I have an 11-disk (D0 - D10) RAID6 array with a hotspare (D11) - a 12 disk array total.
Disk D3 failed earlier today and the hotspare is now being rebuilt (presumably, turning itself into a datacopy of D3). I want to replace the dead D3 with a working disk. The controller is running LSI MegaRAID Storage Manager (v13.04.03.01).
1) Should I wait for the rebuild to complete before replacing D3? I don't want to confuse things and it appears to be rebuilding fine
2) Right now, D11 is still designated as the 'hot spare' when I check the physical drive's info page on the MegaRAID GUI. When I replace D3, should it become the new hotspare and D11 become part of the main array (this would seem most sensible) OR, once D3 is replaced will the [rebuilt] info from D11 be moved BACK onto D3 and then D11 be wiped and retain its role as the hot spare?
I realize question 2 is probably entirely dependent on how the manager decided to do things, but I just don't know if this will be automatic or if I need to actively tell it what to do. As far as I can see there's no option to designate a disk as the hot spare.
Any thoughts or advice regarding greatly appreciated.
Answer
I strongly suggest to first let the controller rebuild the array, then remove the broken disk. After that, when replacing D3 with a working disk, the array should reconstruct D3, restoring D11 to its original hotspare role.
Anyway, please consult your controller manual to be sure what to expect.
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