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Message-ID: <24815d81-2e4f-4ddf-b194-b03ea3232b91@youngman.org.uk> Date: Tue, 3 Jun 2025 17:46:01 +0100 From: Wol <antlists@...ngman.org.uk> To: David Niklas <simd@...mail.net>, Linux RAID <linux-raid@...r.kernel.org> Cc: linux-kernel@...r.kernel.org Subject: Re: Need help increasing raid scan efficiency. On 03/06/2025 02:05, David Niklas wrote: > So I setup the array into read-only mode and started the array with only > two of the drives. Drives 0 and 1. Then I proceeded to try and start a > second pair, drives 2 and 3, so that I could scan them simultaneously. > With the intent of then switching it over to 0 and 2 and 1 and 3, then 0 > and 3 and 1 and 2. BACKUP! BACKUP!! BACKUP!!! Is your array that messed up that it won't assemble? If you can just get it to assemble normally that's your best bet by far. Trying to assemble it as two pairs is throwing away the whole point of a raid 6! And make sure you know the order of the drives in the array! I hope you haven't lost that infof. If your event counts are all similar, then you'll hopefully recover most of your data. Your biggest worry will be the mobo and ram having trashing an in-flight write that corrupts the disk. Then once you've got the array assembled, I can't remember the command, but there is a command that will read the entire stripe, check the paritIES - both of them, and recreate the data. If that fails, your data is probably toast, and nothing you can do will be able to retrieve much :-( Cheers, Wol
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