The Global File System The Global File System a shared block file system for Linux.
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The Global File System Description

The Global File System a shared block file system for Linux. GFS (Global File System) is a cluster file system. It allows a cluster of computers to simultaneously use a block device that is shared between them (with FC, iSCSI, NBD, etc...). GFS reads and writes to the block device like a local filesystem, but also uses a lock module to allow the computers coordinate their I/O so filesystem consistency is maintained. One of the nifty features of GFS is perfect consistency -- changes made to the filesystem on one machine show up immediately on all other machines in the cluster.GFS consists of a set of kernel patches and userspace programs.The GFS lock module lock_dlm depends on CMAN and DLM.The GFS lock module lock_gulm depends on GULM.The GFS lock module lock_nolock depends on nothing.Some GFS tools depend on the iddev library. Building and Installing1. build and install from cluster treecd cluster./configure --kernel_src=/path/to/kernelmake; make install- This builds and installs kernel modules, libraries and user programs.- Kernel modules can also be built within the original kernel source tree by applying the kernel patches from cman-kernel/patches, dlm-kernel/patches and gfs-kernel/patches.2. build device mapper user spacecd device-mapper./configuremake; make install3. build lvm2/clvmcd LVM2./configure --with-clvmd --with-cluster=sharedmake; make installLVM2/scripts/clvmd_fix_conf.sh /usr/libLoad kernel modulesdepmod -amodprobe dm-modmodprobe gfsmodprobe lock_dlmModules that should be loaded: lock_dlm, dlm, cman, gfs, lock_harness and dm-mod if device-mapper was built as a module.Startup procedureRun these commands on each cluster node:> ccsd - Starts the CCS daemon> cman_tool join - Joins the cluster> fence_tool join - Joins the fence domain (starts fenced)> clvmd - Starts the CLVM daemon> vgchange -aly - Activates LVM volumes (locally)> mount -t gfs /dev/vg/lvol /mnt - Mounts a GFS file systemShutdown procedureRun these commands on each cluster node:> umount /mnt - Unmounts a GFS file system> vgchange -aln - Deactivates LVM volumes (locally)> killall clvmd - Stops the CLVM daemon> fence_tool leave - Leaves the fence domain (stops fenced)> cman_tool leave - Leaves the cluster> killall ccsd - Stops the CCS daemon

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