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Draft Document for Review March 28, 2011 12:24 pm 7914Admin_Mappings.fm
Chapter 11. Administration - Mappings Tab
In this chapter, we describe the Mappings tab of the IBM System Storage DS Storage
Manager. This tab is primarily used for assigning Logical Drives to host servers. It is done by
storage partitioning (we name this process also “mapping”). This functionality is also known
as “LUN masking”. If a Logical Drive is mapped to a host, it is seen there as a LUN (Logical
Unit Number).
In 3.3.7, “Storage partitioning” on page 63 we explain the concept of storage partitioning. In
this chapter we show practical examples of how to configure storage partitioning for SAS or
FC connected hosts. If you need a specific procedure for iSCSI host attachment, see
Chapter 13, “Administration - iSCSI” on page 317.
Because heterogeneous hosts can be attached to the DS3500 storage subsystem, you need
to configure storage partitioning for two reasons:
Each host operating system requires slightly different settings on the DS3500 storage
subsystem. You need to tell the storage subsystem the host type to which is attached.
There is interference between the hosts if every host has access to every logical drive. By
using storage partitioning (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, and a maximum of 256
LUNs configured per DS3500 storage subsystem.
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