IBM FlashSystem vs Nutanix Unified Storage (NUS) comparison

IBM FlashSystem vs. Nutanix Unified Storage (NUS)

July 2025

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Review summaries and opinions

We asked business professionals to review the solutions they use. Here are some excerpts of what they said:

ROI

Sentiment score

1.0

Organizations reduced costs and improved performance with Pure FlashArray X NVMe, achieving quick ROI and efficient resource management.

Sentiment score

6.7

IBM FlashSystem offers easy migration, improved performance, seamless integration, cost efficiency, and quick ROI, enhancing user satisfaction.

Sentiment score

6.9

Nutanix Unified Storage boosts ROI by cutting costs, enhancing efficiency, improving management, and strengthening data security for users.

By opting for the gold subscription every three years, you get a free upgrade to the latest controller release.

IT System Specialist - Operations & Infrastructure at Daman

If you wait more than seven years to buy another one, you get a return on your investment.

For more quotes and insights, download the Pure FlashArray X NVMe report

Sales Manager at Multicomputos PR

The solution can comfortably be stretched from five to seven years without any failures, ensuring a long-lasting return.

For more quotes and insights, download the IBM FlashSystem report

Infrastructure Technical Specialist II at Clicks Group

We have seen return on investment compared to other OEMs, which took approximately three years after implementing IBM FlashSystem.

Ravikumar Boppani

Technical Lead at Tomia

For me, the biggest return on investment when using this solution is that we do not have to have much support staff to run it.

Tom Hiles

Senior Manager, IT Infrastructure & Support at a tech services company with 501-1,000 employees

The scalability challenge with previous systems is lessened with Nutanix since we can expand by adding new hardware without needing migrations.

Ryan Salaheddine

Infrastructure Architect & Manager at a real estate/law firm with 201-500 employees

We are saving approximately 20% to 25% compared with the competition.

reviewer2703840

Global of Central Computing IT Operations Head at a retailer with 10,001+ employees

For more quotes and insights, download the Nutanix Unified Storage (NUS) report

Customer Service

Sentiment score

7.1

Pure FlashArray X NVMe's technical support is praised for responsiveness, despite occasional follow-up issues, earning high customer satisfaction.

Sentiment score

7.0

IBM FlashSystem support reviews are mixed, with praise for response speed but criticism for regional expertise and complex escalations.

Sentiment score

7.5

Nutanix Unified Storage support is responsive and knowledgeable, though complex issue resolution can occasionally face delays.

We also had one outage where a controller of one of the products had failed and had to be replaced on-site.

reviewer943512

System and Network administrator at Vodafone

Customers always have their issues resolved promptly.

For more quotes and insights, download the Pure FlashArray X NVMe report

Sales Manager at Multicomputos PR

Pure has good storage.

Gokhan Dikmen

Vice President of product at a tech services company with 51-200 employees

Customers of alternatives like Dell and Hitachi enjoy more reliable and comprehensive support services directly from vendors rather than third-party subsidiaries.

Vice President Sales at BELOCAL LTD

I rate the technical support from IBM as a ten.

Infrastructure Technical Specialist II at Clicks Group

IBM customer support is responsible, efficient, and responsive, though it is expensive.

For more quotes and insights, download the IBM FlashSystem report

Manager, Technical Services, IBM Storage & Backup Solutions. at Thakral

They come on the call, start troubleshooting immediately, and resolve issues effectively.

Ashish Savaratkar

Senior System Administrator at Datavail

They are very knowledgeable, and if they can't solve the problem, they find the answer within a day or so.

Shawn Greisen

Manager, System Engineering at a mining and metals company with 10,001+ employees

I would give the customer service and technical support a ten out of ten.

Manuel Heredia

PreSales at IKUSI

For more quotes and insights, download the Nutanix Unified Storage (NUS) report

Scalability Issues

Sentiment score

7.1

Pure FlashArray X NVMe offers scalable storage with low latency, easy upgrades, though capacity customization and high costs are noted.

Sentiment score

7.3

IBM FlashSystem is praised for its scalable, flexible expansion, suiting diverse enterprises and integrating well with current systems.

Sentiment score

7.8

Nutanix Unified Storage is highly scalable and flexible, allowing seamless expansion and integration without downtime, despite initial complexity.

