When defining a device group or copy group by a command, the command
can be issued from multiple CCI instances because the group information is
defined in the storage system.
Device group definition methods
To define a device group or copy group in the CCI that supports Virtual
Storage Platform 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 CCI is defined in the
storage system. Then, define HORCM LDEVG in the configuration file to
incorporate it into the CCI instance. This can be executed at CCI that
supports Virtual Storage Platform 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 on page 2-13.
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 CCI is different depending on the
command device settings. The following table shows the details.
Table 3-10 Reading of command device setting and group information
HORCM_LDEVG
Command device setting
Reading of
device group or
copy group
information
Security to be set
Security
User
authentication
Group
information
acquisition
Not defined OFF OFF OFF Do not read No security
3-38
CCI functions
Command Control Interface User and Reference Guide
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