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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LEARN ABOUT HPUX

vxbootsetup

vxbootsetup(1M) 														   vxbootsetup(1M)

NAME

       vxbootsetup - set up system boot information on a Veritas Volume Manager disk

SYNOPSIS

       /etc/vx/bin/vxbootsetup [-g diskgroup] [medianame ... ]

DESCRIPTION

       The  vxbootsetup utility configures physical disks so that they can be used to boot the system. Before vxbootsetup is called to configure a
       disk, the required volumes, standvol, rootvol and swapvol (and optionally, dumpvol) must be created on the disk.  All of these volumes must
       be contiguous with only one subdisk.

       The -g option may be used to specify the boot disk group.

       If  no  medianame arguments are specified, all disks that contain usable mirrors of the root, swap, /usr and /var volumes are configured to
       be bootable.

       If medianame arguments are given, only the disks that are associated with the specified disk names are configured to be bootable.

       vxbootsetup requires that:

       o    The root volume must be named rootvol and must have a usage type of root.

       o    The swap volume must be named swapvol and must have a usage type of swap.

       o    The volumes containing /usr and /var (if any) must be named usr and var, respectively.

       See the chapter "Recovery from Boot Disk Failure" in the Veritas Volume Manager Troubleshooting Guide for detailed information on  how  the
       system boots and how VxVM impacts the system boot process.  The vxmirror, vxrootmir, and vxresize utilities call vxbootsetup automatically.
       If you use vxassist, or vxmake and vxplex to create mirrors of the root volume on a disk, you must run vxbootsetup explicitly to  make  the
       disk bootable.

ARGUMENTS

       medianame
	    Specifies the disk name (disk media name) of a VM disk that is to be configured as bootable.

SEE ALSO

       disksetup(1M),  edvtoc(1M),  vxassist(1M),  vxevac(1M),	vxinstall(1M),	vxintro(1M),  vxmake(1M),  vxmirror(1M), vxplex(1M), vxresize(1M),
       vxrootmir(1M)

       Veritas Volume Manager Troubleshooting Guide

VxVM 5.0.31.1							    24 Mar 2008 						   vxbootsetup(1M)