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Dell Unity XT vs IBM FlashSystem comparison

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Comparison Buyer's Guide

Executive SummaryUpdated on Sep 18, 2024

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
4.2
Dell Unity XT enhances performance, saves costs, and boosts efficiency with scalable, robust features yielding strong ROI for organizations.
Sentiment score
6.7
IBM FlashSystem offers easy migration, improved performance, seamless integration, cost efficiency, and quick ROI, enhancing user satisfaction.
By opting for the gold subscription every three years, you get a free upgrade to the latest controller release.
If you wait more than seven years to buy another one, you get a return on your investment.
The solution can comfortably be stretched from five to seven years without any failures, ensuring a long-lasting return.
We have seen return on investment compared to other OEMs, which took approximately three years after implementing IBM FlashSystem.
 

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
6.0
Dell Unity XT support is generally good, though some users face delays and difficulties with higher-level support access.
Sentiment score
7.0
IBM FlashSystem support reviews are mixed, with praise for response speed but criticism for regional expertise and complex escalations.
We also had one outage where a controller of one of the products had failed and had to be replaced on-site.
Customers always have their issues resolved promptly.
Pure has good storage.
The support team is familiar with the product and is available on-site during support times, which improves our experience.
Dell solutions are backed by excellent service and support.
The technical support sometimes takes three to four days to get hardware to facilities.
Customers of alternatives like Dell and Hitachi enjoy more reliable and comprehensive support services directly from vendors rather than third-party subsidiaries.
I rate the technical support from IBM as a ten.
IBM customer support is responsible, efficient, and responsive, though it is expensive.
 

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
7.8
Dell Unity XT is favored for its scalability and ease of upgrades, despite lacking high-end performance for some users.
Sentiment score
7.3
IBM FlashSystem is praised for its scalable, flexible expansion, suiting diverse enterprises and integrating well with current systems.
It is highly scalable.
It is suitable for both medium-sized and enterprise businesses.
It hasn't broken down anytime in the last six to seven years, despite hurricanes, earthquakes, and power outages.
Dell Unity XT is quite scalable and can be scaled up to the petabyte level.
For NetApp, we can recommend the FAS 8000 series.
For larger enterprises, scalability is an issue as the price becomes prohibitive.
The problem arises when migrating data to a later IBM FlashSystem version due to issues with firmware compatibility.
The scalability of IBM FlashSystem is exceptional, and I rate it as a nine.
 

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
8.5
Dell Unity XT is praised for stability, offering reliable performance and easy maintenance, with improvements post-initial bugs.
Sentiment score
7.6
IBM FlashSystem is generally stable and reliable; however, some users experience issues due to specific configurations or hardware conditions.
During the eight years, there have been no problems such as hardware failure or stopping.
I would rate the stability of the solution as a ten out of ten.
I would rate the stability of the product at seven out of ten.
I would rate the overall stability of Dell Unity XT an eight out of ten.
Customers have infrastructure that is 100% stable.
The firmware and software engine have fewer bugs, which enhances operational efficiency.
 

Room For Improvement

Pure FlashArray X requires cost-effective improvements in UI, integration, cloud features, multitenancy, analytics, backup, AI, and scalability.
Dell Unity XT needs improved deduplication, compression, integration features, support, affordability, and simplified management for enhanced user satisfaction.
IBM FlashSystem needs improvements in capacity, GUI, support, data reduction, cloud integration, and stability for better competitiveness.
We would appreciate a built-in transparent failover in the next release to eliminate the need for a separate metro cluster.
I'm eagerly anticipating the roadmap's promise of introducing multiple controllers, which could significantly boost scalability and resilience.
We mostly rely on long-term releases. We don't need the most up-to-date features, but we need a reliable environment.
In the future, if Dell storages include this option, especially for Unity, it would help us target SME or medium enterprises for quicker closures and support the sales team.
I believe if Dell can integrate AI to predict potential failures, especially in hardware like hard disks, that would be very useful for proper maintenance.
The pricing is a bit higher than expected.
Despite marketing promises, these features do not function effectively and can impact performance.
There is room for improvement in the troubleshooting part, specifically related to IBM Spectrum for Insight.
An additional function that could be helpful is reducing the time it takes to delete volumes, especially if they are compressed or deduplicated.
 

Setup Cost

Enterprise buyers see Pure FlashArray X NVMe as a justified premium investment due to performance and comprehensive licensing.
Dell Unity XT is competitively priced, offering robust features and support, suitable for mid-range budgets despite transparency concerns.
IBM FlashSystem pricing is competitive but can be higher; users stress evaluating total costs, including software and support.
While the prices may be higher than those of other vendors, we see it as a market leader with benefits.
The support can be a bit pricey, but the solution is more cost-effective than anything else out there.
I would give it a nine out of ten in terms of costliness.
It is priced at around or under $50,000.
The cost is not cheap nor expensive.
Commercially, Dell Unity XT is viable and competitively priced.
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.
 

Valuable Features

Pure FlashArray X NVMe offers exceptional performance, reliability, scalability, and seamless VMware integration, enhancing workload efficiency and user experience.
Dell Unity XT is praised for its simplicity, performance, reliability, scalability, and cost-effectiveness, ideal for mid-range companies.
IBM FlashSystem, known for high performance and reliability, excels in storage virtualization and advanced features, enhancing data efficiency.
Pure Storage has signature security technology, which cannot be deleted, even if you are an administrator.
The platform's robust features include excellent sustainability tracking, and a comprehensive dashboard offering insights into IOPS, bandwidth, performance, and virtual activities.
Its data compression feature is the best that we have ever seen.
It helps with data cost management and is seen as a mid-range product with good performance.
We installed the Flash, which makes our IO operations fast and efficient.
If their growth is not significant, we might suggest mid-level Unity storage like Unity 300.
There is a significant amount of data reduction, achieving a ratio of one to three.
There is built-in compression, a data reduction feature, and artificial intelligence-driven insights that calculate warnings and errors to redirect to customers automatically.
When integrated properly into the environment and configured according to the guidelines, it provides a very solid infrastructure that does the job on demand.
 