It is highly scalable.

Joerg Utesch

Sales Director at systemzwo group

It is suitable for both medium-sized and enterprise businesses.

Jaka Demšar

VAD PLSM Storage - Slovenia & Croatia at ASBIS

It hasn't broken down anytime in the last six to seven years, despite hurricanes, earthquakes, and power outages.

For more quotes and insights, download the Pure FlashArray X NVMe report

Sales Manager at Multicomputos PR

For larger enterprises, scalability is an issue as the price becomes prohibitive.

Vice President Sales at BELOCAL LTD

The problem arises when migrating data to a later IBM FlashSystem version due to issues with firmware compatibility.

Manager, Technical Services, IBM Storage & Backup Solutions. at Thakral

The scalability of IBM FlashSystem is exceptional, and I rate it as a nine.

For more quotes and insights, download the IBM FlashSystem report

Infrastructure Technical Specialist II at Clicks Group

This means you don't have to buy everything upfront; you can buy what you need and add more as you grow, which is advantageous.

ChrisGeaghan

Sales engineer at HYCU, Inc.

These three components utilize scalability tools, enabling storage addition to nodes and supporting independent, linear performance growth.

Amarnath Charugundla

System Engineer at Tata Consultancy

I find the scalability of Nutanix Unified Storage (NUS) to be excellent, and I would rate it a ten based on my clients' requirements.

SaurabhShukla

Technical Lead at Cognizant

For more quotes and insights, download the Nutanix Unified Storage (NUS) report

Stability Issues

Sentiment score

8.1

Pure Storage offers exceptional stability and reliability with outstanding support, consistently achieving high user ratings for performance and service.

Sentiment score

7.6

IBM FlashSystem is generally stable and reliable; however, some users experience issues due to specific configurations or hardware conditions.

Sentiment score

8.0

Nutanix Unified Storage is praised for stability, high availability, and minimal disruptions, ensuring dependable performance and quick support resolution.

During the eight years, there have been no problems such as hardware failure or stopping.

Gokhan Dikmen

Vice President of product at a tech services company with 51-200 employees

I would rate the stability of the solution as a ten out of ten.

For more quotes and insights, download the Pure FlashArray X NVMe report

IT System Specialist - Operations & Infrastructure at Daman

I would rate the stability of the product at seven out of ten.

Gary Cheung

Project Manager at a government with 11-50 employees

Customers have infrastructure that is 100% stable.

Manager, Technical Services, IBM Storage & Backup Solutions. at Thakral

The firmware and software engine have fewer bugs, which enhances operational efficiency.

For more quotes and insights, download the IBM FlashSystem report

Infrastructure Technical Specialist II at Clicks Group

We have not experienced these issues with Nutanix, which I attribute to the all-flash technology, the quality of their platform, and the responsiveness of the hyper-converged infrastructure.

Ryan Adams

System Administrator II at a manufacturing company with 10,001+ employees

Nutanix Unified Storage (NUS) is very stable.

Ashish Savaratkar

Senior System Administrator at Datavail

It automatically triggers tasks, causing performance issues.

reviewer2700540

Nutanix Egineer with 10,001+ employees

For more quotes and insights, download the Nutanix Unified Storage (NUS) report

Room For Improvement

Pure FlashArray X requires cost-effective improvements in UI, integration, cloud features, multitenancy, analytics, backup, AI, and scalability.

IBM FlashSystem needs improvements in capacity, GUI, support, data reduction, cloud integration, and stability for better competitiveness.

Nutanix Unified Storage requires enhancements in implementation, analysis, technical support, FTP compatibility, management, integration, security, and usability.

We would appreciate a built-in transparent failover in the next release to eliminate the need for a separate metro cluster.

Joerg Utesch

Sales Director at systemzwo group

I'm eagerly anticipating the roadmap's promise of introducing multiple controllers, which could significantly boost scalability and resilience.

For more quotes and insights, download the Pure FlashArray X NVMe report

IT System Specialist - Operations & Infrastructure at Daman

We mostly rely on long-term releases. We don't need the most up-to-date features, but we need a reliable environment.

reviewer943512

System and Network administrator at Vodafone

Despite marketing promises, these features do not function effectively and can impact performance.

