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I would like to see your zpool status when the array goes way.
A pool scrub checks all pool data for consistency and it does not consider whether
the devices just went offline recently.
In my experience, the pool is DEGRADED until the devices come back. Do you clear the pool
errors with zpool clear to try to resolve the DEGRADED state? You can also run zpool clear on
the individual devices.
If you have tried to clear the DEGRADED pool state with zpool clear and must resort to
a pool scrub, then I would be concerned about how long the array goes away.
I would review what FMA says about these device faults or errors and based on that
output, figure out how to keep the arrays from going offline.
# fmadm faulty
# fmadm -eV