IBM System Storage DS4000, Hardware Manual

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Chapter 4. IBM System Storage DS planning and configuration
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4.9.5 Configuring storage partitioning
We explain the concept of storage partitioning in 4.1.4, “Storage partitioning” on page 116.
Here we show an example of configuring partitions for a FC host. If you need a specific
procedure for iSCSI attachment, see IBM Midrange System Storage Implementation and Best
Practices Guide, SG24-6363.
Because heterogeneous hosts can be attached to the DS5000 storage subsystem, you need
to configure storage partitioning for two reasons:
򐂰 Each host operating system requires slightly different settings on the DS5000 storage
subsystem. You need to tell the storage system the host type to which it is attached.
򐂰 There is interference between the hosts if every host has access to every logical drive. By
using storage partitioning and LUN masking, you ensure that each host or host group only
has access to its assigned logical drives. You can have up to 256 LUNs assigned to a
single storage partition. You might have a maximum of 2048 LUNs configured per DS5000
storage subsystem.
The overall process of defining the storage partitions is as follows:
1. Define host groups.
2. Define hosts.
3. Define host ports for each host.
4. Define storage partitions by assigning logical drives to the hosts or host groups.
The Subsystem Management has an specific view called
Mappings
. From this view, you can
display the current status, create your hosts and hosts groups, and map the logical drives to
them.
Selecting the Mappings view, if you have not defined any storage partitions, opens the
Mapping Start-Up Help window (shown in Figure 4-66). The information in the window
advises you to only create host groups if your plan includes sharing logical volumes across
different hosts, normally a cluster.
Figure 4-66 Mappings Start-Up Help