OCFS2: Difference between revisions
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OCFS2 used a [[distributed lock manager]] which resembles the [[OpenVMS]] DLM but is much simpler.<ref>{{cite web |url= https://lwn.net/Articles/137278 |title= The OCFS2 filesystem |work= [[LWN.net]] |author= Jonathan Corbet |date= May 24, 2005 |accessdate= October 24, 2016 }}</ref> |
OCFS2 used a [[distributed lock manager]] which resembles the [[OpenVMS]] DLM but is much simpler.<ref>{{cite web |url= https://lwn.net/Articles/137278 |title= The OCFS2 filesystem |work= [[LWN.net]] |author= Jonathan Corbet |date= May 24, 2005 |accessdate= October 24, 2016 }}</ref> |
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Oracle announced version 1.6 in November 2010 which included a [[copy on write]] feature called reflink.<ref>{{Cite web |title= What's new in Oracle Linux Part 1: OCFS2 1.6 REFLINKs |author= John Margaglione |publisher= Oracle |date= November 30, 2010 |url= https://blogs.oracle.com/devpartner/entry/whats_new_in_oracle_linux |accessdate= October 24, 2016 }}</ref> |
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==See also== |
==See also== |
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Revision as of 23:00, 24 October 2016
| 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 |
The Oracle Cluster File System (OCFS, in its second version OCFS2) 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's database management system that used cluster computing. Because of that it was not a 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 in late 2008, more features were included into ocfs2, such as access control lists and quotas.[2][3]
OCFS2 used a distributed lock manager which resembles the OpenVMS DLM but is much simpler.[4] Oracle announced version 1.6 in November 2010 which included a copy on write feature called reflink.[5]
See also
Notes and references
- ^ a b Limited to 16TiB since it uses the Linux JBD
- ^ Mark Fasheh (December 19, 2008). "Ocfs2 patches for merge window batch 1/3". Linux Kernel Mailing List. Retrieved October 24, 2016.
- ^ Mark Fasheh (December 22, 2008). "Ocfs2 patches for merge window batch 2/3". Linux Kernel Mailing List. Retrieved October 24, 2016.
- ^ Jonathan Corbet (May 24, 2005). "The OCFS2 filesystem". LWN.net. Retrieved October 24, 2016.
- ^ John Margaglione (November 30, 2010). "What's new in Oracle Linux Part 1: OCFS2 1.6 REFLINKs". Oracle. Retrieved October 24, 2016.
External links
- OCFS2 project page
- OCFS project page
- "OCFS2 filesystem". 2011-08-11.