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Dell PowerScale (Isilon) vs NetApp FAS Series comparison

 

Comparison Buyer's Guide

Executive SummaryUpdated on Apr 20, 2025

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
7.3
Dell PowerScale scales efficiently, consolidates workloads, and optimizes costs, enhancing data management and storage reliability across sectors.
Sentiment score
6.2
NetApp FAS Series offers efficient storage, cost savings, and satisfaction, especially in VMware environments, despite high expansion costs.
Despite being more expensive than Huawei, it is stable and most enterprises accept the price due to its stability.
In terms of Dell PowerScale (Isilon) specifically, we have seen a return on investment due to faster performance than our last few storage arrays, and the general usability is a lot better.
The second cluster of Dell PowerScale (Isilon) gives us flexibility for small things like code upgrades, all the way to scenarios where we have lost this data center or data, allowing us to check if data is still intact on the other side.
If you have the configuration well maintained and configured, you should have good efficiency and compression for the clients and for yourself.
 

Customer Service

Sentiment score
8.4
Dell PowerScale support is helpful yet inconsistent; higher-tier engineers excel, but COVID-19 strains first-line support response.
Sentiment score
7.3
NetApp FAS Series customer service is responsive and knowledgeable, though regional availability and resolution streamlining can improve.
Dell provides support within four hours, and they always fulfill their promises.
They have managed previous issues well.
I would evaluate the customer service and technical support for Dell PowerScale (Isilon) as great.
Sometimes, the support was inadequate because the initial architecture was poorly defined.
We are also using it ourselves for the SAN and CIFS protocol.
They often provide basic solutions, such as suggesting a failover or a power cycle, which are not the sophisticated solutions we expect from a vendor.
 

Scalability Issues

Sentiment score
7.8
Dell PowerScale excels in scalability and integration, managing large workloads efficiently while offering flexible storage solutions for enterprises.
Sentiment score
7.4
NetApp FAS Series offers seamless scalability, integrating old and new components for medium to large enterprises despite potential cost issues.
We started on PowerScale with around about 300 terabytes and are now two and a half petabytes, still on the same file system.
That's really saved us in certain areas as we didn't have funding to expand Dell PowerScale (Isilon) until next year, which is why we utilized the cloud pools functionality to offload.
Dell PowerScale is highly scalable, as evidenced by the reduced physical hardware and the efficient use of rack space.
NetApp FAS Series is scalable, and it is possible, but you need to pay.
The NetApp FAS Series is scalable and offers numerous solutions, but only if customers are willing to invest in the shelves.
 

Stability Issues

Sentiment score
8.3
Dell PowerScale (Isilon) offers reliable, stable performance with minimal downtime and resilience against unexpected issues, despite minor setup challenges.
Sentiment score
8.0
The NetApp FAS Series is praised for stability and reliability, with users noting minimal issues and high performance.
I assess the stability and reliability of Dell PowerScale (Isilon) as perfect.
I find the product to be resilient and stable. There's no downtime and no crashes.
I find Dell PowerScale (Isilon) to be very stable and reliable.
When panic occurs on the node, it reboots itself, and we have experienced numerous hardware-related issues.
 

Room For Improvement

Dell PowerScale could improve with better cloud integration, simpler configuration, enhanced data management, security, and performance, especially for small files.
NetApp FAS Series needs enhancements in flexibility, pricing, integration, performance, documentation, support, virtualization, and scalability to address user concerns.
Hardware failures under warranty should be addressed within the promised timeline.
I would want to see more AI features with Dell PowerScale (Isilon).
If I could improve one thing on Dell PowerScale (Isilon), it would be better object storage as it recently breached into S3, and that capability could be broadened.
Nutanix leads the business in this approach, and I feel that NetApp is missing some aspects, such as CPU, GPU, and RAM, in its AI portfolio.
There is an opportunity there for NetApp with Cloud Volumes ONTAP.
It was not possible to have a custom user inside ONTAP without the delete permission to delete the volume.
 

Setup Cost

Dell PowerScale is pricey but offers value in total cost, scalability, and performance, making it a worthwhile investment.
NetApp FAS Series is pricey but offers good ROI and savings through bundled licensing, with support impacting overall costs.
It's quite expensive for the amount of storage we have.
My experience with pricing, setup costs, and licensing for Dell PowerScale (Isilon) shows it's a premium platform, so it's a big amount of money.
The pricing is excellent.
The pricing of NetApp FAS Series is not cheap, but in comparison to other vendors, NetApp FAS Series is affordable.
 

Valuable Features

Dell PowerScale offers easy management, scalability, strong data protection, integration, and supports diverse workloads with high reliability.
NetApp FAS Series excels in high availability, integration, and efficient storage solutions, featuring robust disaster recovery and unified storage.
Dell PowerScale offers high scalability and stability as well, making it a valuable solution for enterprises.
In our AI initiatives, Dell PowerScale (Isilon) plays a significant role in data analysis, data fusion; principally, it is involved in data analysis, data extraction, and statistical analysis.
Single files are limited to four terabytes in our configuration, however, the system can support up to 16 terabytes, so we can scale based on that too.
While NVMe disks are expensive and require three disks for parity calculations, hard drives in NetApp FAS Series are inexpensive, making it more cost-efficient per GB, even with RAID tech implementation.
One important feature for customers is its ease of use and continuity, enabling seamless usage across on-premise and cloud environments.
At this moment, autonomous ransomware protection is the key feature.
 

