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What is IBM Z?

IBM Z is the company's mainframe enterprise server solution product line.

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Recent Reviews

Honesty about IBM Z

6 out of 10
September 19, 2023
Our team create IaaS solution designs incorporating IBM Mainframe server, DS8000 storage technologies. The implemented IaaS solution used …
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IBM Z is the best among others

10 out of 10
January 02, 2023
Currently, the project we are working on in our team/company uses IBM servers, specifically IBM Z. This is also one of our customer's …
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Product Details

What is IBM Z?

The new IBM z15 delivers performance, flexibility, availability, protection, and agility to drive digital transformation. It has changed the footprint of IBM Z with a 19” frame, that scales from one to four frames depending on the configuration, enabling significant floor space reduction.

IBM z15 has the commercial data privacy and security enforcement solution, Data Privacy Passports, that provides off-platform access revocation. Choose who accesses data, and when and at what level to revoke their access. One hundred percent of data, at-rest and in-flight, is protected with no performance trade off or application changes. With Fibre Channel Endpoint Security working with the latest DS8900F, achieve total end-to-end protection and authentication.

IBM z15 provides flexibility, portability and choice for hybrid cloud deployment. Cloud-native development simplifies life for developers as they build new applications and modernize existing ones. IBM Z supports private and public cloud via Linux, Kubernetes and industry-standard tools. With the Red Hat OpenShift support, IBM z15 adds to the user's options for cloud integration.

Instant recovery reduces the impact of planned and unplanned downtime. All systems need downtime for maintenance, and security patching.

IBM Z Features

  • Supported: Data Privacy Passports
  • Supported: IBM Z Data Privacy for Diagnostics
  • Supported: IBM Recovery Boost
  • Supported: Integrated Accelerator for zEDC
  • Supported: Quantum-Safe digital signing algorithms

IBM Z Technical Details

Deployment TypesOn-premise
Operating SystemsLinux, z/OS, z/VSE, z/TPF, z/VM
Mobile ApplicationNo

IBM Z Downloadables

Frequently Asked Questions

IBM Z is the company's mainframe enterprise server solution product line.

Dell PowerEdge M and ClearPath Forward Libra are common alternatives for IBM Z.

Reviewers rate Support Rating highest, with a score of 9.4.

The most common users of IBM Z are from Enterprises (1,001+ employees).
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Reviews and Ratings


