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fsck time/Inode Count(ext3 vs. ext4) With ext4 the e2fsck runtime should come down considerably, as can be seen from the graph. As the userspace companion for the ext2, ext3, and ext4 drivers in the Linux kernel, the e2fsprogs are most commonly used with Linux. However, they have been ported to other systems, such as FreeBSD and Darwin.
The Linux kernel allows extended attribute to have names of up to 255 bytes and values of up to 64 KiB, [15] as do XFS and ReiserFS, but ext2/3/4 and btrfs impose much smaller limits, requiring all the attributes (names and values) of one file to fit in one "filesystem block" (usually 4 KiB).
ext4 (fourth extended filesystem) is a journaling file system for Linux, developed as the successor to ext3.. ext4 was initially a series of backward-compatible extensions to ext3, many of them originally developed by Cluster File Systems for the Lustre file system between 2003 and 2006, meant to extend storage limits and add other performance improvements. [4]
In POSIX namespace: any UTF-16 code unit (case-sensitive) except / as well as NUL [114] 32,767 characters with each path component (directory or filename) up to 255 characters long [ cf ] 16 TiB (17.59 TB) to 8 PiB (9.007 PB) [ cw ] [ 115 ]
Disk Cloning Software Disk cloning capabilities of various software. Name Operating system User Interface Cloning features Operation model License
ext4 F2FS FAT FreeVxFS HFS HFS+ HPFS ISO 9660 JFFS JFFS2 JFS MINIX fs NSS NTFS OCFS QNX4 FS System V FS UDF UFS XFS ZFS ReiserFS Reiser4 Btrfs HAMMER Tux3 exFAT ReFS; DragonFly BSD kernel: No No No No No No No Yes No No No Yes No No No No Yes No No No No No limited write No No No read only Yes No No No No No Yes No No No FreeBSD kernel: No No ...
The extended file system, or ext, was implemented in April 1992 as the first file system created specifically for the Linux kernel. Although ext is not a specific file system name, it has been succeeded by ext2, ext3, and ext4.
In computing, an extent is a contiguous area of storage reserved for a file in a file system, represented as a range of block numbers, or tracks on count key data devices. A file can consist of zero or more extents; one file fragment requires one extent.