Command Execution By The In-Band And Out-Of-Band Methods - Hitachi VSP F1500 User And Reference Manual

The following table shows the checking function combinations between the
precheck function and the transaction mode.
Command syntax
raidcom <command>
raidcom <command> -checkmode precheck
raidcom -zt <script file>
raidcom get ldev -ldev_id -cnt 65280
-store<work_file>
raidcom -zt <script_file> -load <work_file>
raidcom -zt <script file> -checkmode precheck
raidcom get ldev -ldev_id -cnt 65280
-store<work_file>
raidcom -zt <script_file> -load <work_file>
-checkmode precheck

Command execution by the in-band and out-of-band methods

The two methods for issuing commands from a host are the in-band method
and the out-of-band method:
• In-band method
The method issues a command from a UNIX/PC host connected directly to
a storage system via Fibre Channel or iSCSI. Older CCI versions (that do
not support VSP) can only issue commands by using the in-band method.
In this method, when a command is issued, it is sent to the dedicated
LDEV (command device) of the storage system selected by the user via
Fibre Channel or iSCSI from CCI on the host.
• Out-of-band method
This method issues commands from a UNIX/PC host connected to the
storage system via LAN. As shown in the following figure, CCI supporting
VSP and later models can issue commands using the out-of-band method.
Client PCs that are not connected directly to storage systems can execute
the same scripts as the in-band method.
When a command is issued by using the out-of-band method, the
command is sent to a virtual command device via LAN from CCI on the
host. Virtual command devices are created when a command is executed
using the out-of-band method. A virtual command device can be created
by specifying the location to create a virtual command device in the
configuration definition file. For details on how to create command
devices, see
however, that the location you can create virtual command devices varies
Table 1-2 Summary of the checking functions
HORCM_CMD (out-of-band method) on page
Command Control Interface User and Reference Guide
Syntax Context
check check
Executed Not
executed
Executed Not
executed
Executed Executed
Executed Executed
Executed Executed
Executed Executed
Overview
Config
Execution
check
Not Executed
executed
Not Not
executed executed
Not Executed
executed
Executed Executed
Not Not
executed executed
Executed Not
executed
2-21. Note,
1-5