Categories and Ranking

Pure FlashArray X NVMe
Sponsored
Ranking in All-Flash Storage
14th
Average Rating
9.0
Reviews Sentiment
6.7
Number of Reviews
36
Ranking in other categories
NVMe All-Flash Storage Arrays (6th)
Dell Unity XT
Ranking in All-Flash Storage
6th
Average Rating
8.4
Reviews Sentiment
6.6
Number of Reviews
197
Ranking in other categories
No ranking in other categories
IBM FlashSystem
Ranking in All-Flash Storage
13th
Average Rating
8.2
Reviews Sentiment
6.9
Number of Reviews
112
Ranking in other categories
NAS (5th), Modular SAN (Storage Area Network) (2nd)
 

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 Dell Unity XT is 6.5%, down from 10.1% compared to the previous year. The mindshare of IBM FlashSystem is 6.5%, down from 6.7% compared to the previous year. It is calculated based on PeerSpot user engagement data.
All-Flash Storage
 

Q&A Highlights

Miriam Tover - PeerSpot reviewer
Aug 24, 2021
 

Featured Reviews

Jaehoon Oh - PeerSpot reviewer
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.
Syed Habib - PeerSpot reviewer
Efficient data replication and fast IOPS have improved operational performance
Dell and a partner jointly implemented this solution in Auvink. We installed the Flash, which makes our IO operations fast and efficient. Replication is available, allowing us to replicate data simultaneously from one site to another. All-flash technology and vTXT enhance speed, and the IOPS are faster. The cache's IOPS are much better. Snapshots provide a unique feature for testing and make management more comfortable and easy. The platform is multi-supported and certification is more convenient and easy to manage.
OmarIsmail1 - PeerSpot reviewer
Offers high performance and dependable support for fast storage needs
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.
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Answers from the Community

Miriam Tover - PeerSpot reviewer
Aug 24, 2021
Aug 24, 2021
EMC's Unity is not comparable to the performance of an IBM FlashSystem option, but it is fairly close in performance profile to the just released Storewize V5100 model 424. If you provide the initial amount of storage you are going to purchase and your expected capacity growth rate, plus any workoad/performance info you have on hand, and we will give you a very quick TCO and performance compar...
2 out of 5 answers
IB
Apr 17, 2019
For a performance comparison, I use a vendor-neutral benchmark portal like Storage Performance Council: For SPC-1: a) IBM storage, including All-Flash (performance) https://spcresults.org/benchmarks/results/top10/performance/spc1/1?field_peer_review_status_target_id=48&field_sponsor_target_id=18 b) Overall top 10 SPC-1 (performance) https://spcresults.org/benchmarks/results/top10/performance/spc1/1?field_peer_review_status_target_id=48&field_sponsor_target_id=18 c) Overall top 10 SPC-1 (price/performance) https://spcresults.org/benchmarks/results/top10/price/spc1/3 For SPC-2: a) Overall top 10 SPC-2 (performance) https://spcresults.org/benchmarks/results/top10/performance/spc2/1 b) Overall top 10 SPC-2 (price/performance) https://spcresults.org/benchmarks/results/top10/price/spc2/1 I also look at specific benchmarks from the vendors: a) IBM https://www.ibm.com/developerworks/community/blogs/InsideSystemStorage/entry/spc_benchmarks_for_disk_system?lang=en b) Dell EMC https://www.dellemc.com/resources/en-us/asset/white-papers/products/storage/h15161-dell_emc_unity-performance_metrics.pdf
it_user1000854 - PeerSpot reviewer
Apr 17, 2019
I am about to take delivery of a Unity 400 with SAS and have never considered an IBM hardware so i am not able to compare based on experience.
 

Top Industries

By visitors reading reviews
Computer Software Company
14%
Manufacturing Company
10%
Financial Services Firm
10%
Government
6%
Computer Software Company
17%
Manufacturing Company
11%
Government
7%
Financial Services Firm
6%
Computer Software Company
13%
Financial Services Firm
10%
Manufacturing Company
9%
Comms Service Provider
7%
 

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 is the Biggest Difference Between Dell EMC Unity and NetApp AFF?
I saw that you have doubts about what you chose. I have a lot of experience with the constructor, honestly I can reco...
What is the Biggest Difference Between Dell EMC Unity and NetApp AFF?
They’re both great solutions and I’ve used both. EMC is being VERY aggressive on pricing which may be the undoing of...
What is the Biggest Difference Between Dell EMC Unity and NetApp AFF?
First of all the decision should be taken looking at similar products in terms of capacity and performance. I will sh...
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/...
 

Also Known As

Pure FlashArray//X NVMe, Pure FlashArray//X, FlashArray//X
EMC Unity, Dell EMC Unity
IBM Storwize
 

Overview

 

Sample Customers

Fremont Bank, Judson ISD, The Nielsen Company
Draper, Rio Grande Pacific, Royal Victoria Regional Health Centre
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
Find out what your peers are saying about Dell Unity XT vs. IBM FlashSystem and other solutions. Updated: July 2025.
865,295 professionals have used our research since 2012.