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Server 2012 Storage Spaces Parity - not calculating correctly?

Answered Server 2012 Storage Spaces Parity - not calculating correctly?

  • Saturday, January 12, 2013 10:49 PM
     
     
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    I created a Volume using 4x 2TB HDDs. The HDDs are 1.81TB formatted. When I put all 4 in a Volume, they show total 7.82TB - but then if I create a Storage Space with all of the drives the size is only 4.83TB. I would have expected the Parity to be RAID5 - which should yield 5.43TB. So what is happening with the drive space? What type of parity is being used?
     

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  • Sunday, January 13, 2013 4:50 AM
     
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    You are using the GUI. The GUI uses a ratio of 1:3 column space, so there is one parity stripe for every two data stripes. There is no way to control the column space from the GUI, so use Powershell to make your parity space have 4 columns. Then you will have one parity stripe for every three data stripes, so you will have 5.4 TB. Also note that if you have 4x2TB drives it should give you a total space of 7.2 TB not 7.8 TB , yes?
     
  • Sunday, January 13, 2013 2:25 PM
     
     
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    Thanks for the answer! Now I can fully utilize my storage! Yes - I meant 7.28GB - not 7.82GB. I don't understand why there are so many gui/powershell mis-alignments.