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| − | + | [[wikipedia:ext4|ext4]] journaling [[File system|file system]] or fourth extended filesystem is a [[journaling file system]] for [[Linux]] and it is the default file system for many Linux distributions such as [[Ubuntu]] and [[Debian]]. [[Red Hat Enterprise Linux|RHEL]] default fs is [[XFS]]. | |
| − | [[wikipedia:ext4|ext4]] | ||
| − | Since [[Linux kernel]] | + | Since [[Linux kernel]] 4.1 on June 2015<ref>https://lwn.net/Articles/639427/</ref>, ext4 natively supports file [[cryptography|encryption]] |
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==Basic commands== | ==Basic commands== | ||
| − | * | + | *[[mkfs]] and [[mke2fs]] |
* Creating an ext4 filesystem: (by default since 2010 will do a quick and lazy initialization <ref>https://en.wikipedia.org/wiki/Ext4#Features</ref>) | * Creating an ext4 filesystem: (by default since 2010 will do a quick and lazy initialization <ref>https://en.wikipedia.org/wiki/Ext4#Features</ref>) | ||
:Creating an ext4 in a disk | :Creating an ext4 in a disk | ||
| − | :: <code>[[mkfs.ext4]] | + | :: <code>[[mkfs.ext4]] /dev/sdX</code> |
:Creating an ext4 FS in an [[Linux Administration/Devices and Filesystems/LVM|LV]]: | :Creating an ext4 FS in an [[Linux Administration/Devices and Filesystems/LVM|LV]]: | ||
:: <code>mkfs.ext4 /dev/vg01/lv01</code> | :: <code>mkfs.ext4 /dev/vg01/lv01</code> | ||
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=== resize2fs === | === resize2fs === | ||
| − | + | [[resize2fs]]<ref>https://manpages.debian.org/stretch/e2fsprogs/resize2fs.8.en.html</ref> file system resizer for ext2/ext3/[[ext4]] (<code>resize2fs /dev/mapper/VolGroup-lv_root</code>). Online resize (expand) is supported in resize2fs since 2006<ref>https://github.com/tytso/e2fsprogs/commit/bf69235ad0073c80386b70caba0e1b58e5f85697</ref>.<ref>https://www.technomenace.com/2014/08/how-to-extend-lvm-on-qcow2-images/</ref>. resize2fs code: https://github.com/tytso/e2fsprogs/blob/master/resize/resize2fs.c. See also: [[ext2online]] | |
| − | == | + | ==EXT4 Features timeline== |
| − | * | + | * 2015 File encryption |
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* 2010 Lazy Initialization<ref>https://en.wikipedia.org/wiki/Ext4#Features</ref> | * 2010 Lazy Initialization<ref>https://en.wikipedia.org/wiki/Ext4#Features</ref> | ||
* 2006 Online [[resize]] (expand) support | * 2006 Online [[resize]] (expand) support | ||
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== Activities == | == Activities == | ||
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# Configure an [[Linux Administration/Devices and Filesystems/LVM|LVM]] Volume with an ext4 filesystem: https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/high_availability_add-on_administration/s1-lvmsetupnfs-haaa | # Configure an [[Linux Administration/Devices and Filesystems/LVM|LVM]] Volume with an ext4 filesystem: https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/high_availability_add-on_administration/s1-lvmsetupnfs-haaa | ||
# Learn about Lazy initialization feature of ext4: https://www.thomas-krenn.com/en/wiki/Ext4_Filesystem#Lazy_Initialization | # Learn about Lazy initialization feature of ext4: https://www.thomas-krenn.com/en/wiki/Ext4_Filesystem#Lazy_Initialization | ||
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== See also == | == See also == | ||
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* [[ZFS]], [[LVM]], [[mdadm]], [[fdisk]] and [[partitions]] | * [[ZFS]], [[LVM]], [[mdadm]], [[fdisk]] and [[partitions]] | ||
* {{XFS}} | * {{XFS}} | ||
| + | * [[tune2fs]] which allows among other actions to modify reserved space<ref>https://help.ubuntu.com/community/InstallingANewHardDrive</ref> | ||
* [[ext2online]] | * [[ext2online]] | ||
* {{JFS2}} | * {{JFS2}} | ||
| + | * [[chfs]] ([[AIX]]) | ||
* {{mount}} | * {{mount}} | ||
* {{Linux Commands privileges}} | * {{Linux Commands privileges}} | ||
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