ESXI Server not able to add files to the NFS Share

I am plaqued with this problem of trying to resolve this corporate level implementation of using our existing several terabytes of storage as local storage on our ESXI host.  I have no trouble mouting the NFS Storage, permissions have been set. All of the visible and logical network pieces are in place. Have set up as indicated in several forum. Created a VM Kernel as they connection type, created a Virtual Switch, labeled the NFS Storage. Their are no firewall existing that can be seen. Can ping in both directions.  But when it comes down to Trying to upload a file or create a directory on the NFS Storage, i get an I/O error occured.  The NFS Storage is on a Windows Server 2008 Server and ESXI host is ESXI 4.1.  
cgooden01Asked:
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
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cgooden01Author Commented:
I have look over the video tutorials and I have to say they are very good., but just not giving me the answers to the solution i need.  I have all of this in place.  What i have is a HP Blade running my Windows 2008 Server that is being used for the NFS, the only role it is used as is a File Server.  I seen in a few instructional videos, that it can be that it need to be a DC, but that makes no sense at all.  That's the whole purpose of it solely acting in the capacity as a NFS Share/File Server.  

When i set this up from VM Ware ESX 4.x and another virtual machine with an NFS share, it works just fine.  The problem is when i try to add a physical server with up to 8 TB, I get an  i\o error.  The NFS Mounts but cannot add or remove from the storage, and when i create a folder, it allows me to do this but not any file with any amount of size...????  I am at lost here...
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Just once quick question is this Windows 2008 or Windows 2008 R2?

There is a big difference to how to setup NFS?
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cgooden01Author Commented:
It is Windows 2008...
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cgooden01Author Commented:
We dont have an authorized Windows 2008 R2 baseline..even though i would recommend it myself...I have to use Server 2008 for now ...until we get the upgrade authorization
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
okay if using Windows 2008 you either need to use

1. user mapping service on a 2003 server

or

2. user mapping with Active Directory,

otherwise NFS permissions will not be correct.
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cgooden01Author Commented:
User Mapping with Active Directory...

Can you explain this with more detail or an online article...proposing this method
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cgooden01Author Commented:
And are you saying that Having Server 2008 R2 will resolve this issue
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
R2 is easier to setup, because there is no longer a requirement to use a user mapping service as per videos.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
User Mapping, you need to map the root user on the ESXi server, with an equivalent AD user.

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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
the pdf here walksthrough user mapping, active directory

http://xtravirt.com/nfs-storage-configuration-for-vsphere-using-windows-2008

you need to create a login to get access to pdf.

I do not know why 2003, 2003 r2, nfs fairly straightforward, 2008 became a nightmate, and then 2008 r2, they invented a tick box, and it becomes simple!
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cgooden01Author Commented:
Okay..let me experiment with this and let you know the results.  Would like to reward you the point with your assistance at the same time....resolve this long outstanding issue.  Thank You
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cgooden01Author Commented:
One more question..If I have the permission set to anonymous for everyone read+write, would i see need to set up a specific AD user against the ESXI..?
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
yes, Local Administrator or Domain Admin = root.
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cgooden01Author Commented:
Sorry was out of my work location for awhile.  In fact it was a permission issue that was required to be annotated and granted via NFSadmin command lines. I was able mount the storage and worked like a charm, but not as efficient as i would like because of the high numbers of read/write latency.  Still trying to tweak this now.
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cgooden01Author Commented:
Solutions has been completed and answered, appreciate the assistance granted.  Worked perfectly after some tweaks...
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cgooden01Author Commented:
Solutions were party substantial in the case of resolving all issues, pointed me in the right direction in which i was able to use NFSadmin command line and also get more granular with permissions.
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