1 - Creating the Volume Group
# pvs PV VG Fmt Attr PSize PFree /dev/sda3 rootvg lvm2
a- 62.75G 38.97G /dev/dm-10 lvm2 -- 70.00G 70.00G
/dev/dm-13 lvm2 -- 70.00G 70.00G /dev/dm-14 lvm2
-- 70.00G 70.00G /dev/dm-9 lvm2 -- 70.00G 70.00G
# vgcreate vg_cluster00 /dev/dm-10 /dev/dm-13 /dev/dm-14 /dev/dm-9
Volume group "vg_cluster00" successfully created
# pvs PV VG Fmt Attr PSize PFree /dev/dm-10
vg_cluster00 lvm2 a- 70.00G 70.00G /dev/dm-13 vg_cluster00 lvm2
a- 70.00G 70.00G /dev/dm-14 vg_cluster00 lvm2 a- 70.00G 70.00G
/dev/dm-9 vg_cluster00 lvm2 a- 70.00G 70.00G /dev/sda3 rootvg
lvm2 a- 62.75G 38.97G
# vgs VG #PV #LV #SN Attr VSize VFree
rootvg 1 9 0 wz--n- 62.75G 38.97G
vg_cluster00 4 0 0 wz--n- 279.98G 279.98G
2 - Creating the Logical Volumes
# vcreate -L180G vg_cluster00 -n lvuserapp
3 - Making the Cluster
Particulary I like system-config-cluster
This is my simple /etc/cluster/cluster.conf
<?xml version="1.0"?> <cluster alias="CLUSTER00" config_version="23"
name="CLUSTER00"> <fence_daemon post_fail_delay="0"
post_join_delay="3"/> <clusternodes> <clusternode name="node001"
nodeid="1" votes="1"> <fence> <method name="1"/> </fence> </clusternode>
<clusternode name="node003" nodeid="3" votes="1"> <fence> <method
name="1"/> </fence> </clusternode> <clusternode name="node004"
nodeid="4" votes="1"> <fence> <method name="1"/> </fence> </clusternode>
<clusternode name="node002" nodeid="2" votes="1"> <fence> <method
name="1"/> </fence> </clusternode> </clusternodes> <fencedevices/>
</cluster>
4 - making gfs2 filesystems
# mkfs -t gfs2 -p lock_dlm -t CLUSTER00:lvuserapp -j 8
/dev/vg_cluster00/lvuserapp
5 - mounting GFS2 filesystems
Put on the /etc/fstab file
/dev/vg_cluster00/lvuserapp /home/userapp gfs2
defaults 0 0
6 - Start the cluster services
Note: For complete startup start the service on all nodes.
service cman start service rgmanager start
7 - Check the nodes
# cman_tool nodes Node Sts Inc Joined Name 1
M 196 2009-04-09 11:57:16 node001 2
M 216 2009-04-09 11:57:32 node002 3
M 212 2009-04-09 11:58:02 node003 4
M 214 2009-04-09 11:58:32 node004
8 - mounting the filesystems
Mount filesystems on all nodes
# mount /home/userapp
9 - testing the read/write files on nodes
# touch /home/userapp/teste.txt
Check on all servers if this file exist.
Sources:
- http://www.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5/html/Cluster_Logical_Volume_Manager/index.html
- http://www.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5/html/Cluster_Administration/index.html
- http://www.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5/html/Global_File_System_2/index.html
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