HP Application Recovery Manager software A.06.10 Administrator's guide (March 2008)

is started), Application Recovery Manager generates a list of command devices
connected to every application and backup system in the cell.
• Every command device is assigned an instance number (starting from 301) and
the system (hostname) having access to it. If a command device can be accessed
from more than one system, Application Recovery Manager recognizes that the
command device is assigned to another system; such command device-hostname
combination gets the next available instance number.
Thus, every XP attached to the application and backup systems has a list of
command devices and systems having access to these devices (together with an
instance number).
• Whenever during a session the application or backup system needs access to
XP, it uses the first assigned command device with the instance number from the
list. If the command device fails, the next device from the list is used. If all devices
fail, the session fails. If successful, a command device is used by a system until
the end of the session, and the list of command devices is used for all consecutive
sessions.
Use the omnidbxp command to:
• Assign a command device (identified by XP serial number and LDEV number) to
a particular system. Optionally, you can assign an instance number. If the instance
number is not specified, Application Recovery Manager assigns the lowest
unassigned instance number.
• List all command devices in XPDB.
• Update the information about a command device.
• Remove one or all command devices from XPDB.
See the HP Application Recovery Manager software command line interface reference
or omnidbxp man page for command syntax and the examples.
XP LDEV exclude file
You can reserve certain LDEVs for purposes other than Application Recovery Manager
backup and restore. A session is aborted if the participating replica contains an
excluded LDEV.
Disabled mirrors are listed in the XP LDEV exclude file on the Cell Manager:
• HP-UX /var/opt/omni/server/db40/xpdb/exclude/XPexclude
• Windows: AppRM_home\db40\xpdb\exclude\XPexclude
Mirrors listed in this file must be backup system LDEVs identified by the backup system
LDEV#.
Configuration and maintenance68