Types of filesystems ext2,ext3 ReiserFS XFS GFS GPFS Lustre Resources Comparison of filesystems in Linux PV208 Advanced Topics of Linux Administration Bc.yAw Pavol !"#$%&'()+,-./012345<z Babinčák March 2008 . Types of filesystems ext2,ext3 ReiserFS XFS GFS GPFS Lustre Resources Types of filesystems ² Disk file systems: ² ext2, ext3 ² ReiserFS ² XFS ² many more ² Shared disk file systems (known also as SAN or cluster filestems): ² GFS ² GPFS ² Lustre ² others . Types of filesystems ext2,ext3 ReiserFS XFS GFS GPFS Lustre Resources Extended file system (ext2, ext3) Designed for Linux. Default file system for many popular Linux distributions. Second extended file system: ² very stable ² through fault can hurt file system ² unfortunately repair is easy … but quite slow ext3 = ext2 + journaling: ² compatible with ext2 ² repair is fast … but some metadata operations are slow ² automatic consistency check ² immutable files and append-only files . Types of filesystems ext2,ext3 ReiserFS XFS GFS GPFS Lustre Resources ReiserFS Third version of ReiserFS in Linux kernel. Reiser4 not yet merged into mainline. ² good for small files ² not so stable ² less support Features in Reiser4: ² plugin driven filesystem ² transactions . Types of filesystems ext2,ext3 ReiserFS XFS GFS GPFS Lustre Resources XFS One of first journaling FS under UNIX. In Linux kernel since 2.4. ² best for large files, big directories, big filesystems ² slow repair ² creation/deletion of directory entries are slow Features in XFS: ² delayed allocation for reducing fragmentation ² native backup/restore utilities able to make FS dump without unmounting . Types of filesystems ext2,ext3 ReiserFS XFS GFS GPFS Lustre Resources Global File System (GFS) GFS2 is available in kernel since 2.6.19. ² cluster filesystem ² all nodes are equal, running are controlling access to shared resources ² failure cluster member affects only other members using shared resources Features: ² direct I/O support allows databases to acheive high performance ² dynamic multi-path routing around failed components in SAN . Types of filesystems ext2,ext3 ReiserFS XFS GFS GPFS Lustre Resources General Parallel File System (GPFS) ² proprierary, generally bundled with IBM hardware ² used on very large clusters (up to 2000 nodes) ² high performance and grids GPFS features: ² SQL based syntax policies for file placement and management ² shared disk or network block I/O configuration ² offer clustered NFS (High Availability) ² snapshot by copy-on-write . Types of filesystems ext2,ext3 ReiserFS XFS GFS GPFS Lustre Resources Lustre Named from words Linux and Cluster. It is not in main kernel but patches to support it exists. Architecture: ² uses modified ext3 as storage FS ² single metadata target ² typicaly 2-8 object storage servers ² clients accessing to data Features: ² support for high availability, recovery, transparent reboots ² data blocks stripped across objects (bandwith agregation, not limited by size of target object) . Types of filesystems ext2,ext3 ReiserFS XFS GFS GPFS Lustre Resources Resources ² Choosing and Tuning Linux File Systems: http://www.valhenson.org/review/choosing.pdf ² Design and Implementation of the Second Extended Filesystem: http://e2fsprogs.sourceforge.net/ext2intro.html ² Symmetric Cluster Architecture and Component Technical Specifications (about GFS): http://people.redhat.com/~teigland/sca.pdf Wikipedia keywords: Reiserfs, XFS, IBM General Parallel File System, Lustre (file system), Shared disk file system . Types of filesystems ext2,ext3 ReiserFS XFS GFS GPFS Lustre Resources Thanks for your attention . ..