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,

Latest Articles

  • Debian Ubuntu Mint Howto Create Bridge (br0)
  • How To Control Interface that dhcpd server listens to on Debian based Linux like Mint and Ubuntu
  • LUKS unable to type password to unlock during boot on Debian, Ubuntu and Mint
  • Debian Ubuntu and Linux Mint Broken Kernel After Date - New Extra Module Naming Convention
  • Wordpress overwrites and wipes out custom htaccess rules and changes soluton
  • Apache htaccess and mod_rewrite how to redirect and force all URLs and visitors to the SSL / HTTPS version
  • python 3 pip cannot install mysql module
  • QEMU-KVM won't boot Windows 2016 or 2019 server on an Intel Core i3
  • Virtualbox vbox not starting "No suitable module for running kernel found"
  • Bind / named not responding to queries solution
  • Linux Mint How To Set Desktop Background Image From Bash Prompt CLI
  • ImageMagick Convert PDF Not Authorized
  • ImageMagick Converted PDF to JPEG some files have a black background solution
  • Linux Mint Mate Customize the Lock screen messages and hide username and real name
  • Ubuntu/Gnome/Mint/Centos How To Take a partial screenshot
  • ssh how to verify your host key / avoid MIM attacks
  • Cisco IP Phone CP-8845 8800/8900 Series How To Reset To Factory Settings Instructions
  • ls how to list ONLY directories
  • How to encrypt your SSH private key file id_rsa
  • Linux Mint 18 Disable User Name List from showing on Login Screen