shortsyoungster Posted July 4, 2017 Share Posted July 4, 2017 Hi, I am planning an unraid box, and I was wondering how much storage I would be losing in double parity. My planned storage configuration is 6 2tb hard drives, and 2 128gb SSDs for the cache. Quote Link to comment
SSD Posted July 4, 2017 Share Posted July 4, 2017 1 disk. In unRaid, each parity disk is 1 whole disk equal or greater in size than than the data disks. So if you have 6 2T drives with one parity, one (2T) would be used for parity, and 5 (10T) would be available for data. If you used dual parity, 2 (4T) woudl be used for parity, and 4 (8T) would be for data. With that few drives, unless they are old or unreliable, I'd go with single parity in that size server. Better yet, use single parity and use one of the drives for backups that you keep offsite. Quote Link to comment
tdallen Posted July 4, 2017 Share Posted July 4, 2017 Hi - i assume you are using drives you already have, but if not I would encourage you to buy larger drives. The cost per TB is lower on on 3 and 4TB drives, typically. Personally I'd go with 6 and 8 TB drives these days. 1 Quote Link to comment
shortsyoungster Posted July 5, 2017 Author Share Posted July 5, 2017 (edited) I also have a 4tb hard drive, would it be possible to add that in, or do my parity drives have to be the same size of my largest drive? And yes these are drives I already own. Edited July 5, 2017 by shortsyoungster Quote Link to comment
SSD Posted July 5, 2017 Share Posted July 5, 2017 1 hour ago, shortsyoungster said: I also have a 4tb hard drive, would it be possible to add that in, or do my parity drives have to be the same size of my largest drive? And yes these are drives I already own. Parity has to be at least as large as the largest data drive in the array. You could certainly have a 4T parity, with 2T drives. You'd be all set to add another 4T drive in the future. But until then, 2T of its capacity wouldn't be providing any value. Take a look at this video as it might help you understand how parity works. Quote Link to comment
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