BloodBlight Posted January 14, 2022 Share Posted January 14, 2022 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. Quote Link to comment
itimpi Posted January 14, 2022 Share Posted January 14, 2022 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. Quote Link to comment
JorgeB Posted January 14, 2022 Share Posted January 14, 2022 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. Quote Link to comment
BloodBlight Posted January 14, 2022 Author Share Posted January 14, 2022 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. Quote Link to comment
JonathanM Posted January 14, 2022 Share Posted January 14, 2022 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. Quote Link to comment
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