On Sat, 02 Feb 2013 15:52:12 -0600
Stan Hoeppner <stan@xxxxxxxxxxxxxxxxx> wrote:
> So under heavy read load, in this case we'd probably want the slow 3TB drive
> to contribute to the workload.
No, it should behave as documented.
-W, --write-mostly
subsequent devices listed in a --build, --create, or --add com‐
mand will be flagged as 'write-mostly'. This is valid for RAID1
only and means that the 'md' driver will avoid reading from
these devices if at all possible.
if at all possible = if there is any other mirror still alive, do not read from
this one.
BTW I also run an SSD+HDD array, and after a brief testing today I did notice
some reads from the HDD on reading from the array showing up in iostat. So I
can confirm the bug.
--
With respect,
Roman
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