I have moved to a RAID 5 setup in my linux box with 4 drives set to
master on 4 IDE channels, and one spare drive as the slave on one of
those channels. In setting things up, I marked one of the 'master'
drives as 'failed-disk' in my raidtab so that I could copy the data from
that disk onto the raid then raidhotadd it in once the data had been
copied over and my system was running entirely on the raid.
So, when I mkraid'd the array, the spare disk was used in liu of the
failed disk as I would suspect. I copied over all my data to the raid,
rebooted, partitioned the formerly 'failed-disk' properly, changed
'failed-disk' to 'raid-disk' in /etc/raidtab, and 'raidhotadd'd it back
into the array. I expected the array to reconstruct on this disk and
put the spare-disk back as a spare, but that's not the case. Now, the
newly added disk seems to be the spare, and the 'slave' disk is still in
the array (which makes for bad performance). How can I tell the array
to replace the slave disk with the disk that I just added? I figure I
could just unplug the slave and let it reconstruct, but that doesn't sit
well with me.
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