The main focus of the following example is to provide storage
to your host system using the command-line interface (CLI).
In this example, you wish to provide a host system with two disks
and create a FlashCopy of these two disks. The copy is to be made
available to a second host. These two hosts require that the host
objects that are created, correspond with the group of worldwide port
names (WWPNs) presented by their fibre-channel host bus adapters (HBAs)
to the SAN. You also need to create four virtual disks (VDisks),
one for each of the disks that are to be presented to the hosts. Once
the VDisks are created, you can map two of them to each host. In order
to create the VDisks you need to have a managed disk (MDisk) group
to be able to create them from. You want to spread the 8 MDisks across
two groups and create the source VDisks from one and the target VDisks
from the other. In order to create any of these objects you need
to create a cluster and at least add one more node to the cluster.
The following steps illustrates how this can be done:
- Create a cluster.
- Configure the cluster with an IP address of 9.20.123.456, a fabric speed of 2 GB. Name the cluster examplecluster.
- Add nodes
- knode and lnode to the input/output (I/O) group called io_grp0
in the examplecluster cluster
- mnode and nnode to the I/O group called io_grp1 in the examplecluster
cluster
- Create the MDisk groups maindiskgroup and bkpdiskgroup
- Create 4 VDisks
- 2 VDisks from maindiskgroup
- 2 VDisks from bkpdiskgroup
- Create 2 host objects
- a host object called demohost1 with HBAs that have WWPNs of 10000000C92AD7E5,
and 10000000C92F5123
- a host object called demohost2 with HBAs that have WWPNs of 210000E08B0525D4,
and 210100E08B2525D4
- Create the VDisk-to-host mappings
- Map the two VDisks from maindiskgroup to demohost1
- Map the two VDisks from bkpdiskgroup to demohost2
- Create FlashCopy mappings
- Create a FlashCopy mapping called main1copy that has a background
copy rate of 75
- Create a FlashCopy mapping called main2copy that has a background
copy rate of 50
- Create a FlashCopy consistency group called maintobkpfcopy and
add the 2 FlashCopy mappings to it
- Prepare and trigger (start) the FlashCopy consistency group that
contains these mappings
Note: Once this step is complete, you have
created and allocated storage to your host systems. You have made
two VDisks available to demohost1 and then used FlashCopy to make
backup copies on two VDisks which are accessible to demohost2.