Solved

Unable to see unallocated disk space on Dell PE 2850

Posted on 2013-01-28
6
863 Views
Last Modified: 2016-11-23
Hi all,

I have a Dell PE 2850 with 3 disks as Raid 5 (has OS) and a pair as raid 1. I have recently upgraded the disks to the next size up, and the have reconfigured themselves at the former size as expected. I was then expecting to be able to use Windows Disk Management to extend the partition (there's only one on each of the two sets of disks). However, disk management does not see the additional space - a right click on disk management and selecting rescan, does not change anything.

The Dell OpemManage can see the free space on each virtual disk. Selecting reconfigure from there does not allow me to extend them. - I can create a new Raid 0 on the free space.

Using the DELL extpart, it errors saying unable to retrieve the partition information. Dispart similarly fails. All disks in each array are of the same size and double the size of their presecessors (now 3 x 73 Gb in Raid 5) and 2 x 146 Gb in Raid 1. Both  Arrays are still showing around 68Gb as maximum size.

How can I extend these to use the full available space?
0
Comment
Question by:Kelvin Sparks
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
6 Comments
 
LVL 88

Accepted Solution

by:
rindi earned 300 total points
ID: 38829986
Backup the OS, delete the current array, build a new array with the new disks, then restore the OS from your backup. If the backup utility doesn't allow direct resizing on restore you can do that later within diskmanagement (I don't think 2008 server's built-in backup tool can resize the partition when restoring).
0
 
LVL 22

Author Comment

by:Kelvin Sparks
ID: 38829997
Whilst I have full backups, I don't really want to go to that extend. If I can extend with disk management after a backup, why can't I do that now?

Kelvin
0
 
LVL 58

Assisted Solution

by:Cliff Galiher
Cliff Galiher earned 50 total points
ID: 38830003
Because right now the OS does not have access to the extra space. That is why rindi's response included the all-important step of deleting and creating a new array. The barrier you've hit is a limitation of the RAID controller, not the OS. You must build a new array using the available space before the OS can have access to it.
0
What does it mean to be "Always On"?

Is your cloud always on? With an Always On cloud you won't have to worry about downtime for maintenance or software application code updates, ensuring that your bottom line isn't affected.

 
LVL 88

Expert Comment

by:rindi
ID: 38830007
Because the array controller you are probably doesn't have the capability to expand the arrays. Even if it does have the capability this doesn't always work properly.
0
 
LVL 33

Assisted Solution

by:PowerEdgeTech
PowerEdgeTech earned 150 total points
ID: 38830013
Disk Management has nothing to do with the RAID arrays, and partitions and arrays are not the same thing.

Having replaced the disks one at at time, the only option you have is to create a second RAID array across the disks, as this method is not one supported by this RAID controllers (and many others) as a way to expand the array.  Say you have two 73GB in a RAID 1 and you replace the disks with 146GB disks.  You can only create a second 73GB RAID 1 across the disks.  This will show in the OS as a separate "disk" in Disk Management, so it cannot be combined/merged with existing partitions.  

If you MUST have all your disk space as a single unit/disk, then backup, delete array, create new/larger array, restore.
0
 
LVL 22

Author Closing Comment

by:Kelvin Sparks
ID: 38830080
OK Thanks. While it isn't the solution I wanted, I accept what is said.

Kelvin
0

Featured Post

VIDEO: THE CONCERTO CLOUD FOR HEALTHCARE

Modern healthcare requires a modern cloud. View this brief video to understand how the Concerto Cloud for Healthcare can help your organization.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Possible fixes for Windows 7 and Windows Server 2008 updating problem. Solutions mentioned are from Microsoft themselves. I started a case with them from our Microsoft Silver Partner option to open a case and get direct support from Microsoft. If s…
Restoring deleted objects in Active Directory has been a standard feature in Active Directory for many years, yet some admins may not know what is available.
This tutorial will walk an individual through locating and launching the BEUtility application to properly change the service account username and\or password in situation where it may be necessary or where the password has been inadvertently change…
This tutorial will walk an individual through the steps necessary to join and promote the first Windows Server 2012 domain controller into an Active Directory environment running on Windows Server 2008. Determine the location of the FSMO roles by lo…
Suggested Courses

627 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question