Setting The Command Device - HP XP P9500 Configuration Manual

Figure 7 System configuration example and setting example of command device and virtual
command device by in-band and out-of-band methods

Setting the command device

RAID Manager commands are issued to the RAID storage system via the command device. The
command device is a user-selected, dedicated logical volume on the storage system that functions
as the interface to the RAID Manager software on the UNIX/PC host. The command device is
dedicated to RAID Manager communications and cannot be used by any other applications. The
command device accepts read and write commands that are executed by the storage system and
returns read requests to the UNIX/PC host.
The command device can be any OPEN-V device that is accessible to the host. A LUSE volume
cannot be used as a command device. The command device uses 16 MB, and the remaining
volume space is reserved for RAID Manager and its utilities. A Virtual LUN or Virtual LVI volume
as small as 36 MB can be used as a command device.
First you set the command device using LUN Manager, and then you define the command device
in the HORCM_CMD section of the configuration definition file for the RAID Manager instance on
the attached host. When you use a command for provisioning, user authentication is required. Set
enable the user authentication on the security attribute of a command device.
To set a command device:
1. Make sure the device that will be set as a command device does not contain any user data.
Once a volume is set as a command device, it is inaccessible to the host.
2. Log on to Remote Web Console, and connect to the storage system on which you want to set
a command device.
38 Installing and configuring RAID Manager