Vice President Sales at BELOCAL LTD

There is room for improvement in the troubleshooting part, specifically related to IBM Spectrum for Insight.

For more quotes and insights, download the IBM FlashSystem report

Manager, Technical Services, IBM Storage & Backup Solutions. at Thakral

An additional function that could be helpful is reducing the time it takes to delete volumes, especially if they are compressed or deduplicated.

Subodh Jaiswar

Storage Specialist at a computer software company with 1,001-5,000 employees

The main concern is pricing, which could deter some customers; addressing this would enhance its appeal.

Mrudula Oruganti

Senior Solution Software Engineer at Gigamon

The system should move towards AI-driven optimization and enhance S3 object storage capabilities.

Sukhwinder-Singh

Corporate Trainer at a educational organization with 501-1,000 employees

System downtime can disturb the entire ecosystem and impact all applications.

Amarnath Charugundla

System Engineer at Tata Consultancy

For more quotes and insights, download the Nutanix Unified Storage (NUS) report

Setup Cost

Enterprise buyers see Pure FlashArray X NVMe as a justified premium investment due to performance and comprehensive licensing.

IBM FlashSystem pricing is competitive but can be higher; users stress evaluating total costs, including software and support.

Nutanix Unified Storage offers competitive pricing, valued for features and ROI, but may be costly for smaller users.

While the prices may be higher than those of other vendors, we see it as a market leader with benefits.

Enes SUZER

Manager, System Infrastructure & Security at Organik Kimya San. ve Tic. A.S.

The support can be a bit pricey, but the solution is more cost-effective than anything else out there.

Sales Manager at Multicomputos PR

I would give it a nine out of ten in terms of costliness.

For more quotes and insights, download the Pure FlashArray X NVMe report

IT System Specialist - Operations & Infrastructure at Daman

To install or upgrade any software features, the cost is high, which makes it challenging for smaller companies who do not require advanced features like deduplication or compression typically needed by larger organizations.

For more quotes and insights, download the IBM FlashSystem report

Vice President Sales at BELOCAL LTD

Compared to buying three or four vendor solutions, it is much cheaper.

Tom Hiles

Senior Manager, IT Infrastructure & Support at a tech services company with 501-1,000 employees

The cost has doubled for the same amount of data, which was a challenge when presenting use case justifications for the increased cost.

Ryan Salaheddine

Infrastructure Architect & Manager at a real estate/law firm with 201-500 employees

Nutanix Unified Storage (NUS) has definitely helped reduce our total cost of ownership.

Nidhi Lnu

Information Technology Managed Services Provider at SCE

For more quotes and insights, download the Nutanix Unified Storage (NUS) report

Valuable Features

Pure FlashArray X NVMe offers exceptional performance, reliability, scalability, and seamless VMware integration, enhancing workload efficiency and user experience.

IBM FlashSystem, known for high performance and reliability, excels in storage virtualization and advanced features, enhancing data efficiency.

Nutanix Unified Storage delivers easy management, high availability, and integration with robust security and flexible storage options.

Pure Storage has signature security technology, which cannot be deleted, even if you are an administrator.

Gokhan Dikmen

Vice President of product at a tech services company with 51-200 employees

The platform's robust features include excellent sustainability tracking, and a comprehensive dashboard offering insights into IOPS, bandwidth, performance, and virtual activities.

IT System Specialist - Operations & Infrastructure at Daman

Its data compression feature is the best that we have ever seen.

For more quotes and insights, download the Pure FlashArray X NVMe report

Sales Manager at Multicomputos PR

There is a significant amount of data reduction, achieving a ratio of one to three.

Subodh Jaiswar

Storage Specialist at a computer software company with 1,001-5,000 employees

There is built-in compression, a data reduction feature, and artificial intelligence-driven insights that calculate warnings and errors to redirect to customers automatically.

Manager, Technical Services, IBM Storage & Backup Solutions. at Thakral

When integrated properly into the environment and configured according to the guidelines, it provides a very solid infrastructure that does the job on demand.

For more quotes and insights, download the IBM FlashSystem report

Infrastructure Technical Specialist II at Clicks Group

Nutanix Unified Storage (NUS) is appreciated for its fault tolerance and redundancy at the cluster level, which ensures reliable storage of files, folders, and other information accessible on the client side.

reviewer2700540

Nutanix Egineer with 10,001+ employees

The cybersecurity features of Nutanix Unified Storage (NUS) when dealing with unstructured data, such as ransomware threats, provide the ability to detect and back up block-based storage, allowing me to restore repositories or sets of block storage with one button click, which is automatic.

