September 13, 20187 yr Hello, I'm trying to expand an existing array I have on unraid 6.5.3 and am receiving the "Disk in parity slot is not biggest." error. I've attached my diagnostics zip to this post. My array is as follows: Parity Disk 1: 2TB WD Drive Parity Disk 2: 1TB WD Drive Data Disk 1: 1TB Samsung Drive I'm trying to replace Data Disk 1 with a 2TB Seagate drive and add the 1TB Samsung drive as Data Disk 2. I've checked the disk sizes and the 2TB and 1TB drives each match their pair, and all four drives have HPA disabled. I've tried all different combinations to solve the size issue but can't seem to resolve it. Any help would be greatly appreciated! diagnostics-20180913-1600.zip Edited September 16, 20187 yr by Pears
September 13, 20187 yr Author 1 minute ago, xman111 said: don't both parity drives need to be larger than the data drives? They can't be exact matches, at least in size?
September 13, 20187 yr I'm just guessing here but I thought your 2 2tb drives would both have to be parity drives and the 1tb drives would have to be data. someone smarter than me I'm sure will chime in.
September 14, 20187 yr 1 hour ago, Pears said: They can't be exact matches, at least in size? Yes, your data drives can be an exact match of your SMALLEST parity drive. You have a 1TB parity drive, so the largest data drive allowed is 1TB. https://wiki.unraid.net/Parity#Size
September 14, 20187 yr Author 2 minutes ago, jonathanm said: Yes, your data drives can be an exact match of your SMALLEST parity drive. You have a 1TB parity drive, so the largest data drive allowed is 1TB. https://wiki.unraid.net/Parity#Size Got it, thanks for the help! Still learning unRAID after a recent switch from freeNAS. ☺️
September 14, 20187 yr Community Expert Unless you plan to add even more drives (and I don't recommend going for more with such small drives) then you should consider just single parity of 2TB and let all the others be data.
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