mdadm real example of recovery and rebuilding of the array on Centos 6

In this example we have 2 drives in a RAID array and /dev/sdb is the one that failed.  /dev/sda1 is also the /boot partition which we tell grub to install on /dev/sdb eg install root (hd0,0) /dev/sda1 on the new drive /dev/sdb (hd1)
 

First copy the partition table from /dev/sda to /dev/sdb

dd if=/dev/sda of=/dev/sdb bs=512 count=1

Run partprobe to detect the new partition table
partprobe

Add the partitions of the replacement drive /dev/sdb back to the array


mdadm --manage /dev/md0 -a /dev/sdb1
mdadm --manage /dev/md1 -a /dev/sdb2
mdadm --manage /dev/md2 -a /dev/sdb3

 

Install grub on the new drive
grub
root (hd0,0)
setup (hd1)


Tags:

mdadm, rebuilding, array, centos, raid, dev, sdb, sda, partition, grub, install, eg, hd, dd, bs, partprobe, detect, partitions, replacement, md,

Latest Articles

  • Linux How To Create A RamDisk
  • mdadm force resync when resync=PENDING solution
  • Proxmox Breaks Storage/LVM Backing If Killing QEMU-IMG
  • Proxmox trying to acquire lock... TASK ERROR: can't lock file '/var/lock/qemu-server/lock-102.conf' - got timeout
  • Debian 9 SSH root password authentication failure password not working problem / solution
  • QEMU / KVM How To Manually Create Basic Virtual Machine VM
  • Linux wlan0 check all wireless clients
  • PHP Issues With Decoding Strange Smart Quotes And Non-Standard ASCII Characters
  • /etc/iproute2/rt_tables default settings file in Linux Centos 6,7 and most other NIX's
  • bind named error solutions named[2169]: error (no valid DS) resolving / error (broken trust chain) resolving / : error (no valid RRSIG) resolving 'com/DS/IN':
  • iptables how to log ALL dropped incoming packets
  • How To Edit Linux Based NM Network Manager Connection Settings Without GUI
  • Linux Disable IPV6 Centos / Debian / Mint Howto
  • Linux use growisofs to burn a larger file on a BD-R / Bluray Disc
  • Linux partprobe/partx cannot access last and 4th partition
  • DRBD Errors Caused By Physical Corruption
  • mdadm: add new device failed for /dev/sdb4 as 3: Invalid argument solution
  • Linux named / bind how to dump, view and clear the cache!
  • Centos 6 / 7 / 8 How To Change Default nameservers in /etc/resolv.conf when using DHCP / dhclient
  • Adobe Acrobat Reader for Linux to use and view XFA Fillable Forms