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System Administration Guide

How to Enable Forced Direct I/O on a UFS File System

  1. Become superuser.

  2. Mount a file system with the forcedirectio mount option.


    # mount -F ufs -o forcedirectio /dev/dsk/c0t3d0s7 /datab

  3. Verify the mounted file system has forced direct I/O enabled.


    # mount
                    .
                    .
                    .
/export/home on /dev/dsk/c0t3d0s7 forcedirectio/setuid/read/write/largefiles
on Mon May 12 13:47:55 1997