Categories and Ranking

Dell PowerScale (Isilon)
Ranking in NAS
2nd
Average Rating
9.0
Reviews Sentiment
7.5
Number of Reviews
65
Ranking in other categories
File and Object Storage (3rd)
NetApp FAS Series
Ranking in NAS
3rd
Average Rating
8.8
Reviews Sentiment
7.1
Number of Reviews
108
Ranking in other categories
Deduplication Software (3rd), Modular SAN (Storage Area Network) (1st)
 

Mindshare comparison

As of July 2025, in the NAS category, the mindshare of Dell PowerScale (Isilon) is 17.7%, up from 17.3% compared to the previous year. The mindshare of NetApp FAS Series is 11.5%, down from 12.3% compared to the previous year. It is calculated based on PeerSpot user engagement data.
NAS
 

Q&A Highlights

AV
Mar 12, 2020
 

Featured Reviews

Scott Taylor - PeerSpot reviewer
Manages large data sets efficiently with hybrid cloud integration
My organization is quite large, with about 30,000 employees. The growth has been substantial in areas such as radiology and genomics. One of the best features we've utilized recently is offload to cloud pools due to capacity constraints on-premise. We didn't want to expand Dell PowerScale (Isilon) straight away, so we utilized cloud pools to offload some data to Azure. That's really saved us in certain areas as we didn't have funding to expand Dell PowerScale (Isilon) until next year, which is why we utilized the cloud pools functionality to offload.
Arnaud Salmon - PeerSpot reviewer
Offers good performance and
Once, I've been in a program, but they stopped supporting protocols like HTTP, STP, and that kind of stuff. All of the DIP supports at the beginning were kind of support when it was just Python and just five storage. And it happened a few times that the customer required the STP and HTTP protocol for storage. And I was surprised I couldn't do it anymore with NetApp. So, it would be beneficial for them to support both kinds of protocols. The only little black points that I would put on top of NetApp FAS Series. There is room for improvement in deployment and configuration processes. The thing with ONTAP is that we have a lot of layers, from the raw disks to the volumes we present to servers and configure. There are quite a lot of things to configure. Probably NetApp should ease the way to install that. In NetApp products, such as ONTAP and FAS, a solid understanding of storage is still necessary to handle configurations in larger systems. It's not the same with Pure Storage or Huawei. Even someone less familiar with storage could manage it, making it more accessible.
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Answers from the Community

AV
Mar 12, 2020
Mar 12, 2020
Isilon is Scale-out storage, while NetApp is Active-Standby storage. Regarding the performance issue based on the field engineer’s experience, Isilon is better than NetApp in case of a huge amount of io, while NetApp is better than Isilon in case of a medium amount of IO.
2 out of 3 answers
BH
Mar 9, 2020
My recommendation is to take a close look at our CS Concerto Scale-Out Cluster system.
SK
Mar 10, 2020
Isilon is Scale-out storage, while NetApp is Active-Standby storage. Regarding the performance issue based on the field engineer’s experience, Isilon is better than NetApp in case of a huge amount of io, while NetApp is better than Isilon in case of a medium amount of IO.
 

Top Industries

By visitors reading reviews
Computer Software Company
13%
Educational Organization
10%
Manufacturing Company
9%
Financial Services Firm
9%
Educational Organization
26%
Manufacturing Company
13%
Computer Software Company
11%
Financial Services Firm
7%
 

Company Size

By reviewers
Large Enterprise
Midsize Enterprise
Small Business
 

Questions from the Community

What do you like most about Dell EMC PowerScale (Isilon)?
The solution provides massive performance, scalability, efficiency, and ease of management.
What is your experience regarding pricing and costs for Dell EMC PowerScale (Isilon)?
We have to go through a certified reseller for Dell PowerScale (Isilon). From a value standpoint, it performs very well.
What needs improvement with Dell EMC PowerScale (Isilon)?
I would make Dell PowerScale (Isilon) better by improving SmartSync in the graphical user interface. Currently, everything has to be done through the command line, and I prefer having a graphical i...
Which SAN product would you choose: IBM FlashSystem (FS9500) vs PureFlash Array/X NVMe vs PureFlash Array/XL NVMe?
Have you considered a NetApp FAS Storage for your NAS needs? I am sure it fits very well.
What is your experience regarding pricing and costs for NetApp FAS Series?
The pricing of NetApp FAS Series is not cheap, but in comparison to other vendors, NetApp FAS Series is affordable because they also have deduplication, compression, and inline compression. They fo...
 

Also Known As

PowerScale, Dell EMC Isilon
No data available
 

Overview

 

Sample Customers

OMRF, University of Utah, Translational Genetics Research Institute, Arcis, Geofizyka Torumn, Cyprus E&P Corporation, Colburn School, Columbia Sportswear, Harvard Medical School, University of Michigan, National Library of France,
Children's Hospital Central California, Plex Systems, PDF PNI Digital Media, Denver Broncos, PDF KSM Legal, Clayton Companies, Virginia Community College
Find out what your peers are saying about Dell PowerScale (Isilon) vs. NetApp FAS Series and other solutions. Updated: June 2025.
859,957 professionals have used our research since 2012.