Question on Veritas file system.. Post: 302861049

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Top Forums UNIX for Dummies Questions & Answers Question on Veritas file system.. Post 302861049 by Roshan4u on Tuesday 8th of October 2013 02:45:56 AM

10-08-2013

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Question: When using Oracle Disk Manager with Veritas vxfs, what should be the proper setting for filesystem mount options (and file system io options), disk_async_io, convosync and DBWR processes?

Answer: Every system has different optimizations, but here are some guidelines for optimizing Veritas vxfs on Oracle. The Veritas Cluster Server, supporting Oracle RAC, is pretty much an extended and enhanced version of the VCS used for database failover clusters. Veritas DBE/AC is a certified cluster framework that is built in with Cluster File System and it is ODM compliant.

Set direct I/O for Veritas: convosync=direct. It is also possible to enable direct I/O on a per-file basis using Veritas QIO; refer to the "qiostat" command and corresponding man page for hints.

Oracle’s DBWR now writes continuously without waiting for previous writes to complete. The new design allows DBWR to act as if it were inherently synchronous, regardless of whether the operating system supports asynchronous I/O or not.

To determine whether to use multiple DBWn processes or database slaves, follow these guidelines:

Use db_writer_processes for most write intensive applications. One per CPU is the recommended setting.

Use db_writer_processes for databases that have a large data buffer cache.

Use dbwr_io_slaves for applications that are not write intensive and run on operating systems that support asynchronous I/O.

Use dbwr_io_slaves on platforms that do no support asynchronous I/O.

Use dbwr_io_slaves on single CPU systems. Multiple DBWR processes are CPU intensive.

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vxinstall

vxinstall(1M)															     vxinstall(1M)

NAME

       vxinstall - menu-driven Veritas Volume Manager initial configuration procedure

SYNOPSIS

       vxinstall

DESCRIPTION

       The  vxinstall utility provides a menu driven interface to configure Veritas Volume Manager (VxVM).  If you install the Veritas Volume Man-
       ager software package using the operating system's package administration commands, you can run vxinstall to configure VxVM for initial use
       on your system.

       Note: If you use the Veritas software installation scripts, do not run this utility.

OPERATIONS

       Licensing
	    vxinstall  first asks if you want to view the Veritas licenses already installed on the system.  Answering "yes" is equivalent to exe-
	    cuting the vxlicrep command (see vxlicrep(1)).

	    You are then asked if you want to add licenses for other Veritas products.	Answering "yes" is equivalent  to  running  the  vxlicinst
	    command (see vxlicinst(1)).  and entering a license key.

       Enclosure-Based Naming
	    You  can choose whether you want to use disk access names that are based on the device names assigned by the operating system, or that
	    are based on names that you assign to enclosures.

       System-Wide Default Disk Group
	    You can enter the name for the default disk group (defaultdg).  This is an alias for the disk group name that should be assumed if the
	    -g	option is not specified to a command, or if the VXVM_DEFAULTDG environment variable is undefined.  By default, defaultdg is set to
	    nodg (that is, no disk group).

NOTES

       From release 4.0 of VxVM, it is no longer necessary to run vxinstall to configure the rootdg disk group.  Disks	and  disk  groups  may	be
       added  to  VxVM	by  running  commands such as vxdiskadm(1M) or by using the graphical user interface without first running vxinstall.  The
       operation of VxVM does not require any disk groups to have been configured, and a disk group named rootdg does not need to  be  present	on
       the system.  Any disk group may be configured as the default disk group that is to be used with VxVM commands.  Any disk group named rootdg
       has no special significance to VxVM. See the vxdg(1M) manual page for further details.

SEE ALSO

       vxdctl(1M), vxdg(1M), vxdiskadm(1M), vxintro(1M), vxlicinst(1), vxlicrep(1)

VxVM 5.0.31.1							    24 Mar 2008 						     vxinstall(1M)