On Sunday January 20, carlos@xxxxxxxxxxxxxx wrote:
> 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.
Maybe the bitmap code is waking up regularly to do nothing.
Would you be happy to experiment? Remove the bitmap with
mdadm --grow /dev/mdX --bitmap=none
and see how that affects cpu usage?
Thanks,
NeilBrown
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