On 19/04/2009 22:04, Piergiorgio Sartor wrote:
Why would you want a RAID-1 without superblock. I generally
consider that a legacy configuration.
Ah! I was thinking about it as a method to
build a RAID with an already existing disk
or partition, which cannot be modified.
Well, something somewhere is going to have to change; at the very least
you're going to have to stop whatever's using the filesystem, unmount
it, do whatever to create the new RAID-1 incorporating the original
disc, and remount the filesystem now on the new md device.
So instead you could create a new RAID-1 md device with (a superblock
and) one disc missing, create a filesystem on it, stop your original
filesystem, copy its contents to the new md device, mount it, and add
the original disc into the new md device.
If you've too much data to be able to afford the downtime copying, use
rsync with the appropriate options while the filesystem's still in use,
then again after it's been stopped; the second copy will complete far
faster than the full copy.
Cheers,
John.
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