Hi,
I just had a thought, now that we're seeing much larger drives becoming
available, like 6TB-drives, it would be nice if it was possible to take an
array consisting of 2TB-drives, replace a few of them with 6TB-drives
(with want-replace) and then tell MD to restripe the entire array onto
these fewer larger drives.
Concrete example:
10 bays, currently RAID6 in 9 disks + 1 spare, all disks 2TB ones.
If I took out the spare and replaced it with a 6TB drive and one by one,
did want-replace so 5 of the drives were 6TB drives, I now potentially
have the space to keep the same contents on 5 6TB drives intead of 9 2TB
drives.
If I told mdadm to reduce the number of data drives to 5, would it then
intelligently choose the 5 largest ones and keep the data area intact (or
even grow it a little), or what would it do? If this is not the case,
could this functionality needed be added to the feature request list,
whereever that list might live?
--
Mikael Abrahamsson email: swmike@xxxxxxxxx
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