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Because scrubbing and resilvering are I/O-intensive operations, ZFS only allows one at a time.
If a scrub is already in progress, the "zpool scrub" command terminates it and starts a new scrub.
Maybe this is stupid but unless potentially disastrous it would make sense to me to scrub both my pools at the same time.
If the reason is not technical but only about system load and performance, is there any way of forcing two simultaneous scrubs?