5.10. File Systems

5.10.1. Ext4 - das Standard-Dateisystem

Fedora 11 benutzt ext4 als Standard-Dateisystem. ext4 bringt merkbare neue Eigenschaften und Leistungsverbesserungen mit sich, inkl:

Verbesserungen in Dateisystemen und Grössen
- Dateisystem-Grösse wurde vergrössert auf ein Exabyte (1 EB)
- Dateigrössen-Limit ist sechszehn Terabytes (16 TB)
- Keine Limitierung der Anzahl Unterverzeichnisse
Leistung
- Extents increase performance in certain situations, especially large files
- Multiblock allocation is a new file block allocation method with faster write speed
- These combine with delayed allocation of blocks for better performance and fragmentation

5.10.1.1. Buffered Data Loss Mitigation

The recent news about buffered data loss experienced during a system crash with ext4 has resulted in upstream, and thus F11, flushing file data on a truncate or rename to mitigate this issue.

5.10.1.2. Migration von ext3 nach ext4

It is generally recommended that users wishing to make use of ext4 start with a freshly formatted partition. However you may install with the ext4migrate boot option if you wish to convert your legacy ext3 partitions to ext4. Users are cautioned that they will not realize many of the benefits ext4 since the data currently residing on the partition will not make use of extents. New data will make use of extents. Please note that as suggested by the requirement to pass a boot option that migration to ext4 has not been heavily tested and users are urged to backup filesystems before attempting migration

5.10.1.3. Keine Unterstützung für grub

Currently grub doesn't support booting from an ext4 partition so make sure to utilize ext2/3 for /boot

5.10.2. btrfs - das Linux-Dateisystem der nächsten Generation

Fedora 11 makes btrfs, the next-generation Linux filesystem available as a technology preview. To enable btrfs pass icantbelieveitsnotbtr as a boot potion. Users are warned that btrfs is still experimental and under heavy development. The on-disk format may yet change and much functionality is still missing such as a fully operative fsck or even proper out-of-space handling.

5.10.2.1. Keine Unterstützung für grub

Currently grub doesn't support booting from a btrfs partition so make sure to utilize ext2/3 for /boot