Monthly Archives: December 2010

11g, hp-ux, network, Oracle, Oracle 10g, oracle 9i, RAC, unix

Configuration of OCFS2 in LINUX

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OCFS2 Oracle Cluster File System version 2 is a file system which allows for multiple machines to open the same files at the same time without corruption. This file system can be used for multiple reasons but is mostly seen in Oracle RAC systems. This article details the configuration of OCFS2 after the RPMs have been installed on your OS.

1. Logon to your Linux server as root.

2. Create the directory /etc/ocfs2 to house your oracle cluster.conf file. This file will contain the name of your cluster and all nodes with in that cluster.

[root@mylinux1 etc]# mkdir /etc/ocfs2
[root@mylinux1 etc]# chmod 775 /etc/ocfs2

3. Edit the file cluster.conf and enter the strings similar to below; changing the value of ip_address, name and cluster to values which are correct for your installation..

[root@mylinux1 etc]# vi /etc/ocfs2/cluster.conf

node:
ip_port = 7777
ip_address = 204.34.132.38
number = 0
name = mylinux1.mydomain.com
cluster = myrac

node:
ip_port = 7777
ip_address = 204.34.132.39
number = 1
name = mylinux2.mydomain.com
cluster = myrac

cluster:
node_count = 2
name = myrac

4. Configure the ocfs2 installed on each node of the RAC with the o2cb configure command. NOTE: Enter the following:


Load O2CB driver on boot (y/n) [y] = y
Cluster stack backing O2CB [o2cb] = o2cb
Cluster to start on boot (Enter “none” to clear) [ocfs2]: = name of the cluster in cluster.conf file for this example it is myrac
Specify heartbeat dead threshold (>=7) [31] = 31
Specify network idle timeout in ms (>=5000) [30000] = 30000
Specify network keepalive delay in ms (>=1000) [2000] = 2000
Specify network reconnect delay in ms (>=2000) [2000] = 2000

Example:
[root@mylinux1 etc]# /etc/init.d/o2cb 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
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]: myrac
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
Starting O2CB cluster myrac: OK
[root@mylinux1 etc]#

[root@mylinux2 etc]# /etc/init.d/o2cb 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
without typing an answer will keep that current value. Ctrl-C
will abort.

Load O2CB driver on boot (y/n) [n]: y
Cluster stack backing O2CB [o2cb]:
Cluster to start on boot (Enter “none” to clear) [ocfs2]: myrac
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
Loading filesystem “configfs”: OK
Mounting configfs filesystem at /sys/kernel/config: OK
Loading filesystem “ocfs2_dlmfs”: OK
Creating directory ‘/dlm’: OK
Mounting ocfs2_dlmfs filesystem at /dlm: OK
Starting O2CB cluster myrac: OK
[root@mylinux2 etc]#


This completes configuration of OCFS2 for Oracle RAC.

Larry J. Catt, OCP 9i, 10g
oracle@allcompute.com
www.allcompute.com

11g, hp-ux, installer, Oracle, Oracle 10g, oracle 9i, unix

Download and Installation of OCFS2 RPMs for Linux

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Oracle Cluster File System 2 (OCFS2) is a file system which allows for multiple hosts to access the same files on a shared storage at the same time. This type of access is required for deployment of an Oracle RAC system. In this article we will cover the procedure to download and install the RPMs for OCFS2 to support shared storage on an Oracle RAC system.

1. Determine the current Kernel installed on all RAC nodes. NOTE: The kernels must be the same on every RAC node.

NODE 1:
[root@mylinux1 etc]# uname -r
2.6.18-194.32.1.el5
[root@mylinux1 etc]#

NODE2:
[root@mylinux2 ~]# uname -r
2.6.18-194.32.1.el5
[root@mylinux2 ~]#

2. Go to the URL: http://oss.oracle.com/projects/ocfs2/ , select the download tab and navigate to the correct rpm download for your kernel.

2.6.18-194.32.1.el5
2011.01.20
Packages for RHEL5 2.6.18-194.32.1.el5

3. Go to the URL: http://oss.oracle.com/projects/ocfs2-tools/, select the download tab and navigate to the correct rpm downloads for your OS. Example for this OS we download the following files:

ocfs2-tools-1.4.4-1.el5.x86_64.rpm
2010.04.19 7a2f59a05f2cf1bea24dc04f34b09371
OCFS2 tools
ocfs2-tools-debuginfo-1.4.4-1.el5.x86_64.rpm
2010.04.19 91d6e65e902dedcd28e8e4f2d9fb4271
OCFS2 tools debuginfo
ocfs2-tools-devel-1.4.4-1.el5.x86_64.rpm
2010.04.19 2e47beaab89ebba8b1d276fb894184d5
OCFS2 tools libraries/header
ocfs2console-1.4.4-1.el5.x86_64.rpm
2010.04.19 78ccf0cf8564a6d5b48d534c7f3a07bc

4. Once the download completes transfer all the files to all nodes in the cluster. It is best at this point to create a temporary directory under /tmp, to store your files with the following command.

