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2 Parity drives enough?

physikal
in General Support

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I have a 24 bay Supermicro box running unRAID.  I have 2x 6TB Parity drives, 6x 6TB and 8x 4TB drives....with 8 more bays available....are 2x 6TB parity drives really going to cover a failure? 

Edited by physikal

  • Quote



    I have a 24 bay Supermicro box running unRAID.  I have 2x 6TB Parity drives, 6x 6TB and 8x 4TB drives....with 8 more bays available....are 2x 6TB parity drives really going to cover a failure? 


    Key differences between unRaid and a classic raid is that if you ever exceed the number of simultaneous drive failures on classic raid you will have lost 100% of all your data. With unRaid you will only ever lose a portion.

    Additionally, with a classic raid solution a drive that takes a hair longer to respond to a read or write gets dropped from the array (TLER) and is thus a drive failure. Not so with unRaid.

    True drive failures are actually very rare
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