October 16, 200817 yr This isn't clearly spelled out anywhere that I could find. Say I have 7x500gb drives. Would a 501gb drive be enough for parity if it existed?
October 16, 200817 yr It has to be as big (or bigger) than the largest data disk. With all 500G data drives, a 500G parity is perfect.
October 16, 200817 yr I was surprised you'd have trouble locating this very basic piece of information about unRAID, but when I looked I did not immediately find it either. Here is a description of how parity works in unRAID. It will help you understand why the drive doesn't have to be any larger than the largest drive. There have been a few reports of certain motherboards / disk controllers "hiding" a very small amount of space on a disk drive. This can result in, for example, 2 500G drives being of slightly different sizes. Although this is pretty rare, it has caused some users consternation as unRAID will not accept a parity drive smaller than the largest data drive, even if the size difference is tiny (even 1 sector would be too much).
October 16, 200817 yr Author I have problems like that with raid controllers in the past.. They should all round the drive sizes down a little to some acceptable figure..
October 16, 200817 yr I have problems like that with raid controllers in the past.. They should all round the drive sizes down a little to some acceptable figure.. The Areca's have a configurable option to do this.
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