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Guest on 23rd November 2022 01:52:08 AM

  1. Global File System
  2. ------------------
  4. https://fedorahosted.org/cluster/wiki/HomePage
  6. GFS is a cluster file system. It allows a cluster of computers to
  7. simultaneously use a block device that is shared between them (with FC,
  8. iSCSI, NBD, etc).  GFS reads and writes to the block device like a local
  9. file system, but also uses a lock module to allow the computers coordinate
  10. their I/O so file system consistency is maintained.  One of the nifty
  11. features of GFS is perfect consistency -- changes made to the file system
  12. on one machine show up immediately on all other machines in the cluster.
  14. GFS uses interchangeable inter-node locking mechanisms, the currently
  15. supported mechanisms are:
  17.   lock_nolock -- allows gfs to be used as a local file system
  19.   lock_dlm -- uses a distributed lock manager (dlm) for inter-node locking
  20.   The dlm is found at linux/fs/dlm/
  22. Lock_dlm depends on user space cluster management systems found
  23. at the URL above.
  25. To use gfs as a local file system, no external clustering systems are
  26. needed, simply:
  28.   $ mkfs -t gfs2 -p lock_nolock -j 1 /dev/block_device
  29.   $ mount -t gfs2 /dev/block_device /dir
  31. If you are using Fedora, you need to install the gfs2-utils package
  32. and, for lock_dlm, you will also need to install the cman package
  33. and write a cluster.conf as per the documentation. For F17 and above
  34. cman has been replaced by the dlm package.
  36. GFS2 is not on-disk compatible with previous versions of GFS, but it
  37. is pretty close.
  39. The following man pages can be found at the URL above:
  40.   fsck.gfs2             to repair a filesystem
  41.   gfs2_grow             to expand a filesystem online
  42.   gfs2_jadd             to add journals to a filesystem online
  43.   tunegfs2              to manipulate, examine and tune a filesystem
  44.   gfs2_convert  to convert a gfs filesystem to gfs2 in-place
  45.   mkfs.gfs2             to make a filesystem

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