Attribute Ratings


(1-25 of 42)
Companies can't remove reviews or game the system. Here's why
Florian Schwanzara | TrustRadius Reviewer
Score 10 out of 10
Vetted Review
Verified User
Whenever a Business Application needs to run highly available, secure, and performant to a large number of users, it is just a perfect fit for IBM Z. The out of the box virtualisation capabilities are far beyond of any other platform and make even single systems highly available. That helps to reduce costs because we do not need to invest in software solutions to make it HA. And for sure, this makes the handling much easier.
  • Virtualization for Scale-Out and Scale-Up in the same footprint
  • Security for different workloads: Large Confidential Computing and lightweight Secure Execution
  • Performance is a true game changer: extreme throughput powered by amazingly huge caches.
  • The one and only FIPS 140-2 Level 4 HSM on this planet
  • Quantum Safe Encryption NOW!
  • AI infusion to every transaction
  • the amount of different pricing metrics is a inhibitor
  • the ease of use is really getting better - but still DPM is not available for all workloads
  • different pricing schemes for users vs. providers is a pain
Best suited for Linux consolidations, Oracle DBs, Blockchain Networks on a single box with extreme throughput (I tested a Ethereum Network, and it brought 4000 tx/s = that is amazing). Modernisation of old COBOL code with building new feature on in Containerised version and the same HW with HyperSockets or SMC-D is the best ultra low latency connection you can use. And with z16, now anything that uses AI models should run on IBM Z.
Ray Chabot | TrustRadius Reviewer
Score 9 out of 10
Vetted Review
Verified User
Platform solves virtually all major technical issues with low latency, dynamic scaling and spike/surge handling, and hot sparing of all critical components. Compatibility with both 20+ year old applications and the most modern tech all on one platform makes it a great career path as well.
  • High speed transaction handling with nearly guaranteed integrity
  • Specialty processors for offload of CPU intensive activities like crypto, java
  • Fast DR recovery with a single consistency group
  • All facilities for extremely tight security are available
  • The high centralization lowers environmental costs significantly
  • Low cost training/education platforms needed for small companies/individuals
If cost is not an issue, it is well suited to nearly any use excluding Windows only implementations.
Score 9 out of 10
Vetted Review
Verified User
I use IBM Z as the mainframe server framework, enabling enrichment with AI max productivity and statistical guidance.
  • Ai guidance
  • Innovation potentiation
  • Continuing being a leading game changer; industry is in motion
Anyone with a serious network looking for serious results should use IBM Z.
Sushil Arya | TrustRadius Reviewer
Score 9 out of 10
Vetted Review
Verified User
IBM Z is used for transaction processing for credit cards.So every real-time transaction is captured and validates the transaction and everyday processing is done on the whole portfolio as part of night Batch processing. New application are also boarded and regular real time service requests regarding the account are processed and response are sent.
  • Processing high tps in a shorter time.
  • Handled multiple users with same efficiency.
  • Minimum outage or downtime for real-time requests.
  • Batch processing execution is organized.
  • Batch optimisation.
  • Cost to company is high for IBM Z
  • Less resources available as per market demand.
Companies which have to process high volume of data is best suited to use IBM z for processing. Efficiency, integrity and performance is well maintained in the Z os so for large-scale data, IBM Z os is best suited. Whereas for companies that do not have the large volume to process, Z os is not suited because cost to company for using the Z os will effect the budget of company.
Judy L. Berglund | TrustRadius Reviewer
Score 10 out of 10
Vetted Review
Verified User
We current have IBM Z15 and are in the process of implementing IBM Z16. IBM Mainframes first and foremost provide not only the necessary uptime, fault tolerance, security, automation, high availability, etc. We currently utilize the IBM Z15 in a High Availability Scenario for many major applications. Utilizing one as primary and a secondary offsite at a secondary location. We also have the IBM Z carved out into LPAR's "Logical Partitions", which provide virtual environments for Test, Dev, etc. This is not new, LPAR's have been around for many many years on IBM mainframes, and another cool thing is we can create an LPAR and virtualize thousands of Servers in an isolated arena on the mainframe. We also use it has a test bed LPAR for AI along with Hybrid Cloud connectivity.
  • Fault Tolerance
  • High Availability
  • Totally Agnostic
  • Perform Large Scale Transaction Processing
  • Overall Cost - Mainframes are expensive but you get what you pay for
  • Software & Hardware Maintenance are pricey
  • Learning curve for employees. Many MF folks have retired or are looking to retire
In my opinion, IBM Z is extremely well suited for environments that run high levels of batch processing, online transactional processing such as CICS, interconnects to bridge multiple locations together and provide a single pane view of all locations, extremely fast, and Mainframes do not go down. In my experience, it is very uncommon for a Mainframe to just suddenly die, these boxes are not windows machines, very reliable.
September 19, 2023

Honesty about IBM Z

Score 6 out of 10
Vetted Review
Verified User
Our team create IaaS solution designs incorporating IBM Mainframe server, DS8000 storage technologies. The implemented IaaS solution used for host other commercial corporations Mainframe infrastructure. We also provide modernization service for aged deployments during the migration.
IBM Mainframes turned out are very reliable, secure and powerful computer systems. With proper pricing, their TCO can be really competitive compared with other systems.
On the downside, these are very archaic systems, very different mindset required for Mainframe operation than for any other more popular systems. Therefore very few people has proper knowledge, and finding / educating a workforce is challenging.
  • reliability
  • security
  • powerful computing capacity
  • cost
  • lack of educated operators
  • lack of free sandbox systems for education
IBM Z is well suited for existing Mainframe systems, where the migration cost to other architecture (money and time!) would be too high. And in that case if these systems require extending with additional functions for capacity. Meanwhile for green field deployments would makes much more sense to choose one of the other open systems, due to the much wider support personnel availability.
September 18, 2023

z/OS - nothing better

Gadi Ben-Avi | TrustRadius Reviewer
Score 10 out of 10
Vetted Review
Verified User
We have two computers at our production site and one at our DR site. All computers run z/OS. One system runs a payroll application, and the other runs a provident Fund Application. Both systems provide services to external customers. The computers are connected to an IBM DS9810F storage system and an IBM TS7770 virtual tape system.
  • Massive I/O
  • Support many users concurrently
  • Very little downtime required.
  • It's hard finding new people with the required knowledge.
  • It seems expensive.
Most business applications are suited to z/OS. It's no surprise that most banks and insurance companies worldwide run on z/OS.
September 12, 2023

Reliable and secured IBM Z

Score 9 out of 10
Vetted Review
Verified User
Mainly IBM Z's versatile platform addressed our wide array of business challenges

1. Deployed to cater to the needs of middleware applications.

2. Focused on the modernization of legacy IT systems which are crucial for business operations and user experiences.

3. Custom in-house applications specific to the Next-generation AI and data analytics

4. Deployed mainly focus on business applications that need robust Reliability and Availability.
  • Linux on Z applications can seamlessly operate on z/OS, which leverages z/OS operations staff and reuse the z/OS environment.
  • Primarily container images with s390x architecture in the Docker Hub can
  • be run in z/OS Container Extensions.
  • Kafka alongside with ZooKeeper API, benifits from the centralized service that maintains configuration information.
  • Unfortunately, there is no provision of morethan one one network interface in each virtual server instance of z/OS systems
  • As a limitation at resource sharing, mainly Disks are not able to share between z/OS virtual server instances
  • Compression is one of the key feature should be included to support in the PCIe
Its more appropriate for generative AI use cases wherein compute-intensive applications are hungry for CPU resources, and Z systems are more reliable and robust to a greater extent compared to traditional X36 or architectured Unix-based systems.

Even though Z systems cater to the needs of SMB users and businesses the penetration is not as expected in terms of price point compared to large scale Z systems.
September 10, 2023

Worth it product by IBM.

Score 10 out of 10
Vetted Review
Verified User
IBM Z is used in our organization for large data requirements as it is very versatile and has the capacity to store large amounts of data. We have freedom of choice with the type of data we store and there are scalability options that are inherent with this product from IBM.
  • Provided efficient storage for all the data needs.
  • Very versatile with old firmware as this has a hybrid open platform.
  • This has familiar dev tools for the developers which requires less turnaround time.
  • While migrating to cloud there is a slight disruption in network.
  • The User Interface can be improved which would make the product more intuitive.
  • Detailed documentation with the product guide related to migration will be much appreciated.
It is recommended when someone needs a reliable system with second to none downtime and has no major crashes, it is also suited for complex and large environments where there is a need for security which IBM Z provides. Sharing large amounts of data is also very easy without any data loss.
Score 8 out of 10
Vetted Review
Verified User
Support the mainframe networks (tcpip & SNA) for our company. User of TSO and infrastructure tools.
  • Large database management
  • Legacy support
  • Large scale API access to data
  • Modernizing the unix stack
  • Being more quick to market on application trends such as containers
Cost effective platform over larger time frames - write once run forever. Highly reliable. Relatively simple to manage for Disaster Recovery .
Sreehari Somasundaran | TrustRadius Reviewer
Score 9 out of 10
Vetted Review
Verified User
While my organization is an IBM Partner and we sell IBM Z to customers, we are a IBM Z user ourselves. Many of our internal workflow applications run on the mainframe platform and it has been supporting us for over a decade without having to take a downtime or even an upgrade. Reliability, Security and Scalability are the salient features of the platform. Getting it operational and forget it, it will run the company's business critical applications for you.
  • Availability - Runs non disruptively 24x7
  • Reliability - Never had to take an outage or unplanned downtime . Even it planned outage scenarios, it demonstrates high reliability, even though the platform is over a decade old now
  • Scalability - It runs at close to 100% utilization levels and never hangs or crashes
  • Security - Not even a single instance of it being hacked
  • IBM marketing of its capabilities need to improve
  • With such a great product, the industry perception is it being proprietary and expensive which needs to be clarified
  • Many applications are still not available on the platform to make it mainstream and much more is the perception
Well suited for mission critical and business critical applications. Customers who have unpredicted spikes in workload can rely on the mainframe as it will scale and even run at 100% utilization without crashing. Highest level of security and integrity. Ideal platform for datacenter in a box. So customers who are constrained on datacenter space requirements can look at this platform .Less Appropriate for customers who can run their requirement on Windows PCs and do not require high qualities of service of high security, reliability and availability
Score 10 out of 10
Vetted Review
Verified User
Currently, the project we are working on in our team/company uses IBM servers, specifically IBM Z. This is also one of our customer's requirements and we want to do everything on IBM Z servers. We handle it ourselves. Very helpful in terms of service support. We have been using it for almost 7 months. The overhead of running workloads and copying data has been reduced. Its AI is the main thing that makes the decisions made practically realistic and increases the efficiency of work. This is one of the best I've seen from IBM. This is really great. So far, we haven't had many issues and no incidents requiring fines. He is one of IBM's great products.
  • Usually it's fast when compared to other virtual power systems and low latency, hassle-free
  • Speed and availability
  • Effective and powerful
  • Delay and data retrieval
  • Connecticvity sometimes
Most of the time, server utilization is reliable and stable during peak times. Truly amazing, this product offers a lot and gets it done in no time without any confusion.It is reliable, too accurate and the performance is top-notch. It seems to be competitive in all virtual energy systems and its connectivity is also good. It's available at a low cost, but it's enough to have as many low-cost, more efficient systems as possible. It's a minor thing, but very rarely, it can cause work interruptions while it can get stuck due to more frequent use such as restless work. These power servers are very efficient and really help when things go wrong. I am using this product to retrieve data much faster.
November 30, 2022

