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The Global File System 6.1pre21

Company: Michael Declerck
Date Added: October 10, 2013  |  Visits: 223

The Global File System

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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.<br /><br />GFS consists of a set of kernel patches and userspace programs.<br />The GFS lock module lock_dlm depends on CMAN and DLM.<br />The GFS lock module lock_gulm depends on GULM.<br />The GFS lock module lock_nolock depends on nothing.<br />Some GFS tools depend on the iddev library.<br /><br />Building and Installing<br /><br />1. build and install from cluster tree<br />cd cluster<br />./configure --kernel_src=/path/to/kernel<br />make; make install<br /><br />- This builds and installs kernel modules, libraries and user programs.<br /><br />- 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.<br /><br />2. build device mapper user space<br />cd device-mapper<br />./configure<br />make; make install<br /><br />3. build lvm2/clvm<br />cd LVM2<br />./configure --with-clvmd --with-cluster=shared<br />make; make install<br />LVM2/scripts/clvmd_fix_conf.sh /usr/lib<br /><br />Load kernel modules<br /><br />depmod -a<br />modprobe dm-mod<br />modprobe gfs<br />modprobe lock_dlm<br /><br />Modules that should be loaded: lock_dlm, dlm, cman, gfs, lock_harness and dm-mod if device-mapper was built as a module.<br /><br />Startup procedure<br /><br />Run these commands on each cluster node:<br /><br />> ccsd - Starts the CCS daemon<br />> cman_tool join - Joins the cluster<br />> fence_tool join - Joins the fence domain (starts fenced)<br />> clvmd - Starts the CLVM daemon<br />> vgchange -aly - Activates LVM volumes (locally)<br />> mount -t gfs /dev/vg/lvol /mnt - Mounts a GFS file system<br /><br />Shutdown procedure<br /><br />Run these commands on each cluster node:<br /><br />> umount /mnt - Unm

Requirements: No special requirements
Platforms: *nix, Linux
Keyword: Depmod Devicemapper Dmmod Lvm Clvm Lvm Scriptsclvmd Fix Confsh Modules Usrlib Withcluster Dshared Withclvmd
Users rating: 0/10

License: Freeware Size: 136.19 KB
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