ext3 is the journaled version of the ext2 filesystem, providing metadata journaling for fast recovery in addition to other enhanced journaling modes like full data and ordered data journaling. It uses an HTree index that enables high performance in almost all situations. In short, ext3 is a very good and reliable filesystem.
Activate the following kernel options for ext3 support:
File systems ---> <*> Ext3 journalling file system support
Support for optional ext3 features:
File systems ---> [*] Default to 'data=ordered' in ext3 [*] Ext3 extended attributes [*] Ext3 POSIX Access Control Lists [*] Ext3 Security Labels
|Default to 'data=ordered' in ext3|
|Ext3 extended attributes||Extended attributes are name:value pairs associated with inodes by the kernel or by users.|
|Ext3 POSIX Access Control Lists||Posix Access Control Lists (ACLs) support permissions for users and groups beyond the owner/group/world scheme.|
|Ext3 Security Labels||Enables an extended attribute handler for file security.|
Large drive support
When the system has large disks (2 TB or greater) and a 32-bit (x86) kernel is being used, the following option must be enabled:
-*- Enable the block layer ---> [*] Support for large (2TB+) block devices and files
USE flags for sys-fs/e2fsprogs Standard EXT2/EXT3/EXT4 filesystem utilities
||Install e2scrub_all cron script|
||Build fuse2fs, a FUSE file system client for ext2/ext3/ext4 file systems|
||Add Native Language Support (using gettext - GNU locale utilities)|
||Enable behavior to support maintaining /bin, /lib*, /sbin and /usr/sbin separately from /usr/bin and /usr/lib*|
||Build static versions of dynamic libraries as well|
||Enable dependencies and/or preparations necessary to run tests (usually controlled by FEATURES=test but can be toggled independently)|
||Build extfs tools (mke2fs, e2fsck, tune2fs, etc.)|
After setting the USE flag update the system so the changes take effect:
emerge --ask --changed-use --deep @world
The mkfs.ext3 command irreversibly destroys any content of the partition it is told to format. Be sure to select the right partition!
To create an ext3 filesystem on the /dev/sda1 partition:
Please replace /dev/sda1 with the actual partition to format.
By default, 5% of available disk space is reserved for the root user. This is usually a good thing for the partition where the / directory is mounted, but it may be not desirable on other partitions. To lose reserve disk space for the root user use mkfs.ext3's
-m 0 option:
mkfs.ext3 -m 0 /dev/sda1
- Ext4 — an open source disk filesystem and most recent version of the extended series of filesystems.