Neil,
What seems desirable to me is a way to take a new (larger) spare drive and
add it to a RAID1 for a particular RAID 4/5/6 component, and then when
it's sync'd, replace the now redundant small drive with another larger
drive. Wash, rinse, repeat. This way the array is never degraded.
Though I imagine that this particular arrangement doesn't have the
benefit of the stripe rewrite when encountering a latent error on the
drive that is being migrated. [Presumably the failing addresses could
be cycled through the check from userland though, by doing a read above
the stacked RAID.]
One could start a RAID 4/5/6 array over a degraded RAID1 for each
component, (i.e., a degraded RAID1).
I haven't been following the metadata changes closely. Is it possible
to do this with external MD metadata? It can also be done with
device-mapper, but dm-mirror is very immature compared to MD RAID1.
Comments?
Regards,
Bill Rugolsky
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