HP Data Protector A.06.11 Command Line Interface Manual page 132

for other purposes than Data Protector backup and restore. The disabled LDEVs are,
if used in a Data Protector session, ignored by Data Protector and such a session
fails with critical error. The list of disabled LDEVs is kept in the XP LDEV exclude file
on the Cell Manager:
Data_Protector_program_data\db40\exclude\XPexclude (Windows
Server 2008), Data_Protector_home\db40\exclude\XPexclude (other
Windows systems), or
/var/opt/omni/server/db40/xpdb/exclude/XPexclude (UNIX systems).
The omnidbxp options to be used for querying the XPDB and manipulating the XP
LDEV exclude file are: -exclude, -put, -get, -check, -init, -delete,
-session, -list, -show, -ir, -ldev, -show.
HP StorageWorks DISK ARRAY XP COMMAND DEVICE HANDLING
The HP StorageWorks Disk Array XP command devices are needed by any process
that needs access to the HP StorageWorks Disk Array XP. The information about HP
StorageWorks Disk Array XP command devices is kept in the XPDB for the purpose
of eliminating duplicate instance usage and over-allocation. Data Protector provides
the following mechanism to prevent duplicate instance usage and over allocation:
1. Whenever a session is started, Data Protector queries the XPDB for a list of
command devices. If there is none in the XPDB (default behavior when the first
session is started), Data Protector identifies command devices and generates a
list of command devices in the XPDB as connected to every application and
backup system in the cell.
2. 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, the hostname identifier enables Data Protector to
be aware of the fact that the command device is already meant to be used by
some other system; next available instance number is assigned to such a
command device - hostname combination
3. When the list is created, every HP StorageWorks Disk Array XP attached to
application and backup systems has a list of its command devices and systems
having access to them (together with an instance number) assigned.
4. Whenever during a session an application or backup system needs access to
an HP StorageWorks Disk Array XP, it uses the first assigned command device
with the instance number from the list. If the command device fails, the next
command device from the list assigned to a particular system is used. If all of
them fail, the session fails. The successful command device is used by a particular
system until the end of the session and the list of command devices is used for
all consecutive sessions.
Using the omnidbxp command, it is possible to:
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