SYS: Create, mount, unmount, and use ext2, ext3, and ext4 file systems.

# mkfs.ext2 /dev/vg/lv_vol
# mkfs.ext3 /dev/vg/lv_vol
# mkfs.ext4 /dev/vg/lv_vol

# mount /dev/vg/lv_vol /mnt

/dev/vg/lv_vol /mnt ext4 defaults 1 2

# fsck /dev/vg/lv_vol

# mount -o remount,ro /dev/vg/lv_vol
# tune2fs -j /dev/vg/lv_vol
# mount -o remount,rw /dev/vg/lv_vol

# umount /dev/vg/lv_vol
# /sbin/tune2fs -O ^has_journal /dev/vg/lv_vol
# /sbin/e2fsck -y /dev/vg/lv_vol
# mount -t ext2 /dev/vg/lv_vol /mnt
# cd /mnt
# rm -f .journal

# tune2fs -O extent,uninit_bg,dir_index /dev/vg/lv_vol

# dumpe2fs /dev/vg/lv_vol

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4 comments on “SYS: Create, mount, unmount, and use ext2, ext3, and ext4 file systems.”

1. limweipin says:

   March 31, 2015 at 3:58 am

   hi, I am having confusion in between /dev/mapper/vg-lv and /dev/vg/lv. When should we use /dev/mapper/vg-lv? Is it when there is lv create we use /dev/mapper/vg-lv while if it is a partition we use /dev/sda1? And i also see LUKS encryption is using /dev/mapper/vol too?

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   • CertDepot says:

     March 31, 2015 at 9:02 am

     From my current understanding, you need to use /dev/mapper/vg-lv for LUKS encryption (which is not a RHCSA/RHCE 7 topic any more). For the rest, you can use either /dev/mapper/vg-lv or /dev/vg/lv.

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     • david.paige says:

       April 11, 2017 at 5:06 am

       The first (/dev/vg/lv) is LVM1. The second (/dev/mapper/vg-lv) is LVM2. Either method can be used for LVM2.

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       • CertDepot says:

         April 11, 2017 at 9:51 am

         Thanks for this information.

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