Andrew Essien

Network Engineer at Alabama A & M University

My experience with using Nutanix Unified Storage (NUS) for data-intensive workloads is that we have many SQL Servers and they perform much better than they did when we used hybrid converged previously.

Tom Hiles

Senior Manager, IT Infrastructure & Support at a tech services company with 501-1,000 employees

For more quotes and insights, download the Nutanix Unified Storage (NUS) report

Categories and Ranking

Pure FlashArray X NVMe

Mindshare comparison

As of August 2025, in the All-Flash Storage category, the mindshare of Pure FlashArray X NVMe is 0.9%, up from 0.8% compared to the previous year. The mindshare of IBM FlashSystem is 6.5%, down from 6.7% compared to the previous year. The mindshare of Nutanix Unified Storage (NUS) is 0.7%, up from 0.2% compared to the previous year. It is calculated based on PeerSpot user engagement data.

All-Flash Storage

Featured Reviews

Jaehoon Oh

Chief Technology Officer at Lambda256

Supports efficient storage management through volume snapshots and offers reliable non-disruptive upgrades

I have no specific improvements to suggest for Pure FlashArray X NVMe at this time. The performance statistics could be enhanced. I can see the performance statistics in the Pure Storage console, but it does not show the performance by 4K byte unit. It displays IOPS and bandwidth, but IOPS is about real use, and I want to know how many IOPS are currently running in 4K byte units. I cannot see that IOPS because most storage systems report their performance by 4K byte unit. I want to see Pure Storage performance by 4K byte unit to compare with other storage or other internal NVMe SSD.

Read full review

Offers high performance and dependable support for fast storage needs

Infrastructure Technical Specialist II at Clicks Group

The most valuable feature of IBM FlashSystem is its robust back code. When integrated properly into the environment and configured according to the guidelines, it provides a very solid infrastructure that does the job on demand. Additionally, IBM FlashSystem offers competitive pricing and reliable performance. The hardware is dependable, ensuring that it functions effectively when the setup is done correctly.

Read full review

Amarnath Charugundla

System Engineer at Tata Consultancy

Unified management and cost-effectiveness lead to positive experiences and future savings

Improvement is necessary wherein the memory or storage should not breach 90%, because if breached, it becomes unmanageable. We have to set alerts or CPU triggering for 95% for the first warning. Other activities on nodes or file systems should be properly maintained. We must monitor the dashboard for P1, P2 alerts in the Nutanix Unified Storage (NUS) file share system including SMB, NFS, objects, and blocks. Attention should be maintained for any alerts such as CPU, memory, and RAM alerts, as exceeding these creates issues within teams. If triggered to 95% and forgotten, it crosses the SLA breach, causing disturbances to application, web, and platform teams. Continuous monitoring on the Nutanix dashboard is essential. Even a highly experienced person in Nutanix Unified Storage (NUS) cannot provide a 10 rating out of 10 because it is a vast system. I would rate it eight from my perspective.

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Top Industries

By visitors reading reviews

Computer Software Company

14%

Manufacturing Company

10%

Financial Services Firm

10%

Government

Computer Software Company

13%

Financial Services Firm

10%

Manufacturing Company

Comms Service Provider

Computer Software Company

30%

Manufacturing Company

Educational Organization

Financial Services Firm

Company Size

By reviewers

Large Enterprise

Midsize Enterprise

Small Business

Questions from the Community

What do you like most about Pure FlashArray X NVMe?

Pure FlashArray X NVMe helps to improve our processing speed. It is user-friendly and easy to use.

What is your experience regarding pricing and costs for Pure FlashArray X NVMe?

The price of Pure FlashArray X NVMe is very expensive, though I do not know the actual price because I am using the E...

What needs improvement with Pure FlashArray X NVMe?

I have no specific improvements to suggest for Pure FlashArray X NVMe at this time. The performance statistics could ...

What do you like most about IBM FlashSystem?

It is simple to make an update.

What is your experience regarding pricing and costs for IBM FlashSystem?

