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Raid 5 Troubles

ccros44
By ccros44
in Storage Devices
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So i recently lost a hard drive that was not backed up which was motivation for me to put my other 3 and the replacement 4th drive into a raid 5. i have a 3tb drive 2x 2tb drives and 1 tb drive all diffrent brands and all 7200rpm sata 3. i know that you SHOULD have all the same drive size and a proper raid card instead of just using the raid controller on your mobo but i dont really have the money to replace perfectly good hard drives with others and go out and buy a raid card. the raid itself works fine but i am only getting 2.7tb. i thought it would use a 3tb, 2tb and a 1tb for the data then a 2tb for the equation = 6tb usable. i thought this way because raid 5 is ment to take 1 quarter of the available space and use it for the backup equation making 8tb into 6tb with a 2tb equation. any help or suggestion to how im wrong

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When doing hardware based raid, on your mobo, it also makes the array using the size of the smallest drive - as they all need to match. So you essentially have and array of 4 x 1TB in RAID5 - which means you lose "one" to parity leaving a theoritical max of 3TB usable. Overhead, MBR, and such and voila - 2.7TB usable. You will need to upgrade your drives to get more space.

Something that "would" combing and use all the drives and give you more space woudl be Windows 8 / Server 2012 Storage Spaces...

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When doing hardware based raid, on your mobo, it also makes the array using the size of the smallest drive - as they all need to match. So you essentially have and array of 4 x 1TB in RAID5 - which means you lose "one" to parity leaving a theoritical max of 3TB usable. Overhead, MBR, and such and voila - 2.7TB usable. You will need to upgrade your drives to get more space.

Something that "would" combing and use all the drives and give you more space woudl be Windows 8 / Server 2012 Storage Spaces...

thanks for your help. i understand now

<a href="http://imgur.com/8FONbK8" title="My Adventures In KSP"><img src="http://i.imgur.com/8FONbK8.png" title="Hosted by imgur.com" alt="My Adventures In KSP"/></a>

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When doing hardware based raid, on your mobo, it also makes the array using the size of the smallest drive - as they all need to match. So you essentially have and array of 4 x 1TB in RAID5 - which means you lose "one" to parity leaving a theoritical max of 3TB usable. Overhead, MBR, and such and voila - 2.7TB usable. You will need to upgrade your drives to get more space.

Something that "would" combing and use all the drives and give you more space woudl be Windows 8 / Server 2012 Storage Spaces...

No problem - glad it all sorted out. :)

Forum Links - Community Standards, Privacy Policy, FAQ, Features Suggestions, Bug and Issues.

Folding/Boinc Info - Check out the Folding and Boinc Section, read the Folding Install thread and the Folding FAQ. Info on Boinc is here. Don't forget to join team 223518. Check out other users Folding Rigs for ideas. Don't forget to follow the @LTTCompute for updates and other random posts about the various teams.

Spoiler

Whaler_99 Links - "Green Machine" (watercooled), "Out of the Blue" (watercooled), My 4P Folding rigs, My multi GPU Folding Rigs, The Water Cooling FAQ, My 40TB Storage Server, My Folding Stats. The CM HAF XB review, the Aqualis Pro 450 review, the PrimoChill CTR Phase II Res review, the IcyDock ToughArmor 6x1 review, the 3x2 Storage Cage review, the 5x3 Storage Cage review, my Milwaukee Jobsite Backpack review, my Thermaltake Core X2 review, my CoolerMaster Storm Stryker overview. Link to DA Blogs home.

Follow me on Twitter for updates @Whaler_99

 

 

 

 

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