Azitech

Azimout's Linux weblog

ext4

with one comment

ext4 is finally stable in 2.6.28 (first merged in 2.6.19), so I thought I’d read a bit more about it. If I had to sum-up everything in one word, then that word would be: FASTER!

Here’s a summary of the new features:

  • many features to fight fs-fragmentation: extents, delayed allocation, multi-block allocation, and an actual e4defrag command
  • (irrelevant for desktop users) it allows for >32k subdirectories, <=1 exabyte (1 million terabytes) volumes, and <=16 terabyte files
  • faster fs-checking, through a list of unused inodes which don’t need to be checked
  • finer timestamps (previous accuracy was 1 second)
  • journal check-summing (adds reliability and speeds-up commits)

Some remarks:

  • Upgrading from ext3 to ext4 is easy, but only new data will use the new data structures
  • Fedora11’s installer will use ext4 as the default fs, while Ubuntu9.04 will be more conservative and provide it as an option, while using ext3 as the default
  • grub cannot (yet) read ex4 (but there are 2 different efforts underway to change that), so if you wanna make / be ext4, you need a separate ext3 /boot partition

References: Wikipedia.org, wiki.kernel.org, kernelnewbies.org

Advertisements

Written by azimout

26/01/2009 at 22:04

Posted in News

One Response

Subscribe to comments with RSS.

  1. […] ext4 support […]

    jaunty « Azitech

    16/03/2009 at 15:51


Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

%d bloggers like this: