Veritas Storage Foundation 5.1 SP1 Advanced Features Administrator"s Guide (5900-1503, April 2011)

For example for DB2 to mount a file system named /datavol on a mount point

named /db2data:

To enable Concurrent I/O on a new SMS container using the namefs -o cio option

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Using the mountcommand, mount the directory in which you want to put data

containers of the SMS tablespaces using the Concurrent I/O feature.

# /usr/sbin/mount -Vt namefs -o cio /path_name /new_mount_point

where:

■ /path_name is the directory in which the files that will be using Concurrent

I/O reside

■ /new_mount_point is the new target directory that will use the Concurrent

I/O feature

The following is an example of mounting a directory (where the new SMS

containers are located) to use Concurrent I/O.

To mount an SMS container named /container1 on a mount point named /mysms:

# /usr/sbin/mount -Vt namefs -o cio /datavol/mysms/container1 /mysms

To enable Concurrent I/O on an existing SMS container using the namefs -o cio

option

Stop the DB2 instance using the db2stop command.

Make the directory that will have Concurrent I/O turned on available using

the mv command.

# mv /mydb/mysmsdir /mydb/mysmsdir2

Remount /mydb/mysmsdir2 on /mydb/mysmsdir using the mount command

with the -o cio option.

# mount -Vt namefs -o cio /mydb/mysmsdir2 /mydb/mysmsdir

Start the DB2 instance using the db2start command.

# db2stop

# mv /mydb/mysmsdir /mydb/mysmsdir2

# mount -Vt namefs -o cio /mydb/mysmsdir2 /mydb/mysmsdir

# db2start

This example shows how to mount a directory for an existing SMS container to

use Concurrent I/O.

103Improving database performance with Veritas Concurrent I/O

Enabling and disabling Concurrent I/O