Hi,

I recently built a new DPM 2012 SP1 roll-up 1v2 server. Initial it was as a test and it had a 1TB of storage assigned to it for disk based backups. I have now moved the DPM server into a production role and needed additional backup storage space so i have increased the storage to 4TB.

Windows has recognized the increase in storage and shows the additional 3TB of space available in disk manager as per the screenshot below.

DPM however recognizes the increased storage but doesn't recognize that there is 3TB of free capacity as per the screenshot below.

I have performed a rescan of the disks and a reboot of the server but so far it has not changed the unallocated space.

I have had a look at the various DPM PowerShell commands but I cant see anything along the lines of rescan for unallocated space.

Any help would be appreciated.

Thanks

Jeremy

• Edited by Jeremy Chivers Thursday, May 02, 2013 1:45 PM included screenshots which were removed on 1st post.

Thank you for the response but due to time constraints I removed the additional 3TB from the iSCSI LUN and created a new one. I then updated DPM and all is working. If I have time in the future I will investigate again.

• Marked as answer by Mike JacquetMicrosoft employee, Moderator Wednesday, June 26, 2013 4:32 AM

hi, im reopening the thread as I have the same problem.

my original iSCSI target (on a storage lun) had 1 TB, and it was full

then i bought another 1 TB hard disk and ive resized the iscsi on my IBM storage to 2 TB

windows disk management correctly shows a 2TB iscsi target, and also does DPM, but it still appears as 99% full, and in disk managemnt I can see the newly 1 TB space as unallocated.

it seems DPM only "see" the iscsi size, but does not see the 1 TB unallocated space.

any considerations?

It seems the issue still there with DPM 2012 R2...

DPM powershell command don't show the unallocated space,

Diskpart is not showing it either,

Only disk manager show it in a separate "box", like if we extend a partition on a dynamic disk and because there is another partition in the middle, Windows send the "expension" at the end of the disk...

Any other solution?

I just realized that the Disk Manager has two instances openned,

After closing the one that shows me two separate unallocated space boxes,

I have refreshed the other one and everything take its place like it should...

Let's finish this DPM deployment! :-)

Hello Mike. I have the same issue after expanded my LUN on 500 Gb. I using a DPM 2012 R2. In my case i have:

Output command:

Any help will be greatly appreciated.

Best regards, Sergey.

Hi Vern1K

The problem is that disk-1 is an MBR disk (not GPT) and MBR disks have a maximum usable space limit of 2TB.  You have exceeded that size by extending that disk.  Windows cannot address more than 2TB on an MBR disks, so DPM cannot use it either.   You cannot convert a MBR disk to GPT unless it's all free space, so you can only try to remove the extra disk space from that disk and if possible add it to disk-3.

Thank's Mike. It's my mistake. I really forgot about this.