Prologue: sda old but works, sdc defective. I will replace sdc.
First of all, mark disk sdc as defective and remove from raid.
mdadm --manage /dev/md0 --fail /dev/sdc2 mdadm --manage /dev/md1 --fail /dev/sdc1 mdadm --manage /dev/md2 --fail /dev/sdc3 mdadm /dev/md0 -r /dev/sdc2 mdadm /dev/md1 -r /dev/sdc1 mdadm /dev/md2 -r /dev/sdc3
Physically replace disk and copy partition table to new one.
Continue reading “Replace defective HDD on CentOS 6 (mbr)”