Hello,

I have a Windows 8.1 computer with three hard drives.  The C: drive is the boot drive, and one internal 2 TB and one external 3 TB.  I'm currently running the latter two drives in a Storage Spaces mirrored configuration, which wastes the additional 1 TB.  If I add one more external USB 3.0 drive which is 4 TB, can I reconfigure the Storage Spaces to be a parity pool with all three?  Or would I have to mirror the 3 TB to the 4 TB and lose the 2 TB?  What would you suggest is the optimal configuration to set up, get a 5 TB drive and mirror between them?

Also, is there a way to boot from a Storage Spaces pool?  Or does the C: drive have to be NTFS and not be part of Storage Spaces?

Thanks for your help.

• Edited by CornellSeneschal Wednesday, March 18, 2015 4:31 PM

Hello CornellSeneschal,

You cant boot from the storage space.
For more information, please take a look at the following blog.
http://blogs.msdn.com/b/b8/archive/2012/01/05/virtualizing-storage-for-scale-resiliency-and-efficiency.aspx

Based on my test, I create three VHD. Their spaces are 4GB, 5GB and 6GB.
Please take a look at the following screenshot.

You can manually change the size, but it will increase the including resiliency.

Best regards,
Fangzhou CHEN

Thanks FangZhou.

Is there a way to convert it from Two-way mirror to Parity?  

And add a new drive as part of a Parity pool?

E.g. in your example if I have 4 GB, 5 GB, 6 GB, what is the Available Pool Capacity if it is configured as Parity resilience instead of Two-way mirror?