srvctl

The Server Control command line utility (srvctl) provides the DBA a method to manage all aspects of RAC and ASM database instances including their associated services. The srvctl utility is run as a command line invocation as shown here:

Only certain combinations of srvctl commands and objects are valid. The most common use case scenarios include:

 

The options then depend upon the command and object type combination. For example, to start the entire RAC database (all instances on all nodes), then the command syntax is as follows:

 

 

To start a specific RAC database instance or instances, the command is:

 

 

To start the RAC node’s node apps (e.g. CRS and RAC infrastructure – including ASM and listener), the command is:

 

 

Storage Management

ocfs2console 

When using the Oracle Cluster File System version 2 (OCFS2) for the Linux RAC environments’ shared storage, Oracle provides a series of command line utilities for managing OCFS. The first, ocfs2console, launches a simple GUI screen (Figure 4.5) to perform key fundamental OCFS administrative tasks. It must be run as root.

 

 

Besides the obvious mount and unmount available on the main menu’s toolbar, ocfs2console supports the following five key OCFS2 administrative tasks:

1.      Cluster->Configure Nodes: screen for defining the nodes, names, IP addresses and ports for the nodes in the cluster, which results in the population of the OCFS2 configuration file: /etc/ocfs2/cluster.conf.

2.      Cluster->Propagate Configuration: utility to copy the OCFS2 configuration file to all the nodes defined for that cluster.

3.      Tools->Format: utility to format an unmounted device to contain an OCFS2 file system.

4.      Tools->Check: utility to verify a mounted volume as containing a valid, i.e. undamaged, OCFS2 file system.

5.      Tools->Repair: utility to attempt repairs on unmounted OCFS2 volume.

 

mkfs.ocfs2 

The mkfs.ocfs2 command is used to create an OCFS2 file system on a device. The command syntax is as follows:

 

 

Where the options are:

 

-b	--block-size	Block Size
-C	--cluster-size	Cluster Size
-F	--force	Force Formatting
-J	--journal-options	Journal Options
-L	--label	Volume Label
-M	--mount	Mount Type
-N	--node-slots	Number of Node Slots
-T		File System Type
-q	--quiet	Quiet
-v	--verbose	Verbose
-V	--version	Version
	--no-backup-super	Do not backup super block

 

tunefs.ocfs2

The tunefs.ocfs2 command is used to adjust OCFS2 file system parameters on disk. The command syntax is as follows:

 

 

 

Where the options are:

 

-J	--journal-options	Journal Options
-L	--label	Volume Label
-M	--mount	Mount Type
-N	--node-slots	Number of Node Slots
-S	--volume-size	Extend the size
-Q	--query	Query B    Block size in bytes T    Cluster size in bytes N    Number of node slots R    Root directory block number Y    System directory block number P    First cluster group block number V    Volume label U    Volume uuid M    Compat flags H    Incompat flags O    RO Compat flags
-q	--quiet	Quiet
-U	--uuid-reset	Change the volume UUID
-v	--verbose	Verbose
-V	--version	Version
	--backup-super	Backup super block

 

 

fsck.ocfs2

The fsck.ocfs2 command is used to check an OCFS2 file system. The command syntax is as follows:

 

 

Where the options are:

 

-b		Super Block offset to read
-B		Block Size
-f		Force
-F		Skips cluster service check
-G		Ask if mismatched inodes unused
-n		No answer to all fsck questions
-r		Recover using backup # from 1-6
-y		Yes answer to all fsck questions
-v		Verbose
-V		Version

 

 

mounted.ocfs2

The mounted.ocfs2 command detects all OCFS2 volumes on a system. The command syntax is as follows:

 

 

Where the options are:

 

-d		List volumes, labels and UUID’s
-f		List volumes and nodes mounted

 

For more details on Oracle utilities, see the book "Advanced Oracle Utilities" by Bert Scalzo, Donald K. Burleson, and Steve Callan. You can buy it direct from the publisher for 30% off directly from Rampant TechPress.