File Systems

What does a file system do?

Stores data on storage devices, performs I/O operations

What are the 3 ext file systems?

ext2, ext3, ext4

What is the maximum file and volume size in ext2?

2TB file, 4TB volume

What is the downside to ext2?

It takes a long time to recover after an abrupt shutdown

What does ext3 have that makes it better than ext2?

Journaling

How does journaling work?

It keeps a log of the most recent transactions and whether they are pending or complete

What is the maximum file and volume size in ext4?

16TB file, 1Exabyte volume

What is special about btrfs?

It uses copy on write

What are btrfs snapshots?

An image of all your data that can be saved to external media

What command do you use to create file systems?

mkfs -t

What command do you use to make a swap file system?

mkswap

What must you do before creating a swap partition?

Make the partition a swap partition

What command do you use to turn on a swap partition? What about turning it off?

swapon /dev/partiton, swapoff /dev/partition

What command do you use to unmount file systems?

umount /dev/*

What is the file path for the config file that makes mounted file systems persistent?

/etc/fstab

What is the disadvantage of the mount command?

All fs mounted will be unmounted when the system reboots

What is the format you add entries to the fstab file in?

/dev/* /mountpoint fs defaults 1 2