Frank Wittig wrote:
It actually is available.
I've tested it and it worked fine for me. But taking a backup is highly recommended.
The trick is not to use mdadm, since growing with mdadm is not possible at the moment. Use raid-tools instead.
The program raidreconf comes along with raidtools. This prog takes two raid-tab files as input which describe the array configuration before and after reconfiguration. (See man raidreconf for further details)
I'll second both major points here:
raidreconf does work, but it can fail and leave things completely destroyed (imagine one bad block somewhere after parity was partially migrated), so take a backup.
Given that you're taking a backup already then, creating a new array (with its optimized resync) might be faster if its an online backup.
I'm 2 for 4 now on raidreconf working, with the two failures (sadly) being of the "operator error" variety - raidreconf is picky and fails slow if your disk sizes aren't what it expects, I found. It got to the end and ran out of space on me due to a slightly different "250GB" disk size once. The other was a bad block along the way - I should have done smartctl -t long on all drives prior to resize. Both lessons learned...
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