Reformatting the one of the drive in the hard disk , which has boot loader

Reformatting the one of the drive in the hard disk , which has boot loader

To fix below error : “/dev/sda1 is apparently in use by the system; will not make a filesystem here!”

[root@ecmtest2 /]# mkfs.ext3 /dev/sda1

mke2fs 1.43-WIP (20-Jun-2013)

/dev/sda1 is apparently in use by the system; will not make a filesystem here!

System is not allowing to format one drive part of same hard disk which has Boot loader

Hard disk : /dev/sda

File mount / :

/dev/sda4 on / type ext4

/dev/sda3 on /boot type ext4 (rw)

/dev/sda1 on vfat : that should be changed to ext3

1. Get Disk Mapper by fdisk command

fdisk -l /dev/sda1

/dev/sda1 1 121602 976762583+ ee GPT

Partition 1 does not start on physical sector boundary.

Disk /dev/mapper/OVM_SYS_REPO_PART_35000c50092db5a04: 993.9 GB, 993933656064 bytes

Here mapper ID : OVM_SYS_REPO_PART_35000c50092db5a04

2.remove the mapper

 dmsetup remove OVM_SYS_REPO_PART_35000c50092db5a04e

3.Run the format command again

mkfs.ext4 /dev/sda1

4.Edit the /etc/fstab