5 create and start the global mirror session – IBM DS6000 User Manual
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IBM System Storage DS6000 Series: Copy Services with IBM System z
Example 26-52 shows the command that creates two FlashCopy relationships.
Example 26-52 mkflash to establish FlashCopy relationships for Global Mirror
dscli mkflash -record -nocp -cfg $DSCLI/profile/DS-02.profile 6500:6502 6501:6503
Date/Time: June 14, 2005 3:28:58 PM EDT IBM DSCLI Version: 5.0.3.134 DS: IBM.2107-7573731
CMUC00137I mkflash: FlashCopy pair 6500:6502 successfully created.
CMUC00137I mkflash: FlashCopy pair 6501:6503 successfully created.
To list the new FlashCopy pairs, use the command
lsflash
as described in 26.11.3, “Query
26.10.5 Create and start the Global Mirror session
For the creation of a Global Mirror session we have the DS CLI command
mksession
. This
command defines a session number and populates the Global Mirror session with Global
Copy source volumes.
Issue the following command to each LSS that has potential Global Mirror volumes:
dscli mksession -lss
Example 26-53 illustrates how to create Global Mirror session number
01
for LSS
65
and add
two Global Copy source volumes to this session.
Example 26-53 mksession to create a session and add two volumes
dsscli mksession -lss 65 -volume 6500-6501 -cfg $DSCLI/profile/DS-01.profile 01
Date/Time: June 14, 2005 3:29:46 PM EDT IBM DSCLI Version: 5.0.3.134 DS: IBM.2107-7506551
CMUC00145I mksession: Session 01 opened successfully.
Note that this command only adds volumes to the newly defined session number
01
. It does
not start the Consistency Groups formation process.
To list the session status, use the
lssession
command, which is described in 26.11.4, “Query
volumes in the session” on page 396.
To start the Consistency Groups formation process, start the Global Mirror session. For this
use the
mkmir
command. Also, when more than one storage disk subsystem participates with
its primary volumes in a common Global Mirror session, you have to specify topology
information in the command that starts the Global Mirror session.
The
mkmir
command has the following syntax:
dscli mkgmir -lss
The following tuning parameters can be set at this time with the command:
cginterval -
Specifies how long to wait between the formation of Consistency Groups. If
this number is not specified or is set to zero, then Consistency Groups are formed
continuously.
coordinate -
Indicates the maximum time that Global Mirror processing queues host I/Os
when Global Mirror starts to form a new Consistency Group. The default is 50 ms.