Hitachi AMS 2000 Series, Reference Manual

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Performing CCI Operations
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Hitachi AMS 2000 Family Command Control Interface (CCI) Reference Guide
for the group, the command execution is interrupted halfway and LUs in
statuses different from each other may exist.
• HORCM instance 
It is possible to describe a volume to be operated by Volume Migration
in the horcm*.conf file, in which a volume to be operated by the other
function such as ShadowImage is described, as the other group in
duplicate. It is also possible to define a volume to be operated by
Volume Migration in the other horcm*.conf file than that for a volume
to be operated by the other function such as ShadowImage and to
operate it from the independent HORCM instance.
Commands to control the Volume Migration
Table 1-36 lists and describes the Volume Migration command parameters.
• Command for volume migration 
CCI supports the volume migration by adding an option (-m cc) to the
paircreate command.
•
• Confirming the migration pair status 
You can check that the RAID group to which the LU that executed the
migration belongs has been changed by referring to the RAID group to
which the LU concerned belongs using the inqraid command.
Table 1-36: Command for Volume Migration
Parameter Value
Command
Name paircreate
Format paircreate -g  group  -d  pair Vol  -m cc –vl[r] –c <size>
Options -m cc: This option instructs the copying of the volume migration to be made.
Note: This option cannot be specified with “-split” option in the same
command.
-vl (-pvol) or -vr (-svol): Specifies the data flow direction and must always
be specified. The -vl (-pvol) specifies the local instruction, that is, an
instruction to copy a local instance LU (P-VOL) to a remote instance LU (S-
VOL) and to maps a copying destination volume (a volume of the remote
instance) to the local instance LU (P-VOL). The -vr (-svol) specifies the
remote instruction, and copies data from a remote instance LU (P-VOL) to a
local instance LU (S-VOL) and maps a copy destination volume (a volume of
the local instance) to the remote instance LU (P-VOL).
-c
<size>: You can use this option to specify the copying pace (1 - 15) to
be used for the initial data copy. You can shorten the copy time by specifying
a large number. Do not use the default value 3.

(1 to 5: slow, 6 to 10: normal, 11 to 15: prior)
If a copying is made at the “normal” pace when the host I/O load is heavy, the
host I/O performance may be deteriorated remarkably. When you want to
prevent the host I/O performance being deteriorated, select the “slow” pace.
Select the “prior” pace only when you want to give much priority to the time
for the completion of the copy than the host I/O performance in a period of
time when the P-VOL is rarely accessed.