Logical partition identifier, MIF Image ID Mifid

6947ch04.fm

Draft Document for Review April 7, 2004 6:15 pm

number of partitions defined in the RESOURCE statements in the IOCDS. It is unique for each logical partition.

Logical partition identifier

The logical partition identifier is a number in the range from ‘00’ to ‘3F’. It is assigned by the user on the image profile through the Support Element (SE) or the Hardware Management Console. It is unique across the z990 and may also be referred to as the User Logical Partition ID (UPID).

MIF Image ID (MIFID)

The Multiple Image facility enables channel sharing among logical partitions pertaining to the same Logical Channel Subsystem.

The MIF Image ID is a number that is defined through Hardware Configuration Dialog (HCD) or directly via the IOCP. It is a number that is specified in the RESOURCE statement in the configuration definitions. It is in the range '1' to 'F' and is unique within an LCSS, but it is not unique within the z990. Multiple LCSSs may specify the same MIF Image ID (the MIFID was called the logical partition number in previous zSeries).

Logical partition name

This name is user defined through HCD or the IOCP and is the partition name in the RESOURCE statement in the configuration definitions. The names must be unique across all LCSSs defined for the z990.

Figure 4-2summarizes all the identifiers and how they are defined, using a three LCSS configuration example.

Logical Partition Name			Logical Partition Name			Log Part	Logical		Specified in
						Name	Partition Name		HCD / IOCP
									HCD / IOCP
TST1	PROD1	PROD2	TST2	PROD3	PROD4	TST3	TST4	PROD5
Logical Partition ID			Logical Partition ID			Log Part	Logical		Specified in HMC
						ID	Partition ID		Specified in HMC
						ID	Partition ID		Image Profile
									Image Profile
02	04	0A	14	16	1D	22	35	3A
Logical Partition Number Logical Partition Number Log Part Logical Partition									Assigned by
									PR/SM at POR
						Number	Number
									Specified in
MIF ID	MIF ID	MIF ID	MIF ID	MIF ID	MIF ID	MIF ID	MIF ID	MIF ID	HCD / IOCP
MIF ID	MIF ID	MIF ID	MIF ID	MIF ID	MIF ID	MIF ID	MIF ID	MIF ID
2	4	A	4	6	D	2	5	A
									Specified in
									HCD / IOCP
	LCSS0			LCSS1		LCSS2	LCSS3

Figure 4-2 LCSS, Logical partition and identifiers

112IBM eServer zSeries 990 Technical Guide

990 specifications

The IBM 990 series, often referred to in the context of IBM's pioneering efforts in the realm of mainframe computing, represents a unique chapter in the history of information technology. Introduced in the late 1960s, the IBM 990 series was designed as a powerful tool for enterprise-level data processing and scientific calculations, showcasing the company's commitment to advancing computing capabilities.

One of the main features of the IBM 990 was its architecture, which was built to support a wide range of applications, from business processing to complex scientific computations. The system employed a 32-bit word length, which was advanced for its time, allowing for more flexible and efficient data handling. CPUs in the IBM 990 series supported multiple instructions per cycle, which contributed significantly to the overall efficiency and processing power of the machines.

The technology behind the IBM 990 was also notable for its use of solid-state technology. This provided a shift away from vacuum tube systems that were prevalent in earlier computing systems, enhancing the reliability and longevity of the hardware. The IBM 990 series utilized core memory, which was faster and more reliable than the magnetic drum memory systems that had been standard up to that point.

Another defining characteristic of the IBM 990 was its extensibility. Organizations could configure the machine to suit their specific needs by adding memory, storage, and peripheral devices as required. This modular approach facilitated the growth of systems alongside the technological and operational demands of the business environments they served.

In terms of software, the IBM 990 series was compatible with a variety of operating systems and programming environments, including FORTRAN and COBOL, enabling users to access a broader array of applications. This versatility was a significant advantage, making the IBM 990 an appealing choice for educational institutions, research facilities, and enterprises alike.

Moreover, the IBM 990 was engineered to support multiprocessing, which allowed multiple processes to run simultaneously, further increasing its effectiveness in tackling complex computing tasks.

In summary, the IBM 990 series represents a significant advancement in computing technology during the late 20th century. With a robust architecture, versatile configuration options, and a focus on solid-state technology, the IBM 990 facilitated substantial improvements in data processing capabilities, making it a cornerstone for many businesses and academic institutions of its time. Its impact can still be seen today in the continued evolution of mainframe computing.

IBM 990 manual Logical partition identifier, MIF Image ID Mifid, Logical partition name

Models: 990