HP XP7 Storage - Manual (Page 74)

Device group definition methods
To define a device group or copy group in the RAID Manager that supports P9500 or later, use
one or both of following methods.
•
Execute a command
Create a device group with the raidcom add device_grp command, and execute the raidcom
add copy_grp command specifying the name of the device group to define a copy group.
When the command is executed, a description corresponding to HORCM_LDEV of RAID
Manager is defined in the storage system. Then, define HORCM LDEVG in the configuration
file to incorporate it into the RAID Manager instance. This can be executed at RAID Manager
that supports P9500 or later.
•
Define a configuration definition file
Define HORCM_LDEV or HORCM_DEV of the configuration definition files of the primary and
secondary volumes. For definition details, see
“Configuration definition file” (page 25) .
A device name is a name given to an LDEV in each device group. This is equivalent to the dev_name
definition of HORCM_DEV. A device name is not required, but it is convenient to use to specify
device group or device name instead of LDEV number. However, to create a pool or a journal,
specifying LDEV number is required.
The LDEVs that have the same device name are recognized as a pair in the primary and secondary
device group. Therefore, make match the device name for the LDEV to be a pair. Also, the number
of LDEVs in the device group must be the same at the primary and secondary sides. Pairs are
operated in the ascending sequence of the LDEV numbers. If there is no corresponding device
name of LDEV in the device group to be paired, an error might be occurred on the pair operation.
Read operations and command device settings
When grouping LDEVs, if HORCM_LDEVG on the primary side and secondary side is not defined,
the read operation of RAID Manager is different depending on the command device settings. The
following table shows the details.
Table 21 Reading of command device setting and group information
Security to be set Reading of device
group or copy
group information Command device setting HORCM_LDEVG
Group
information
acquisition User
authentication Security
No security Do not read OFF OFF OFF Not defined
Only
HORCM_DEV
allowed Do not read ON
User authentication
required Read
1
OFF ON OFF
User authentication
required Do not read ON
Only
HORCM_DEV
allowed
CMD security Read
1
OFF OFF ON
CMD security Do not read ON
Only
HORCM_DEV
allowed
74 RAID Manager functions on the P9500 and XP7 Storage