January 14, 20224 yr If your array has dual parity bits, and you follow the https://wiki.unraid.net/Shrink_array guide to remove a single data disk, will the second parity disk continue to provide protection during the rebuild operation? If so, are you any more vulnerable to power outages during this window? Thanks.
January 14, 20224 yr Community Expert Not quite sure what you are asking.? If you are talking about the first option then BOTH parity disks need rebuilding so you are not protected again until that completes.
January 14, 20224 yr Community Expert If you mean the "Remove Drives Then Rebuild Parity" Method no, both parity drives will need to be re-sync, array is unprotected until it's finished. Power outage during a rebuild is usually fine, though there could always be some filesystem corruption, to avoid that you can do it in maintenance mode, will still need to start over if the power fails for no risk of fs corruption.
January 14, 20224 yr Author I think I miss read something there the first time around (prepping to switch to unRAID from LizardFS). What I was hoping for was a way to remove a disk while maintaining parity. I think the clean drive and remove thing would do this. Sorry for burning time.
January 14, 20224 yr 44 minutes ago, BloodBlight said: What I was hoping for was a way to remove a disk while maintaining parity. I think the clean drive and remove thing would do this. It will, but for reasons unknown to me the process of writing zeroes to a disk in the array takes ages. On the order of probably 10x or more the time required to just rebuild parity. Because the situations where the advantages of clearing a drive to remove it are extremely limited, no effort has been put into figuring it out AFAIK.
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