Cloud at your premises

Gurkan Demircan | TrustRadius Reviewer
Score 10 out of 10
Vetted Review
Verified User
Reliable server which never fails, and has great disaster recovery offerings, is the definition of virtualisation, hence "the" cloud itself.

Yes, this is the mainframe, and yes, I am a mainframer.
  • Virtualisation
  • Total cost of ownership
  • Reliability
  • User interfaces
  • Customer education
  • Customer relations
When you need to run a huge number of transactions against big data, reliably, with the minimum total cost of ownership, the solution is the mainframe. If you can build a knowledgeable team around the mainframe, it rocks. Instead of running the serious workload on many, many, many small systems, which is hard to manage by all means of required SMEs, even Datacenter costs, just learn IBM Z and run your workload on the mainframe.
Score 8 out of 10
Vetted Review
Verified User
Ericsson (formerly Telcordia) provides IMS DB/TM-based inventory systems for very large phone companies. Although primarily IMS-based, we use IMS Connect, DB2, and MQ as well. We make extensive use of MQ and IMS Connect to allow access to our systems for users beyond just the 3270 world. We transformed all our 3270 green screens with our Xj (JAVA eXtensions) product so our users have the advantage of a modern interface. MQ is used to interface with both our other systems that run on other platforms (UNIX, LINUX, etc) as well as an interface to other phone company systems not written by Ericsson.
  • I/O is very fast in IMS and outside of IMS as well
  • CPU speeds are as fast as any other platform
  • User interfaces remain fairly constant (TSO, IMS, DB2, MQ, etc)
  • Support is good, but more examples, especially of non-Z/os things like JAVA, would be helpful
  • Security is becoming so prevalent it's cumbersome at times.
  • Less emphasis on exits coded in BAL/ASM and more parmlib/proclib members would be helpful
Large high-volume transaction-based systems run well on z/OS. Documentation is good, and support is very good when there is a problem, especially IMS support. IBM should allow many more functions to be offloaded to ziip/zaap than it currently allows. That might help stem the tide of folks wanting to abandon the platform. Allowing more base functions to ziip/zaap might also persuade managers that the platform is not expensive.
Score 9 out of 10
Vetted Review
Verified User
Core banking processing of billions of transactions and batch jobs each day to address all kinds of banking operations originating from different parts of the company. Thanks to IBM Z’s high availability features, the platform is the main backend for all mobile transactions that represent more than 80% of all of the bank's workload. Another key feature is security. IBM Z’s security features like RACF can build multiple levels of security, protecting all data and access!
  • High availability and resilience.
  • Security
  • Compatibility ( old code can run along new code with conflicts).
  • Cloud integration.
  • Business models.
  • Web interfaces.
IBM Z Is suited for environments that are mission-critical and have a high demand for back-end processing. There is no other platform that can handle huge amounts of workload and is secure and resilient like IBM Z. IBM Z should not be used by small companies or ones that deal with the very little workload. The platform is too expensive for processing small workloads.
Score 9 out of 10
Vetted Review
Verified User
It is trustable and grants high availability, which is very appropriate for managing different conversion processes like inventory and billing. Server trustability and can accumulate huge amounts of data. At first, it is challenging to learn, and we see that it is a high-priced platform; the command line interface should be upgraded, which makes it user-friendly and it is beneficial.
  • Its efficiency and performance, It is trustable.
  • IBM Z frame series mainframe system is like a skilled in the industry, protected, and it can do anything, almost distribute a lot of benefits in various sections.
  • It has an affinity with a lot of modern technology as well.
  • Difficult to learn at first.
  • high prices.
  • The Command line interface should be upgraded.
We found its Data processing marvelous, and its benefit to accomplish chores in time gives us high authenticity and availability to the data deposit with accelerated admittance. One thing I will say that try to make it more user-friendly as it is difficult to learn. We liked it overall; Working is very good.
Miley Erickson | TrustRadius Reviewer
Score 9 out of 10
Vetted Review
Verified User
