Enabling Concurrent I/O for Sybase

Article:HOWTO59592  |  Created: 2011-10-12  |  Updated: 2011-10-12  |  Article URL http://www.symantec.com/docs/HOWTO59592
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How To




Enabling Concurrent I/O for Sybase

Because you do not need to extend name spaces and present the files as devices, you can enable Concurrent I/O on regular files.

Before enabling Concurrent I/O, review the following:


  • To use the Concurrent I/O feature, the file system must be a VxFS file system.

  • Make sure the mount point on which you plan to mount the file system exists.

  • Make sure the DBA can access the mount point.

To enable Concurrent I/O on a file system using mount with the -o cio option

  • Mount the file system using the mount command as follows:

    On AIX:

      # /usr/sbin/mount -V vxfs -o cio special /mount_point

    On HP-UX and Solaris:

      # /usr/sbin/mount -F vxfs -o cio special /mount_point

    On Linux:

      # /usr/sbin/mount -t vxfs -o cio special /mount_point


    • special is a block special device.

    • /mount_point is the directory where the file system will be mounted.

For example for Sybase, to mount a file system named /datavolon a mount point named /sybasedata:


  # /usr/sbin/mount -V vxfs -o cio /dev/vx/dsk/sybasedg/datavol \

On HP-UX and Solaris:

  # /usr/sbin/mount -F vxfs -o cio /dev/vx/dsk/sybasedg/datavol \

On Linux:

  # /usr/sbin/mount -t vxfs -o cio /dev/vx/dsk/sybasedg/datavol \

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

See Enabling and disabling Concurrent I/O

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