Read operations and command device settings, Device group function – HP XP P9500 Storage User Manual
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HORCM_LDEV of the RAID Manager is defined within the storage system. It can be executed
by RAID Manager supporting P9500 or later.
•
Define a configuration definition file
Defines HORCM_LDEV, HORCM_DEV, and HORCM_LDEVG of the configuration definition
files of the primary and secondary volumes. For definition details, see
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, 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 occur 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 14 Reading of command device setting and group information
Reading of device group or copy
group information
Device group
definition
Command device setting
HORCM_LDEVG
User authentication
Security
setting
Do not read
No
No
No
Not defined
Do not read
Yes
Read
*1
No
Yes
No
Do not read
Yes
Read
*1
No
No
Yes
Do not read
Yes
Read
*1
No
Yes
Yes
Do not read
Yes
Read
*2
-
-
-
Defined
*1
: Read the entire group information in the storage system.
*2
: Read the information of device group and copy group from the contents of the configuration
definition file regardless the setting of command device.
Device group function
A device group is created by specifying a device name and a device group name. Once a device
group is created, the device group name, the LDEV number, and the information if there is copy
group definition or not are stored in the storage system as a configuration information.
The maximum number of device groups is 1,024 in one storage system. The maximum 65,279
LDEVs can be placed under the device group. And one LDEV can be placed in multiple device
groups.
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RAID Manager functions on P9500