Hello Hamish,
> The other option that gets my attention is "stripe=96", but I'm not
> sure I understand what that does in a RAID 1 array. Is this another
> option I should change?
ext4(5) says
stripe=n
Number of filesystem blocks that mballoc will try to use for
allocation size and alignment. For RAID5/6 systems this should
be the number of data disks * RAID chunk size in filesystem
blocks.
RAID 5 and 6 are https://en.wikipedia.org/wiki/Raid_5#RAID_5
Your NAS is RAID 1 which is a simple mirror so striding doesn't really
make sense and you should leave mballoc() to its default behaviour.
AIUI, striding tries to even wear and increase performance by evenly
spreading ‘hot’, that is frequently read/written, filesystem metadata
across multiple disks where each disk is storing a fragment of the
information.
--
Cheers, Ralph.
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