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Problem extending dynamic GPT volume in Windows 2003 Server

Last Modified: 2013-11-14
Here is a breakdown of the hardware and software involved.

Windows 2003 Server R2 w/ SP2
Dell PowerEdge 1950
Dual Socket dual core 3Ghz processors
Dual Onboard Broadcom NICs

EMC Clariion SAN
2 DAE's with 30 750 GB drives

Server is connected via iSCSI to the SAN and this is my first iSCSI experience.

I configured a MetaLUN in Navisphere and assigned 100% of the LUN the a Storage Group called "File Server Storage". I then assigned the server to that storage group and was able to see the new storage.

The original size of the MetaLUN was approx 15TB  RAW and consisted of 5 RAID 5 LUNs that included 5 750 GB drives each. After creating this MetaLUN 5 disks reamained unused. (relevant later).

I registered the Storage Processors as Target Portals in the MS iSCSI innitiator and created a persistant connection to the now seen iSCSI targets.  I then refreshed Device Manager and had LDM rescan the BUS to discover the new storage. I converted the storage to a dynamic GPT volume and formatted it using NTFS and gave it the drive letter "E".

Once the storage was usable I made it persistant and tested data transfer with no issues.

I was confident the storage and began my data migration from tape backup. I was moving nearly 5 TB of data from an older XRAID and this process took almost a week.

Once the migration was done. I decided to extend the volume. This is a 2 step process. First off I created another 3TB LUN and then extended the MetaLUN to include the new LUN. Once that was done I refreshed LDM and saw the new unused storage space.

I then used diskpart.exe to extend the volume. This finished with no errors and said that the volume had been exteneded successfully. I refreshed LDM and in the bottom view it showed the correct size of 16+TB. Though when I looked at the volume properties above it still showed the original size of 13+TB.

I researched this issue and found this MS office which seems right on.


I followed the articles instructions and used the "extend filesystem" command to further extend the volume. After issuing the command I get a successful return but no change is made.

At this point I have a volume that shows correctly in LDM but incorrectly when disk properties are returned in My Computer or other Explorer views.

Any ideas or help would be greatly appreciated.


Watch Question

Did you do the following while using diskpart:
1. From a command prompt window type diskpart
2. Then type the following: select disk <disk number of drive letter E>
3. Then type: extend

Once you do that go back into Disk Management and rescan the BUS. You should see 16+TB.

One note though. It seems like you used a concatenated MetaLUN which is not good for performance reasons. I understand that a striped MetaLUN probably wouldn't work in your case since that would mean that you would need another LUN which has to be exactly the same size as your original LUN (13TB). Just something to keep in mind.

Sorry, step 2 should be select volume. First type list volumes and then select volume <volume number>.


thanks for the response etaljic.

I had already done what you mentioned above.

It is not concatenated but striped. Navisphere will allow expansion of striped metaLuns.

I determined that the issue was iSCSI with a dynamic volume, something MS frowns upon. I destroyed the volume and recreated as a basic GPT volume. All seems well now.

Thanks for your help.
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Yep. I was aware. I built the metaLUN on 3TB RAID 5 (4x1) LUNs, as it seemed the most practicle use of space and was an equal divider into the DAE.  Thanks again for the help. I will credit you with the points since you responded.

Best REgards,

Thank you Alex.
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