Assumption: /dev/sdb has problem and need to replace it with a new drive. sdb has two partitions on raid-1 namely /dev/sdb1 = /boot and /dev/sdb3 = / . 1. cat /proc/mdstat to see the raid information. 2. Use mdadm to fail the drives partition(s) and remove it from the Replacing failed raid 1 drive 30 June 2009 backup
List the partitions of a device (sda): sfdisk -l /dev/sda Test and show consistent check status on device (sda): sfdisk -V /dev/sda Two ways to create new partitions from an old device (sda): (a) Copy the entire partition table from one disk (sda) to another (sdb) sfdisk -d Manage partition tables with sfdisk 29 June 2009 Add new tag