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Re:ZFS raidz expansion is coming by Just1689 on Monday August 07, 2023 @03:31PM (#37039716)
Could it be related to the following?

> After the expansion completes, old blocks remain with their old data-to-parity ratio (e.g. 5-wide RAIDZ2, has 3 data to 2 parity), but distributed among the larger set of disks. New blocks will be written with the new data-to-parity

Re:ZFS raidz expansion is coming by bombcar on Monday August 07, 2023 @03:37PM (#37039789)
Sounds like it, but I wonder if they'll be able to add a "final pass rewrite" that would scrub it clean.