Env: Oracle Linux 7.6
Oracle Database: 18c
Application: Forms/Report/Webogic
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* Oracle RAC environment ASM file system save all binary files which related to Oracle database like
data files, archives files, rman backup etc...but application we cannot store to ASM system file.
* Purpose to creating this OCFS2 cluster to Oracle Apps forms/reports shared on both node.
An OCFS2 installation consists of two parts, the kernel module and the tools module.
Install on both nodes.
1) Install the ocfs2-tools package.
# yum install -y kernel-uek ocfs2
# yum install -y ocfs2–tools-1.8.6–9
Note: Once you add-cluster "clusterapps" Generated cluster file under this path /etc/ocfs2/cluster.conf move this file to another node under same path...and create on root /ocfs2 folder for map drive.
/dev/sdd /ocfs2 ocfs2 _netdev,default 0 0
2) Create a cluster:
[root@rac01 ~]# o2cb add-cluster clusterapps
3) Add nodes to the cluster:
[root@rac01 ocfs2]# o2cb add-node clusterapps rac01.localdomain --ip 192.168.0.100
[root@rac01 ocfs2]# o2cb add-node clusterapps rac02.localdomain --ip 192.168.0.200
[root@rac01 ocfs2]# fdisk -l
4) Create Shared Disk
Add disk using VM's GUI.....I created disk 17GB....Shared Option
Disk /dev/sda: 75.2 GB, 75161927680 bytes, 146800640 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x000eada5
Device Boot Start End Blocks Id System
/dev/sda1 2048 40302591 20150272 83 Linux
/dev/sda2 * 40302592 64878591 12288000 83 Linux
/dev/sda3 64878592 85358591 10240000 82 Linux swap / Solaris
/dev/sda4 85358592 146800639 30721024 5 Extended
/dev/sda5 85360640 146800639 30720000 83 Linux
Disk /dev/sdb: 53.7 GB, 53687091200 bytes, 104857600 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0xd63fe414
Device Boot Start End Blocks Id System
/dev/sdb1 2048 104857599 52427776 83 Linux
Disk /dev/sdc: 53.7 GB, 53687091200 bytes, 104857600 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x32a41691
Device Boot Start End Blocks Id System
/dev/sdc1 2048 104857599 52427776 83 Linux
Disk /dev/sdd: 17.1 GB, 17056710656 bytes, 33313888 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0xdc6f5ca7
Device Boot Start End Blocks Id System
/dev/sdd1 2048 33313887 16655920 83 Linux
4) Add a disk-based heartbeat to the cluster:
[root@rac01 ocfs2]# o2cb add-heartbeat cluster /dev/sdd
o2cb: Unknown code ocfs 8 while reading region on device '/dev/sdd'
[root@rac01 ocfs2]# o2cb add-heartbeat clusterapps /dev/sdd
[root@rac01 init.d]# /sbin/o2cb.init configure
Configuring the O2CB driver.
This will configure the on-boot properties of the O2CB driver.
The following questions will determine whether the driver is loaded on
boot. The current values will be shown in brackets ('[]'). Hitting
<ENTER> without typing an answer will keep that current value. Ctrl-C
will abort.
Load O2CB driver on boot (y/n) [y]:
Cluster stack backing O2CB [o2cb]:
Cluster to start on boot (Enter "none" to clear) [ocfs2]: clusterapps
Specify heartbeat dead threshold (>=7) [31]:
Specify network idle timeout in ms (>=5000) [30000]:
Specify network keepalive delay in ms (>=1000) [2000]:
Specify network reconnect delay in ms (>=2000) [2000]:
Writing O2CB configuration: OK
checking debugfs...
Setting cluster stack "o2cb": OK
Registering O2CB cluster "clusterapps": OK
Setting O2CB cluster timeouts : OK
[root@rac01 init.d]# /sbin/o2cb.init status
Driver for "configfs": Loaded
Filesystem "configfs": Mounted
Stack glue driver: Loaded
Stack plugin "o2cb": Loaded
Driver for "ocfs2_dlmfs": Loaded
Filesystem "ocfs2_dlmfs": Mounted
Checking O2CB cluster "clusterapps": Online
Heartbeat dead threshold: 31
Network idle timeout: 30000
Network keepalive delay: 2000
Network reconnect delay: 2000
Heartbeat mode: Local
Checking O2CB heartbeat: Not active
Debug file system at /sys/kernel/debug: mounted
[root@rac01 init.d]#
[root@rac01 init.d]# /sbin/o2cb.init online
checking debugfs...
