1. Reliability : The system's hardware components have extensive self-checking and self-recovery capabilities. The system's software reliability is a result of extensive testing and ability to make quick updates for detected problems.
2. Availability : The system can recover from a failed component without impacting the rest of the running system. This term applies to hardware recovery and software recovery.
3. Serviceability : The system can determine why a failure occurred. This capability allows for the replacement of hardware and software elements while impacting as little of the operational system as possible. This term also implies well-defined units of replacement, either hardware or software.
A computer system is available when its applications are available. An available system is one that is reliable; that is, it rarely requires downtime for upgrades or repairs. And if the system is brought down by an error condition, it must be serviceable; that is, easy to fix within a relatively short period of time.
4. Security : One of the firm's most valuable resources is its data. Customer list, accounting data, employee information and so on. This critical data needs to be securely managed, controlled simultaneously made available to those users authorized to see it. The mainframe computer has extensive capabilities to simultaneously share, but still protect the firm's data among multiple users.
In an IT environment, data security is defined as protection against unauthorized access, transfer, modification or destruction, whether accidental or intentional.
5. Scalability : It has been said that the only constant is change. Nowhere is that statement more true than in the IT industry. In business positive results can often trigger a growth in IT infrastructure to cope with increased demand. The degree to which the IT organization can add capacity without disruption to normal business processes or without incurring excessive overhead is largely determined by the scalability of the particular computing platform.
By scalability, we mean the ability of the hardware, software, or a distributed system to continue to function well as it is changed in size or volume; for example, the ability to retain performance levels when adding processors, memory and storage. A scalable system can efficiently adapt to work, with larger or smaller networks performing tasks of varying complexity.
Mainframes exhibit scalability characteristics in both hardware and software, with the ability to run multiple copies of the operating system software as a single entity called system complex, or sysplex.
6. Continuing compatibility : Mainframe customers tend to have a very large financial investment in their applications and data. Some applications have been developed and refined over decades. Some applications were written many years ago, while others may have been written "yesterday". The ability of an application to work in the system or its ability.
The need to support applications of varying ages impose a strict compatibility demand on mainframe hardware and software. Applications must continue to work properly. Thus, much of the design work for new hardware and system software revolves around this compatibility requirement.
Any new design enhancements made to JCL must preserve compatibility with older jobs so that they can continue to run without modification. The desire compatibility with older jobs so that they can continue to run without modification. The desire and need for continuing compatibility is one of the defining characteristics of mainframe computing.
2. Availability : The system can recover from a failed component without impacting the rest of the running system. This term applies to hardware recovery and software recovery.
3. Serviceability : The system can determine why a failure occurred. This capability allows for the replacement of hardware and software elements while impacting as little of the operational system as possible. This term also implies well-defined units of replacement, either hardware or software.
A computer system is available when its applications are available. An available system is one that is reliable; that is, it rarely requires downtime for upgrades or repairs. And if the system is brought down by an error condition, it must be serviceable; that is, easy to fix within a relatively short period of time.
4. Security : One of the firm's most valuable resources is its data. Customer list, accounting data, employee information and so on. This critical data needs to be securely managed, controlled simultaneously made available to those users authorized to see it. The mainframe computer has extensive capabilities to simultaneously share, but still protect the firm's data among multiple users.
In an IT environment, data security is defined as protection against unauthorized access, transfer, modification or destruction, whether accidental or intentional.
5. Scalability : It has been said that the only constant is change. Nowhere is that statement more true than in the IT industry. In business positive results can often trigger a growth in IT infrastructure to cope with increased demand. The degree to which the IT organization can add capacity without disruption to normal business processes or without incurring excessive overhead is largely determined by the scalability of the particular computing platform.
By scalability, we mean the ability of the hardware, software, or a distributed system to continue to function well as it is changed in size or volume; for example, the ability to retain performance levels when adding processors, memory and storage. A scalable system can efficiently adapt to work, with larger or smaller networks performing tasks of varying complexity.
Mainframes exhibit scalability characteristics in both hardware and software, with the ability to run multiple copies of the operating system software as a single entity called system complex, or sysplex.
6. Continuing compatibility : Mainframe customers tend to have a very large financial investment in their applications and data. Some applications have been developed and refined over decades. Some applications were written many years ago, while others may have been written "yesterday". The ability of an application to work in the system or its ability.
The need to support applications of varying ages impose a strict compatibility demand on mainframe hardware and software. Applications must continue to work properly. Thus, much of the design work for new hardware and system software revolves around this compatibility requirement.
Any new design enhancements made to JCL must preserve compatibility with older jobs so that they can continue to run without modification. The desire compatibility with older jobs so that they can continue to run without modification. The desire and need for continuing compatibility is one of the defining characteristics of mainframe computing.
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