This article provides steps to create a new file system for an existing Linux virtual machine.
Create a partition on new disk:
[root@ocm12c ~]# ls -l /dev/sd*
brw-rw----. 1 root disk 8, 0 Aug 22 13:00 /dev/sda
brw-rw----. 1 root disk 8, 1 Aug 22 13:00 /dev/sda1
brw-rw----. 1 root disk 8, 2 Aug 22 13:00 /dev/sda2
brw-rw----. 1 root disk 8, 16 Aug 22 13:00 /dev/sdb
[root@ocm12c ~]# fdisk /dev/sdb
Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel
Building a new DOS disklabel with disk identifier 0x10f4c93d.
Changes will remain in memory only, until you decide to write them.
After that, of course, the previous content won't be recoverable.
Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)
WARNING: DOS-compatible mode is deprecated. It's strongly recommended to
switch off the mode (command 'c') and change display units to
sectors (command 'u').
Command (m for help): p
Disk /dev/sdb: 12.9 GB, 12884901888 bytes
255 heads, 63 sectors/track, 1566 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x10f4c93d
Device Boot Start End Blocks Id System
Command (m for help): n
Command action
e extended
p primary partition (1-4)
p
Partition number (1-4): 1
First cylinder (1-1566, default 1):
Using default value 1
Last cylinder, +cylinders or +size{K,M,G} (1-1566, default 1566):
Using default value 1566
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
Create an ext3 file system on the new disk partition created on previous step.
[root@ocm12c ~]# mkfs -t ext3 /dev/sdb1
mke2fs 1.43-WIP (20-Jun-2013)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
786432 inodes, 3144715 blocks
157235 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=3221225472
96 block groups
32768 blocks per group, 32768 fragments per group
8192 inodes per group
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208
Allocating group tables: done
Writing inode tables: done
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done
Run the fdisk command to verify the existence of the new disk partition you created:
[root@ocm12c ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/vg_racprodn1-lv_root 45G 31G 13G 71% / tmpfs 3.9G 80K 3.9G 1% /dev/shm /dev/sda1 477M 55M 397M 13% /boot [root@ocm12c ~]# fdisk -l Disk /dev/sda: 53.7 GB, 53687091200 bytes 255 heads, 63 sectors/track, 6527 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x0003dc55 Device Boot Start End Blocks Id System /dev/sda1 * 1 64 512000 83 Linux Partition 1 does not end on cylinder boundary. /dev/sda2 64 6528 51915776 8e Linux LVM Disk /dev/sdb: 12.9 GB, 12884901888 bytes 255 heads, 63 sectors/track, 1566 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x10f4c93d Device Boot Start End Blocks Id System /dev/sdb1 1 1566 12578863+ 83 Linux Disk /dev/mapper/vg_racprodn1-lv_root: 48.9 GB, 48930750464 bytes 255 heads, 63 sectors/track, 5948 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000 Disk /dev/mapper/vg_racprodn1-lv_swap: 4227 MB, 4227858432 bytes 255 heads, 63 sectors/track, 514 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000
Run below command to create a mount point for the new disk partition:
[root@ocm12c ~]# mkdir /u02
Using vi editor, edit fstab and add this line to add the disk partition to /etc/fstab.
/dev/sdb1 /u02 ext3 defaults 1 3
[root@ocm12c u02]# cat /etc/fstab # # /etc/fstab # Created by anaconda on Wed Aug 5 23:47:34 2020 # # Accessible filesystems, by reference, are maintained under '/dev/disk' # See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info # /dev/mapper/vg_racprodn1-lv_root / ext4 defaults 1 1 UUID=31e76520-7f50-4592-9ced-d4f03d6d95cc /boot ext4 defaults 1 2 /dev/mapper/vg_racprodn1-lv_swap swap swap defaults 0 0 tmpfs /dev/shm tmpfs defaults 0 0 devpts /dev/pts devpts gid=5,mode=620 0 0 sysfs /sys sysfs defaults 0 0 proc /proc proc defaults 0 0 /dev/sdb1 /u02 ext3 defaults 1 3
Restart the Linux virtual machine and validate the new file system is now available.
[root@ocm12c ~]# init 6 [root@ocm12c ~]# login as: root [email protected]'s password: Last login: Sat Aug 22 13:11:09 2020 from 192.168.56.1 [root@ocm12c ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/vg_racprodn1-lv_root 45G 31G 13G 71% / tmpfs 3.9G 72K 3.9G 1% /dev/shm /dev/sda1 477M 55M 397M 13% /boot /dev/sdb1 12G 159M 12G 2% /u02
