Red Hat APPLICATION STACK 1.2 RELEASE Manual de usuario descargar pdf (Pagina 20)

Chapter 3. Storage and File Systems

3.2. ext4

Migration from ext3

It is recommended that those wishing to make use of ext4 start with a freshly formatted partition.

However, you may install Red Hat Enterprise Linux 6 with the ext4migrate boot option if you wish to

convert your legacy ext3 partitions to ext4. It is important to note that by doing this you will not receive

all of the benefits ext4 offers, since the data currently residing on the partition will not make use of the

extents features and other changes. New data will however make use of extents. Passing this boot

option to migrate to ext4 is not recommended and it is strongly recommended that you back up file

systems before attempting this migration.

Behavioral changes

Red Hat Enterprise Linux 6 provides full support for ext4 and it is the default file system for new

installations. This section explains the major changes in behaviour that this new file system introduces.

• The included version of the GRUB bootloader provides full support for ext4 partitions. The installer

also allows you to place any /boot file system on an ext4 partition.

• The included version of the e2fsprogs package is fully compatible with ext4.

• In some cases, ext4 file systems created under Red Hat Enterprise Linux 5.3 with the e4fsprogs

package created an ext4dev file system type. The test_fs feature flag identifying these file

systems as a development version can be removed with the following command: tune2fs -E

^test_fs. This is done so that these file systems will be recognized as regular ext4 file systems.

3.3. blockdev

blockdev

The blockdev --rmpart command option is no longer supported. The partx(8) and

delpart(8) commands now provide this functionality.

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Red Hat APPLICATION STACK 1.2 RELEASE Manual de usuario Pagina 20