mdadm recover from dead drive
mdadm --manage /dev/md3 --add /dev/sda1
cat /proc/mdstat
Personalities : [raid1] [linear] [multipath] [raid0] [raid6] [raid5] [raid4] [raid10]
md0 : inactive sdd2[1] sdd1[2](S)
31270272 blocks
md3 : active raid1 sda1[2] sdb1[1] sdc1[3](F)
943730240 blocks [2/1] [_U]
[>....................] recovery = 4.9% (46270656/943730240) finish=217.0min speed=68900K/sec
unused devices:
Important Install GRUB on the new drive or you won't be able to boot from it:
grub-install /dev/sda
This is critical because you won't be able to boot off the new drive if the other fails (you'll likely just see a flashing cursor after your system posts and will wonder what the issue is).
Change /dev/sda to whatever the new drive that you added is (and I do mean sda and not sda1).
Tags:
mdadm, drivemdadm, dev, md, sda, proc, mdstat, personalities, raid, linear, multipath, inactive, sdd, active, sdb, sdc, _u, min, unused, devices, install, grub, fails, ll, flashing, cursor, posts,