Another RAID level migration question
I have an array on two drives which was set up as a RAID-0, because I needed the space and performance. Now I have another identical drive, ideally I would like to get to RAID-5, but I don't think that is going to fly, so how about RAID-4? I could create with a missing parity drive, then add the drive and see if it will rebuild.
I hope to test this using loop devices, but time is fairly short right now.
Signature · 3 lines
bill davidsen <[email protected]> CTO TMR Associates, Inc Doing interesting things with small computers since 1979
Quoted 7 lines · On Thursday August 9, [email protected] wrote:
I have an array on two drives which was set up as a RAID-0, because I needed the space and performance. Now I have another identical drive, ideally I would like to get to RAID-5, but I don't think that is going to fly, so how about RAID-4? I could create with a missing parity drive, then add the drive and see if it will rebuild.
I hope to test this using loop devices, but time is fairly short right now.
Providing the two drives are exactly the same size (which rounded down to a multiple of 64K), this will work. The parity drive is the last in the list so
mdadm -C /dev/mdX -l4 -n3 -c WHATEVER /dev/sda1 /dev/sdb1 missing
is the sort of thing you want.
NeilBrown