[root@mylinux1 tmp]# mkdir oracle_tmp
[root@mylinux1 tmp]# chmod 777 oracle_tmp
[root@mylinux1 tmp]#

5. Once the files are in location, logon as root and install using the rpm command on all nodes of the RAC.

rpm -Uvh ocfs2-tools-1.4.4-1.el5.x86_64.rpm
rpm -Uvh ocfs2-2.6.18-194.32.1.el5-1.4.7-1.el5.x86_64.rpm
rpm –Uvh ocfs2console-1.4.4-1.el5.x86_64.rpm

[root@mylinux1 oracle_tmp]# rpm -Uvh ocfs2-tools-1.4.4-1.el5.x86_64.rpm
warning: ocfs2-tools-1.4.4-1.el5.x86_64.rpm: Header V3 DSA signature: NOKEY, key ID 1e5e0159
Preparing… ########################################### [100%]
1:ocfs2-tools ########################################### [100%]
[root@mylinux1 oracle_tmp]# rpm -Uvh ocfs2-2.6.18-194.32.1.el5-1.4.7-1.el5.x86_64.rpm
warning: ocfs2-2.6.18-194.32.1.el5-1.4.7-1.el5.x86_64.rpm: Header V3 DSA signature: NOKEY, key ID 1e5e0159
Preparing… ########################################### [100%]
1:ocfs2-2.6.18-194.32.1.el########################################### [100%]
[root@mylinux1 oracle_tmp]# rpm -Uvh ocfs2console-1.4.4-1.el5.x86_64.rpm
warning: ocfs2console-1.4.4-1.el5.x86_64.rpm: Header V3 DSA signature: NOKEY, key ID 1e5e0159
Preparing… ########################################### [100%]
1:ocfs2console ########################################### [100%]
[root@mylinux1 oracle_tmp]#

This completes the download and installation of OCFS2 on Linux to support an Oracle RAC system.

Larry J. Catt, OCP 9i, 10g
oracle@allcompute.com
www.allcompute.com

hp-ux, installer, linux, network, Oracle, unix

Change hostname of your Linux server

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Oracle RAC depends heavily on the network, hostnames, and DNS service within a network. In this article we will show how to change the hostname of a LINUX server for the use of Oracle RAC to include the domain name.
1. Logon to your LINUX server as the root user.
2. Open the file /etc/sysconfig/network.
3. Update the parameter HOSTNAME to include the domain name.
[root@mylinux1 ~]# cat /etc/sysconfig/network
NETWORKING=yes
NETWORKING_IPV6=no
HOSTNAME=mylinux1.mydomain.com

[root@mylinux1 ~]#

4. Reboot the server.
5. Issue the command hostname and you will see it is updated.
[root@mylinux1 ~]# hostname
mylinux1.mydomain.com
[root@mylinux1 ~]#

This completes changing the hostname of a LINUX server for Oracle RAC.

Larry J. Catt, OCP9i, 10g
oracle@allcompute.com
www.allcompute.com

11g, hp-ux, installer, linux, Oracle, Oracle 10g, oracle 9i, script, unix

Oracle Installation – Add swap space in UNIX or Linux environment

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The typical Oracle installation will require more swap space on a system, due to prerequisite checks performed by the installer, than is typical available. The following procedure shows how to create additional swap in Unix or Linux.

1. Create a file on /u01 of 12gb with the dd command. NOTE: Repeat on each RAC node.

dd if=/dev/zero of=/u01/tempswap bs=1k count=12000000

Example:

[root@mylinux1 ~]# dd if=/dev/zero of=/u01/tempswap bs=1k count=12000000
12000000+0 records in
12000000+0 records out
12384000000 bytes (12 GB) copied, 64.2111 seconds, 255 MB/s
[root@mylinux1 ~]#

2. Then format your new file with the mke2fs command. NOTE: Repeat on each RAC node.

/sbin/mke2fs /u01/tempswap

Example:

[root@mylinux1 ~]# /sbin/mke2fs /u01/tempswap
mke2fs 1.39 (29-May-2006)
/u01/tempswap is not a block special device.
Proceed anyway? (y,n) y
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
2003424 inodes, 4000000 blocks
200000 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=4097835008
123 block groups
32768 blocks per group, 32768 fragments per group
12288 inodes per group
Superblock backups stored on blocks:
32768, 98304, 123840, 229376, 294912, 819200, 884736, 1205632, 2654208

Writing inode tables: done
Writing superblocks and filesystem accounting information: done

This filesystem will be automatically checked every 29 mounts or
180 days, whichever comes first. Use tune2fs -c or -i to override.
[root@mylinux1 ~]#

3. Make the additional swap space with the mkswap command. NOTE: Repeat on each RAC node.

/sbin/mkswap /u01/tempswap

Example:

[root@mylinux1 ~]# /sbin/mkswap /u01/tempswap
Setting up swapspace version 1, size = 12383995 kB
[root@mylinux1 ~]#

4. Make the swap space available to the OS with the command swapon. NOTE: This will have to be executed after every reboot. Repeat on each RAC node.

/sbin/swapon /u01/tempswap

Example:

[root@mylinux1 ~]# /sbin/swapon /u01/tempswap
[root@mylinux1 ~]#

Larry J. Catt, OCP 9i, 10g
oracle@allcompute.com
www.allcompute.com