5. Filesystems and Storage
The fourth extended filesystem (ext4) is now a fully supported feature in Red Hat Enterprise Linux 5.6. ext4 is based on the third extended filesystem (ext3) and features a number of improvements, including: support for larger file sizes and offsets, faster and more efficient allocation of disk space, no limit on the number of subdirectories within a directory, faster file system checking, and more robust journaling.
5.1. Logical Volume Manager (LVM)
LVM maintains a small log (on a separate device) which it uses to keep track of which regions are in sync with the mirror or mirrors. Red Hat Enterprise Linux 5.6 introduces the ability to mirror this log device.
Red Hat Enterprise Linux 5.6 introduces the use of the
--splitmirrors argument of the
lvconvert command to split off a redundant image of a mirrored logical volume to form a new logical volume.
LVM in Red Hat Enterprise Linux 5.6 also provides additional configuration options for default data alignment and volume group metadata.