Nano Posted September 4, 2020 Share Posted September 4, 2020 Hi All, If i currently have 4TB Parity + 4TB Array +4TB Array 8TB Total If i have an additional 4TB Drive, what are negatives of adding to the array vs the duel Parity. If i add it to Parity i only have 8TB Usable space right? If i add it to the array i have 12TB. but if more than one disk fails i lose the whole array correct? Aslong as i have a backup, what would you guys do? Quote Link to comment
JonathanM Posted September 4, 2020 Share Posted September 4, 2020 1 minute ago, Nano said: but if more than one disk fails i lose the whole array correct? No. You lose whatever is on the failed disks. Quote Link to comment
Nano Posted September 4, 2020 Author Share Posted September 4, 2020 Just now, jonathanm said: No. You lose whatever is on the failed disks. Ah true, If i have 1 parity drive and only 1 array drive fails it will rebuild. What would you do, extra parity or extra Data drive. Quote Link to comment
S80_UK Posted September 4, 2020 Share Posted September 4, 2020 (edited) @jonathanm is correct. With a single parity drive, then if more than one disk fails you lose the data on those disks, so with one parity and three data disks if two disks fail then you would lose one or two data disks depending on whether the parity disk was one of those that failed or not. So long as you have a reliable backup, then I would go with extending the array in this case. Edited September 4, 2020 by S80_UK Quote Link to comment
ChatNoir Posted September 4, 2020 Share Posted September 4, 2020 It is generally advised to only add drives as needed since each drive is a potential point of failure. How much data do you think you will need on the short term ? Quote Link to comment
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