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Chapter 7. Storage system logical partition overview

A storage system logical partition (LPAR) allows the division of a single server into

two completely independent virtual storage systems.

A logical partition uses hardware and firmware to logically allocate the resources

between partitions.

The storage system logical partition function is currently supported on the DS8300

Model 9A2/9B2. It allows you to have two virtual storage systems in one physical

machine. Each storage system logical partition can run different levels of licensed

machine code. Typically, the different machine code levels of a common release are

compatible. However, certain levels of licensed machine code might not be

compatible if the later licensed machine code level contains substantial

enhancements. If your levels of licensed machine code are not compatible, you can

contact IBM support to request instructions for installing the two different licensed

machine code levels. In addition, if each logical partition runs a different level of

machine code, you can contact IBM support to request a code level upgrade on

either partition. Your requests will be evaluated and approved based on the

feasibility with your particular configuration.

The default resource allocation for processors, memory, and I/O slots in the two

storage system logical partitions on the DS8300 is divided into a fixed ratio of

50/50 percent. If variable partitions are required, the resource allocation for

processors and memory can be changed to 25/75 percent or 75/25 percent. See

“Variable logical partition implementation” on page 98 for more information.

Note: Each storage system logical partition can have 255 logical subsystems (LSSs)

with LSS IDs 0–254.

DS8300 LPAR implementation

The DS8300 Model 9A2/9B2 provides a split between the resources.

Each storage image uses the machine type/model number/serial number of the

DS8300 Model 9A2/9B2 base frame. The frame serial number ends with a 0. The

last character of the serial number is replaced by a number in the range one to

eight that uniquely identifies the DS8000 image. This character is a 1 or a 2,

because there are only two available storage images. The serial number

distinguishes between the storage images in the GUI and CLI. The serial number is

also used for licensing and the allocation of licenses between the storage images.

Figure 8 on page 98 illustrates the default DS8300 LPAR resource allocation.

IBM DS8000 User Manual

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