1 - When adding 2 missing disks to a RAID-6 (let's say a 4 drive RAID-6
that was created with only 2 disks initally) why does it sync the first,
then sync the second rather than doing both together?
ie mdadm --add /dev/md0 /dev/sd[ab]
2 - If a drive disappears how do I remove it from an array.
Let's say I have a 10 drive RAID-6 that has an odd error on a disk.
The disk goes away (sdl), the disk comes back as sdq as md is still
hanging on to the name sdl. I add sdq to the array, but I can't remove
sdl as it physically no longer exists. udev has removed the device node
and mdadm can't remove it from the array as it can't tell what it was.
Like this :
Personalities : [linear] [raid0] [raid1] [raid10] [raid6] [raid5] [raid4]
md0 : active raid6 sdq[10] sdc[0] sdd[6] sdl[1](F) sdh[9] sda[8] sde[7]
sdg[5] sdb[4] sdf[3] sdm[2]
7814078464 blocks super 1.2 level 6, 64k chunk, algorithm 2
[10/10] [UUUUUUUUUU]
Nothing urgent, just musings after the last weeks oddities.
Regards,
Brad
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