IBM Z delivers on digital transformation, where it delivers high performance and perfect protection, among others, to increase the validity of the business functionality. Besides, IBM Z focuses on data privacy, where reputable security is deployed, and access measures are deployed for correct individuals. The program has excellent flexibility, which allows both on-premise and cloud usage, which increases the convenience of the users.
  • IBM Z has a perfect data privacy, which allows normal business functionality.
  • Besides, flexibility of the tool increases swift functionality in digital transformation.
  • Finally, the endpoint security is well articulated by IBM Z.
  • IBM Z has complexity issue, where it burdens new users.
  • IBM Z is pricey, and this challenges business users who are financially discouraged.
  • Finally, IBM Z has poor recovery measures, where data privacy can be a challenge.
IBM Z is the platform for advanced digital functionality, where different processes like data privacy are well managed. More so, IBM Z increases the value of the business performance, which allows different automation and business intelligence to be valid. The tool also allows the company to have a solid development of the appropriate applications to simplify the actual functionality. Finally, IBM Z has cloud integration, which increases business efficiency.
Vinay Damle | TrustRadius Reviewer
Score 9 out of 10
Vetted Review
Verified User
Used across various functions 1. To handle various billing transactions 2. To handle data storage and data warehousing analytics 3. To handle run various automated batch processing.
  • Very useful in handling different types of transactional processes like billing, inventory, etc.
  • Provides detailed data analytics when data is stored or data is warehoused.
  • Effectively used to run different types of data batch processing.
  • Initial integration difficulties can be improved.
  • Documentation can be drafted for migration strategy with some examples.
  • Lack of awareness of the tool can be improved by conducting webinars.
1. It is really well suited to handle critical business transactions of processes related to billing and data inventory. 2. Awesome for running batch processes to handles various reconciliation processes 3. Excellent for getting an idea about data analytics If you have legacy data storage or data warehousing applications then integration could be challenging.
Yasar Qamar | TrustRadius Reviewer
Score 10 out of 10
Vetted Review
Verified User
The IBM z/OS is being intensively used to run batch processes of enterprise-level applications for various in-house projects. We actively make use of a whole array of IBM z/OS middleware services ranging from DB2 relational database management systems to the CICS transaction processing servers. Additionally, various other suites of technology are interfaced with the z/OS for additional services access.
  • Batch processing.
  • Server reliability.
  • Legacy interface can be a bit hard to get around in the beginning.
  • Difficult to replicate work environment at home for practice.
For online processing like credit card transactions, it is the powerhouse of the world economy.
Other use case scenarios include using it as a relational database management system at the back end for companies like retail stores, insurance, and big volume financial banks.
Dana Rafiee | TrustRadius Reviewer
Score 9 out of 10
Vetted Review
Verified User
IBM Z is used across many functions of the organizations we support. It handles transactional processes such as billing, CRM, claims, and other types of data entry functions. In addition, it is used for advanced analytics when the data is stored in databases and data warehouses that support this style of processing. It is also an extremely secure platform as both Z and Z Linux are not standard targets for hackers. Even their design offers no single admin user ID. As Donna Dillenberger of IBM Research said in a recent presentation 'We know better'.
  • Transactional processing, including data entry across multiple departments
  • Reporting on massive amounts of data, due to its scale and size of processing capabilities
  • Analytics on data as there are various accelerators for both IBM's databases and others such as Oracle
  • Security is another major benefit to this platform as it contains a non-open systems design
  • It would be good if IBM could demonstrate more use cases for Z to potential clients
  • A migration strategy from Open Systems to Z would be helpful
  • Any additional marketing to could explain the benefits of Z/Linux, especially now that RedHat is in the mix.
