RAID6, adding hard drives -- Windows 2012 R2 ?

Is the below doable since someone
told me I would have to set this up
as a second partition since doing the
below would corrupt my current data ?

1. I add 4 disks to my current Dell PowerEdge
   R610 4 disk RAID6 array since it has
   8 total 2" bays, making all 8 full
2. I reconfig my RAID6 to use all 8
   disks, no 2nd partition needed
     ** I have valid backups
     ** I have Dell OpenManage
        Server Administrator
3. I reconfig my Hyper-Vs to
   autoGrow via "ThinProvisioning"
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Scott CSenior EngineerCommented:
You should be fine.  I've added drives before and had no corruption.  But of course be sure to have a full AND tested backup before you begin.

Since someone told you that you could get corruption, I'd ask them for references backing that statement up.

Here is a thread on Dell where it was done.  Nobody indicated corruption could occur.

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PowerEdgeTechIT ConsultantCommented:
I'd probably just ignore that Spiceworks thread. It is largely irrelevant to your question, too full of argument and too light on details of the operation in question.

Always be prepared, but Online Capacity Expansion allows you to expand your 4-disk RAID 6 to an 8-disk RAID 6 BY DESIGN.

This can all be done in OMSA, under Virtual Disks ... just choose Reconfigure from the dropdown menu of Available Tasks for your RAID 6.

1) Make sure your drives are first showing in Physical Disks as READY (if Foreign, you need to first clear the foreign configuration).

2) Make sure you don't have more than one VD across the same set of RAID 6 disks. Called "slicing", you can't expand an array that contains RAID "slices".

3) Also note the drive size. Say you are using 1TB drives. 4x1TB in RAID 6 gives you 2TB of space - that is a 2TB "disk" that Windows is installed on. If you expand to 8x1TB, your RAID 6 will create a 4TB "disk". Because Windows can only use a +2TB disk if it is GPT, and it can only boot to a GPT disk if installed on a UEFI-enabled system, if you currently have your boot mode set to BIOS (not UEFI), you will not be able to use the newly added space and you'd be better off creating a second RAID 6 "disk" for Windows with your new disks.
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