A raid6 array with a spare and bitmap is idle: not mounted and with no
IO to it or any of its disks (obviously), as shown by iostat. However
it's consuming cpu: since reboot it used about 11min in 24h, which is quite
a lot even for a busy array (the cpus are fast). The array was cleanly
shutdown so there's been no reconstruction/check or anything else.
How can this be? Kernel is 2.6.22.16 with the two patches for the
deadlock ("[PATCH 004 of 4] md: Fix an occasional deadlock in raid5 -
FIX") and the previous one.
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