Setting cluster stack "o2cb": OK
Cluster racapps already online
[root@rac01 init.d]#
[root@rac01 init.d]# mkfs.ocfs2 /dev/sdd
mkfs.ocfs2 1.8.6
On disk cluster (o2cb,racapps,1) does not match the active cluster (o2cb,racapps,0).
mkfs.ocfs2 will not be able to determine if this operation can be done safely.
To skip this check, use --force or -F
[root@rac01 init.d]# systemctl enable o2cb
Created symlink from /etc/systemd/system/multi-user.target.wants/o2cb.service to /usr/lib/systemd/system/o2cb.service.
[root@rac01 init.d]# systemctl enable ocfs2
Created symlink from /etc/systemd/system/multi-user.target.wants/ocfs2.service to /usr/lib/systemd/system/ocfs2.service.
[root@rac01 init.d]#
[root@rac01 init.d]# sysctl kernel.panic=30
kernel.panic = 30
[root@rac01 init.d]# sysctl kernel.panic_on_oops=1
kernel.panic_on_oops = 1
[root@rac01 init.d]# /sbin/o2cb.init staus
Usage: /sbin/o2cb.init {start|stop|restart|force-reload|enable|disable|configure|load|unload|online|offline|force-offline|status|online-status}
[root@rac01 init.d]# /sbin/o2cb.init status
Driver for "configfs": Loaded
Filesystem "configfs": Mounted
Stack glue driver: Loaded
Stack plugin "o2cb": Loaded
Driver for "ocfs2_dlmfs": Loaded
Filesystem "ocfs2_dlmfs": Mounted
Checking O2CB cluster "clusterapps": Online
Heartbeat dead threshold: 31
Network idle timeout: 30000
Network keepalive delay: 2000
Network reconnect delay: 2000
Heartbeat mode: Local
Checking O2CB heartbeat: Not active
Debug file system at /sys/kernel/debug: mounted
[root@rac01 ocfs2]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda2 12G 9.0G 2.8G 77% /
devtmpfs 4.7G 0 4.7G 0% /dev
tmpfs 4.7G 148K 4.7G 1% /dev/shm
tmpfs 4.7G 58M 4.6G 2% /run
tmpfs 4.7G 0 4.7G 0% /sys/fs/cgroup
/dev/sda5 30G 25G 4.8G 84% /u02
/dev/sda1 20G 4.2G 16G 22% /u01
tmpfs 945M 20K 945M 1% /run/user/54321
/dev/sr0 59M 59M 0 100% /run/media/oracle/VBox_GAs_6.1.16
/dev/sdd 16G 852M 16G 6% /ocfs2
Help
=====
[root@rac01 ocfs2]# o2cb add-cluster --help
o2cb: Cluster name is invalid ; only alpha-numeric characters allowed
[root@rac01 ocfs2]# o2cb --help
usage: o2cb [--config-file=path] [-h|--help] [-v|--verbose] [-V|--version] COMMAND [ARGS]
The commands are:
add-cluster Add cluster to the config file.
remove-cluster Removes cluster from the config file.
add-node Adds a node to the cluster in the config file.
remove-node Removes a node from the cluster in the config file.
add-heartbeat Adds a heartbeat region to the cluster in the config file.
remove-heartbeat Removes a heartbeat region from the cluster in the config file.
heartbeat-mode Toggles the heartbeat mode between global and local.
list-clusters Lists all the cluster names in the config file.
list-cluster Lists all the nodes and heartbeat regions associated with the cluster in the config file.
list-nodes Lists all the nodes associated with the cluster in the config file.
list-heartbeats Lists all the heartbeat regions associated with the cluster in the config file.
register-cluster Registers the cluster with configfs.
unregister-cluster Unregisters the cluster from configfs.
start-heartbeat Starts global heartbeat.
stop-heartbeat Stops global heartbeat.
cluster-status Returns 0 if cluster online, 1 otherwise.
