Dynamic Root Disk A.3.12.* Administrator's Guide

files_to_be_copied_by_drd_sync, even if the drd sync command is run with the
-p preview option.
Copying the files to the inactive clone image
The drd sync command uses the /usr/bin/pax command to propagate changes from the
booted original system to the inactive clone.
IMPORTANT: The original system must be booted when drd sync is run, and changes are
always propagated from the original system to the clone.
The current limitations apply to actual propagation of changes:
• If a new hard link is created to a file that existed when the clone was created, the drd sync
command does not recognize that the file should be created as a hard link on the inactive
clone image, and creates a new copy of the file with the new (hard-linked) name. In rare
cases, this could result in an “insufficient space” error on the clone during synchronization.
• If a permission or ownership of a file on the original booted system is changed, the modification
time of the file is not updated, so this change by itself does not cause the file to be copied to
the clone. However, new permission or ownership of the file is propagated to the clone when
it is copied.
The copy of a file to the inactive clone image does not include modification of any file system
access control lists (ACLs) on the clone.
Using the drd sync preview to determine divergence of the clone from
the booted system
If many changes were made to the booted system after the clone was created, it can be preferable
to run drd clone rather than attempt to use drd sync to update the inactive clone. To determine
the extent of the changes to the booted system, run drd sync with the -p preview option:
# /opt/drd/bin/drd sync -p
Next, examine the /var/opt/drd/files_to_be_copied_by_drd_sync file. If the file is
large, consider running drd clone to re-create the clone.
Additional information can be obtained by examining other files in /var/opt/drd/sync, which
are described in “The drd sync command” (page 26).
drd sync system shutdown script
To run the following script during system shutdown, create the script in the /sbin/init.d directory
and create a symlink to it from /sbin/rc[n].d/K[mmm]. The system administrator can choose
values for n and mmm to ensure that file updates made during shutdown occur before the script is
run. The script must be run before file systems are unmounted, which is generally done by /sbin/
rc0.d/K900localmount. See rc(1) for further information on rc script numbering.
#!/sbin/sh
#
# synchronize source root group with cloned root group
# drd-sync(1M).
#
PATH=/sbin:/usr/sbin:/usr/bin:/opt/drd/bin
export PATH
rval=0
DRD_MOUNT_PT=/var/opt/drd/mnts/sysimage_001
set_return() {
if [ $1 -ne 0 ]; then
echo $2
rval=1
fi
}
case $1 in
stop_msg)
echo "Running drd sync to synchronize cloned root file systems"
;;
28 Synchronizing the inactive clone image with the booted system