File Systems - Paiet/Tech-Journal-for-Everything GitHub Wiki

• Determine your filesystem
  • /etc/fstab
  • mount
  • lsblk
• EXT[2,3,4]
  • EXTended File System
  • Default file system for Debian/Ubuntu
  • EXT3 is the most common Linux file system
    • Stable and well supported
    • Uses bitmapping which can be inefficient
    • Introduced support for journaling
    • Convert ext2 to ext3
      • Enables journaling
      • tune2fs -j /dev/sdb1
  • EXT4 is an update to EXT3
    • Increases file and volume sizes
    • Uses extents instead of bitmapping
    • Fully incorporates journaling
  • mkfs.ext4 /dev/sdb1
• XFS
  • EXtents File System
  • Default file system for RHEL/CentOS/Fedora
  • Successor to EXT
  • Increases supported file system sizes
  • Incorporates journaling
  • File system can grow, but cannot shrink
  • mkfs.xfs /dev/sdb1
• BTRFS
  • B-TRee File System
  • Currently in preview
  • Massive file system sizes
  • Incorporates journaling and a number of other features
    • Integrated LVM
  • Not supported in production
  • mkfs.btrfs /dev/sdb1
  • May need to install tools
    • yum install btrfs-progs
    • apt install btrfs-tools

Red Hat Certified Maximums

| File System | Maximum File Size | Maximum Volume Size | |-------------|-------------------|---------------------| | EXT3 | 2TB | 16TB | | EXT4 | 16TB | 50TB (1EB) | | XFS | 500TB (8EB) | 500TB (16EB) | | BTRFS | (8EB) | (16EB) |

Source: https://access.redhat.com/solutions/1532