphere4.0 ,the vmfs lun or RDM lun can be larger than 2T? Jul 4, 2009 7:40 AM

VMmatty 410 posts since
Oct 17, 2008

If you need to exceed the 2 terabyte limit of a VMFS partition, you'll need to present the LUN inside the virtual machine. If you have an iSCSI SAN, it is easy to do this by simply using the software initiator inside the guest to present the larger LUN.

Unfortunately an RDM won't work either as that has the same 2TB limit as a VMFS partition.

Reply Re: In the software vSphere4.0 ,the vmfs lun or RDM lun can be larger than 2T? Jul 4, 2009 1:28 PM

Altix 111 posts since
Jul 19, 2008

The exact answer would be "the limit is 2TB-512bytes".

Regards
Joerg

'Remember if you found this or others answers helpful do not forget to award points by marking an answer as helpful or correct'

Reply Re: In the software vSphere4.0 ,the vmfs lun or RDM lun can be larger than 2T? Jul 6, 2009 1:09 PM

in response to: Altix

Texiwill 10,056 posts since
Jan 13, 2004 Moderator

Hello,

Moved to ESX 4 forum.

Joerg has the correct answer. THe extra 512bytes used by vSphere has already caused some issues with migrations so if you are going to migrate you need to ensure the RDM/VMFS is properly sized.

Best regards,
Edward L. Haletky VMware Communities User Moderator, VMware vExpert 2009, Virtualization Practice Analyst
Now Available: 'VMware vSphere(TM) and Virtual Infrastructure Security: Securing the Virtual Environment'
Also available 'VMWare ESX Server in the Enterprise'
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Reply Re: In the software vSphere4.0 ,the vmfs lun or RDM lun can be larger than 2T? Jul 26, 2009 11:24 PM

in response to: Texiwill

dragooner 11 posts since
Mar 4, 2009

Oh.Thank you guys.All of you are such good man.I am very happy to receive your suggestion.

Some guys said right,it still have the limited in vSphere4.But we can use some methods to make a lun bigger than 2T.

Just do it ike the pictures in the attachments.

U will see an error 1-6,that's just because I click the mouse too quickly.:)

Attachments:

vmware-4-bigger than 2TB.rar (464.3 K)

Reply Re: In the software vSphere4.0 ,the vmfs lun or RDM lun can be larger than 2T? Jul 27, 2009 1:41 AM

in response to: dragooner

TimPhillips 118 posts since
Jul 17, 2009

If you are using iSCSI I recommend you to take a Starwind target for it. I use for myself for long time already, and it`s very robust, according to my lab test. The only limit of free version it`s 2 Tb limit, what can be a trouble in your case, but I would recommend it to ypu anyway.

Tim.

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