Filesystems: Difference between revisions

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* background checksumming and self-healing for data integrity  
* background checksumming and self-healing for data integrity  
* Built-in stripes (RAID-0), mirrors (RAID-1) and RAID-Z (it's like software RAID-5, but more efficient due to ZFS's copy-on-write transactional model)
* Built-in stripes (RAID-0), mirrors (RAID-1) and RAID-Z (it's like software RAID-5, but more efficient due to ZFS's copy-on-write transactional model)
* there are ports of ZFS to FreeBSD and Mac OSX
* triple parity raid (raidz3) has been added to ZFS [http://blogs.sun.com/ahl/entry/triple_parity_raid_z]
* there are ports of ZFS to FreeBSD and Mac OS X
* the source code license of ZFS is incompatible with the GPL of the Linux kernel, therefore only available as userland filesystem (ZFS-over-FUSE; see see http://www.wizy.org/wiki/ZFS_on_FUSE) on Linux
* the source code license of ZFS is incompatible with the GPL of the Linux kernel, therefore only available as userland filesystem (ZFS-over-FUSE; see see http://www.wizy.org/wiki/ZFS_on_FUSE) on Linux
* installable ZFS/FUSE packages are available e.g. on latest Ubuntu und Fedora (see http://www.linux-magazine.com/w3/issue/103/ZFS.pdf)
* installable ZFS/FUSE packages are available e.g. on latest Ubuntu und Fedora (see http://www.linux-magazine.com/w3/issue/103/ZFS.pdf)

Revision as of 16:37, 1 October 2009

This page serves to give some information on possible filesystems for Linux machines, in particular those that may be used for very large filesystems (many TB). The list is sorted by age!

XFS

  • SGI's filesystem (1994) that was ported to Linux around 2001
  • no 16 TB limitation; max size is 8 Eib (1 exbibyte = 2^60 bytes)
  • no compression and checksumming (data-integrity) features

Ext3

  • fairly old (2001), but well established and well behaved
  • does not support more than 16TB (2^36 bytes)
  • does not support transparent compression
  • does not support checksumming (a data-integrity feature)

ZFS

  • Sun's filesystem which is natively available on Solaris (since 2005)) and OpenSolaris (both of which are freely available)
  • no 16 TB limitation; max size is 2^128 bytes
  • (optional) transparent (gzip) compression (LZO compression available as patch)
  • atomic updates - means that the on-disk state is consistent at all times, there's no need to perform a lengthy filesystem check after forced reboots/power failures
  • background checksumming and self-healing for data integrity
  • Built-in stripes (RAID-0), mirrors (RAID-1) and RAID-Z (it's like software RAID-5, but more efficient due to ZFS's copy-on-write transactional model)
  • triple parity raid (raidz3) has been added to ZFS [1]
  • there are ports of ZFS to FreeBSD and Mac OS X
  • the source code license of ZFS is incompatible with the GPL of the Linux kernel, therefore only available as userland filesystem (ZFS-over-FUSE; see see http://www.wizy.org/wiki/ZFS_on_FUSE) on Linux
  • installable ZFS/FUSE packages are available e.g. on latest Ubuntu und Fedora (see http://www.linux-magazine.com/w3/issue/103/ZFS.pdf)

Ext4

  • fairly new in Linux kernel (stable since 2008); ext4 is based on ext3 (same developers)
  • becoming the default of new versions of Linux distros (Fedora, Ubuntu, ...)
  • no 16 TB limitation; max size is 1 EiB (1 exbibyte = 2^60 bytes)
  • no compression and checksumming (data-integrity) features

btrfs

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