IBM Z is well suited for large transactional environments with many input points, such as from computer terminals of an airline in the airports across the world. All of the banking scenarios, claims processing and other styles of environments would be perfect candidates. In addition, Oracle workloads are well suited for this platform, along with traditional DB2 and other Z based supported databases.
Kevin Littlejohn | TrustRadius Reviewer
Score 10 out of 10
Vetted Review
Verified User
IBM Z is used throughout the mainframe department. It addresses the availability, reliability and performance need for this ever-changing IT technology.
  • Reliability - the IBM Z platform is very reliable and can handle millions of transactions without suffering performance.
  • No comment
The IBM Z is well suited for platforms with high volumes of transactions. Most big banks use the mainframe (IBM Z) for their daily processes due to high demands for faster and quicker response time.
Score 10 out of 10
Vetted Review
Verified User
IBM Z is our enterprise system housing 90% of our data and does all of out back end processing. We execute 45 million CICS transactions and 24 million CICS transactions daily.
  • Reliable - We have an SLA with our customers of 99% availability
  • Scalable - IBM Z is the most scalable processors available. In January we had an unanticate 45% CICS transaction growth with on demand availablity we were quickly able to deal with this growth.
  • Data Sharing and SYSPlex across LPARS with DB2 and IMS accommodates multiple jobs requiring simultaneous access and updates
  • Improvements in CICS CPSM usability
  • Reduce the cost - it is a very expensive platform with costs that are very easy see
  • App dev improvements it is very difficult to implement lean processes on the platform
IBM Z is well suited for high volume applications that also require high availability. It would not be the best solution for environments that have a very low volume or a solution for very small companies.
Score 7 out of 10
Vetted Review
Verified User
IBM Z Mainframes are used to support z/OS and z/VM operating systems on a minute to minute basis.
These operating systems support critical applications and infrastructure to support front line business needs such as Claims Processing, Web Applications, DB2, CICS Transactions, and IMS Databases.
  • IBM Z Technology supports the critical Infrastructure needed for reliable Data Centers to support business needs.
  • IBM Z Mainframe Technology is used worldwide for the amount of MIPS (Millions of Instructions Per Second) and processing power/data handled by this equipment.
  • IBM Z Storage is Infrastructure that supports large amounts of critical data. (Direct Access Storage Devices, Virtual Tape Subsystems, and Physical back-end Tape)
  • More access methods from a Management GUI Interface to help support on-site IBM SSR's perform job duties. IBM SSR's log into one or more IBM TSSC's (Management Interface for IBM personnel) to support Support Infrastructure needs such as: enabling AOS, offline of a back-end TS11** tape drive or Downloading VTD Exec's which could be critical fixes released from support seen in the field.
  • More detailed/extensive lab testing before Ficon Host Adapters or ETH cards are released to new equipment sold in the field. We experienced multiple disruptive "Ficon Panics" within the recently purchased TS7760 Technology that had 16Gb Ficon cards behind a z14 mainframe with 16Gb Ficon cards. This turned out to be the following: shortage of data descriptors, block sizing, related to EEH or CAD code and we had an IBM TS7700 Architect come on-site and explain that a fix was made in the 8Gb Ficon cards that wasn't brought over into the 16GB Ficon cards. We've had to remove twenty 16Gb Ficon cards from seven TS7760's in our environment and replace with 8Gb Ficon cards until IBM Development release's VTD Exec's and CMVC fixes before another implementation plan.
IBM Mainframes are well suited for large claims processing customers as the IBM Z Mainframe technology processes extensive amounts of data so accurately and proficiently.
May 02, 2019

IBM Z - Nice

Score 10 out of 10
Vetted Review
Verified User
As a credit union, we use IBM Z for all online transactions and batch processing, including on-line web interface and mobile transactions.
  • On-line CICS transactions
  • Batch processing
  • More graphical user interface for newer Sysprogs
IBM Z is best suited for high volume, online transaction processing. It can securely handle massive amounts of data.
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