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After installing Windows 2012 R2, the disk management is showing wrong storage, could this be due to Raid management

Posted on 2016-08-25
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Last Modified: 2016-12-08
I have a dell R420 server with 4, 300GB sas harddrive in it, with contos OS. I had to install windows 2012 R2 in it. I did a boot up from the CD drive and installed the Windows 2012 R2. Now when i see the disk management it is showing me 600gb of storage instead of 1200. Could this be due to preinstalled raid configuation, if yes how do i delete it and get back the complete storage space
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Question by:Avtar Singh
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rindi earned 1000 total points (awarded by participants)
ID: 41770070
You are probably using RAID 10. Normally you setup Dell servers via the OpenManage DVD that comes with the server, or if it is a newer model, it has a lifecycle controller which is together with it's iDRAC module. Check your server's manual on how it is used. With this you setup the RAID array, select the OS to install, and everything gets properly setup. But don't use RAID 5. That is an obsolete, outdated and unreliable form of RAID. Use either RAID 6, or stay with RAID 10. The capacity will be the same.
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by:David Sankovsky
ID: 41770096
If you have 4 Disks, Striping them all together would indeed give you approx 1.2 Tb this is however not recommended as in a Stripe configuration (AKA RAID 0) if one physical disk fails, the entire logical volume fails as well!
I'd suggest using RAID 5 where you have 3 active disks and one parity disk. This allows you to lose one disk without losing any of your data.

As for finding the raid configuration, rindi is correct, your server most likely has a build it RAID Controller and is most likely controlled by the lifetime manager.
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by:rindi
ID: 41770148
No, don't use RAID 5. That is something of the past decade. If you need more than 600GB space, get some additional disks and setup RAID 6.
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by:PowerEdgeTech
PowerEdgeTech earned 1000 total points (awarded by participants)
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... or larger disks.
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by:rindi
ID: 41789617
Avtar-Singh,

Feedback please.
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