let suppose sda and sdb is raid 1 md1 and new sdc remove sdb from raid mdadm /dev/md1 -f /dev/sdb mdadm /dev/md1 -r /dev/sdb then create degraded raid 5 don't forget md1 is still running mdadm --create /dev/md2 --level 5 -n 3 /dev/sdb /dev/sdc missing then copy all data from md1 to md2 fix /etc/fstab and /boot/grub/grub.conf destroy md1 and add sda to md2
2009/11/28 Dan Cowsill <[email protected]> > Hello list, > > Currently I have two terabyte hard disks in a RAID1 configuration > using software RAID. What I'd like to do is add a third disk and > arrive at the end with a RAID5 array. The problem is I have limited > disk space and not enough room to back up all of the data on the array > in its current form. What I'd like to know is if it is possible to > use two disks to make a degraded RAID5 array, move the data onto it > from one of the mirror disks, and then add the mirrored disk into the > new array? > > Thanks, > D > > -- Ларин Андрей тел 89093090949
