OCFS2: Difference between revisions
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'''OCFS''' |
'''OCFS''' ('''Oracle Cluster File System''') is a [[shared disk file system]] developed by [[Oracle Corporation]] and released under the [[GNU General Public License]]. |
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The first version of OCFS was developed with the main focus to accommodate oracle database files for [[clustered database]]s. Because of that it was not an [[POSIX]] compliant file system. With version 2 the POSIX features were included. |
The first version of OCFS was developed with the main focus to accommodate oracle database files for [[clustered database]]s. Because of that it was not an [[POSIX]] compliant file system. With version 2 the POSIX features were included. |
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Revision as of 08:58, 23 March 2011
| Developer(s) | Oracle Corporation |
|---|---|
| Full name | Oracle Cluster File System |
| Introduced | March 2006 with Linux 2.6.16 |
| Limits | |
| Max volume size | 4 PB (OCFS2)[1] |
| Max file size | 4 PB (OCFS2)[1] |
| Max filename length | 255 bytes |
| Allowed filename characters | All bytes except NUL and '/' |
| Features | |
| Dates recorded | modification (mtime), attribute modification (ctime), access (atime) |
| File system permissions | Unix permissions, ACLs and arbitrary security attributes (Linux 2.6 and later) |
| Transparent compression | No |
| Transparent encryption | No |
| Data deduplication | No |
| Copy-on-write | Yes |
| Other | |
| Supported operating systems | Linux |
OCFS (Oracle Cluster File System) is a shared disk file system developed by Oracle Corporation and released under the GNU General Public License.
The first version of OCFS was developed with the main focus to accommodate oracle database files for clustered databases. Because of that it was not an POSIX compliant file system. With version 2 the POSIX features were included.
OCFS2 (version 2) was integrated into the version 2.6.16 of Linux kernel. Initially, it was marked as "experimental" (Alpha-test) code. This restriction was removed in Linux version 2.6.19. With kernel version 2.6.29 more features have been included into ocfs2 especially access control lists and quota.[2]
OCFS2 uses a distributed lock manager which resembles the OpenVMS DLM but is much simpler.[3]
See also
- Global File System (GFS)
- General Parallel File System (GPFS)
- List of file systems
- Lustre (file system)
- QFS
Notes and references
- ^ a b Currently limited to 16TiB since it uses the Linux JBD
- ^ http://thread.gmane.org/gmane.linux.kernel/775637
- ^ http://lwn.net/Articles/137278/
External links
- OCFS2 project page
- OCFS project page
- Documentation/filesystems/ocfs2.txt in the Linux tree
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