I shrunk md device to suit my needs and now I need to shrink the
partition of each component device so that I can reuse the unused space
on the component disks. Every google search that I encountered only
outlines a method where you fail, remove, re-partition, add, sync each
disk. With bitmap, I guess each sync will be very fast as data is really
not being changed. Since I have raid6, I should be able to work on one
disk at a time without much risk also.
However, is this the recommended method? Why not simply boot on a rescue
system, do not assemble the array, simply change all partitions and
reboot the original system so that the array will get assembled the
normal way? Is this too risky or inferior?
While we are at it, mdadm -E says
Avail Dev Size : 11720780943 (5588.90 GiB 6001.04 GB)
Array Size : 12348030976 (11776.00 GiB 12644.38 GB)
Used Dev Size : 6174015488 (2944.00 GiB 3161.10 GB)
What is Used Dev Size? Is is the last sector used or the number of
sectors used? If my current partition(s) start at 2048, does it mean I
should end the md partitions on or after 6174015488 or (6174015488+2048)?
How do I make mdadm scrub the entire array even though bit map says
there is no need?
Ramesh
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