6947ch06.fm

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

D M=CHP(58)

IEE174I 17.00.35 DISPLAY M 263

 

CHPID 58: TYPE=1B, DESC=FICON

SWITCHED, ONLINE

DEVICE

STATUS FOR CHANNEL PATH

58

0

1 2 3 4 5 6 7 8

9 A B C D E F

022 +

023 +

098 .

+ +

SWITCH

DEVICE NUMBER = B000

 

DEFINED ENTRY SWITCH - LOGICAL

SWITCH ID = 03

ATTACHED ND = 006064.001.MCD.01.000000040012

PHYSICAL

CHANNEL ID = 034D

 

************************ SYMBOL EXPLANATIONS ************************

+

ONLINE

@ PATH NOT VALIDATED - OFFLINE

. DOES NOT EXIST

*

PHYSICALLY ONLINE

$ PATH NOT OPERATIONAL

 

IOS050I CHANNEL DETECTED ERROR ON dddd,yy,op,stat,PCHID=pppp

IOS051I INTERFACE TIMEOUT DETECTED ON dddd,yy,op,stat,PCHID=pppp

Figure 6-6 PCHID support for channel messages

EREP

The PCHID value associated with a particular CHPID is shown in the EREP Subchannel Logout record as can be seen in Figure 6-7.

DEVICE NUMBER:

0A02

REPORT:

SLH EDIT

 

DAY YEAR JOB

 

 

 

 

SCP:

VS 2 REL.

3

DATE: 258

02

DEVICE TYPE:

 

CACA

CPU MODEL:

2084

 

HH MM SS.TH

 

 

 

 

 

CHANNEL PATH ID:

3E

 

LOGICAL

CPU ID: 232920

TIME: 12 50 29.84

PHYSICAL CHAN ID: XXXX

PHYSICAL CPU ID: 612920

PHYSICAL CPU ADDRESS: 00

 

 

CC

CA

FL

CT

 

 

 

 

 

FAILING CCW

 

02 01DA2500 24 5000

 

VOLUME SERIAL

N/A

 

 

 

 

 

 

 

 

SUBCHANNEL ID NUMBER

000108B2

 

K

FLAGS

CA

US SS

CT

ERROR TYPE

 

OTHER

SCSW

64 C24017 01DA2318 00

02 5000

 

 

 

---UNIT STATUS----

SUB-CHANNEL STATUS

----------------SCSW FLAGS-----------------

 

 

 

 

 

 

 

 

FLAG 0

FLAG 1

FLAG 2

Figure 6-7 EREP support of PCHIDs

Extended Channel Measurement Block

The z990 processor supports the new Extended Channel Measurement Blocks. It also supports the original XA I/O architecture CMBs for compatibility reasons.

In z/OS with exploitation support, the ECMBs are placed in a system common area dataspace. You should, therefore, review the setting of the MAXCAD value in IEASYSxx. The CMB parameter in IEASYSxx is now redundant and will be ignored.

144IBM eServer zSeries 990 Technical Guide

Page 157 Page 159
Page 158
Image 158
IBM 990 manual Extended Channel Measurement Block, Switch ID =
Page 157 Page 159

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.
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