Many factors affect purchasing directly from IBM, often involving a multi-step process. Customers, especially in bank...

What needs improvement with IBM FlashSystem?

The deduplication technology in IBM FlashSystem needs significant improvement. Other vendors like NetApp ( /products/...

What do you like most about Nutanix Unified Storage?

Nutanix has excellent product documentation available on their portals, written in simple, easy-to-understand language.

What is your experience regarding pricing and costs for Nutanix Unified Storage?

I have no idea about the pricing of Nutanix Unified Storage (NUS) as I'm not the decision authority for pricing. Gene...

What needs improvement with Nutanix Unified Storage?

While there are good aspects, I would like to see improvements in networking configuration, particularly regarding ov...

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Compared 7% of the time

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Product Reports

Download Pure FlashArray X NVMe product report

Pure FlashArray X NVMe

August 2025

Download IBM FlashSystem product report

IBM FlashSystem

August 2025

Nutanix Unified Storage (NUS)

August 2025

Download Nutanix Unified Storage (NUS) product report

Also Known As

Pure FlashArray//X NVMe, Pure FlashArray//X, FlashArray//X

IBM Storwize

Nutanix Files Storage, Nutanix Volumes Block Storage, Nutanix Objects Storage

Overview

Pure Storage FlashArray//X is the world’s first enterprise-class, all-NVMe flash storage array. It represents a new class of storage – shared accelerated storage, which is a term coined by Gartner – that delivers major breakthroughs in performance, simplicity, and consolidation.

Pure Storage

IBM FlashSystem products are enterprise computer data storage systems that store data on flash memory chips. Unlike storage systems that use standard solid-state drives, IBM FlashSystem products incorporate custom hardware based on technology from the 2012 acquisition of Texas Memory Systems. This hardware provides performance, reliability, and efficiency benefits versus competitive offerings.

IBM

Nutanix Unified Storage provides high availability and seamless cloud platform integration, ensuring robust redundancy, scalability, and streamlined management. It supports hybrid cloud connectivity, enhancing storage security and performance.

Nutanix Unified Storage is designed for effective data protection across block, file, and object storage, offering features like ransomware detection and a centralized management interface through Prism Central. Users gain improved SLAs and IT cost savings through its efficient performance. Despite its user-friendly interface, there is a demand for enhanced security measures such as Multi-Factor Authentication and DLP. While its resilience is notable, users seek improvements in protocol compatibility, storage capabilities, pricing, and support processes.

What are the most important features of Nutanix Unified Storage?

User-Friendly Interface: Simplifies storage management and monitoring.
High Availability: Ensures continuous operation and reliability.
Seamless Cloud Integration: Compatible with platforms like Azure and AWS.
Robust Redundancy: Protects data against hardware failures.
Scalable Architecture: Easily adapts to growing data storage needs.
Ransomware Detection: Enhances data protection measures.

What benefits and ROI might users find in reviews?

Improved SLAs: Increased service reliability and performance.
IT Cost Savings: Reduces expenses through efficient resource use.
Enhanced Security: Stronger data protection and reduced risk.
Centralized Management: Easier control and monitoring from one dashboard.

Industries implement Nutanix Unified Storage for tasks such as file storage, database performance improvement, and storage solution consolidation. Companies deploying virtual machines, securing against ransomware, connecting hybrid clouds, and backing up data find it useful. It supports workloads like Citrix VDI, Kubernetes, and research data, assisting many organizations migrating from legacy storage for better cost efficiency and reduced data center footprints.

Nutanix

Sample Customers

Fremont Bank, Judson ISD, The Nielsen Company

Celero, Friedhelm Loh Group, Clarks, Mingkang Natregro Health Food Group, Sofia, Etisalat Fights Fraud, UF Health Shands Hospital, Generali, Elecon Engineering Company Limited, Ventiv , Technology, CPFL Energia, Royal Caribbean Cruises Ltd., SciQuest, Coca-Cola Bottling Co. Consolidated, Paddy Power, Kelsey-Seybold Clinic, Interconnect Services, Severstal IP-Only AB, PVU Group GmbH

JetBlue, International Speedway Corporation, Volkswagen SAIC, Brighton and Hove City Council, Foresters Financial, Janus International Group, Cloud Comrade, Serco