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In Linux, the ext2, ext3, ext4, JFS, Squashfs, UBIFS, Yaffs2, ReiserFS, Reiser4, XFS, Btrfs, OrangeFS, Lustre, OCFS2 1.6, ZFS, and F2FS [11] filesystems support extended attributes (abbreviated xattr) when enabled in the kernel configuration. Any regular file or directory may have extended attributes consisting of a name and associated data.
In POSIX namespace: any UTF-16 code unit (case-sensitive) except / as well as NUL [116] [117] 32,767 characters with each path component (directory or filename) up to 255 characters long [ 116 ] 16 EiB (18.44 EB ) [ 116 ] [ 118 ]
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 ...
Disk Cloning Software Disk cloning capabilities of various software. Name Operating system User Interface Cloning features Operation model License
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 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.
Some researchers have made a functional and experimental analysis of several distributed file systems including HDFS, Ceph, Gluster, Lustre and old (1.6.x) version of MooseFS, although this document is from 2013 and a lot of information are outdated (e.g. MooseFS had no HA for Metadata Server at that time).
XFS was the recommended underlying filesystem for Filestore OSDs, and Btrfs could be used at one's own risk. ext4 filesystems were not recommended due to limited metadata capacity. [24] The BlueStore back end does still use XFS for a small metadata partition. [25]