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Dell PowerScale (Isilon) vs NetApp FAS Series vs Panasas ActiveStor comparison

 

Comparison Buyer's Guide

Executive Summary

Review summaries and opinions

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

Mindshare comparison

As of August 2025, in the NAS category, the mindshare of Dell PowerScale (Isilon) is 17.5%, up from 17.5% compared to the previous year. The mindshare of NetApp FAS Series is 11.4%, down from 12.4% compared to the previous year. The mindshare of Panasas ActiveStor is 0.5%, down from 0.7% compared to the previous year. It is calculated based on PeerSpot user engagement data.
NAS
 

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.
MW
Easy to use and flexible with great performance
We primarily use the solution for our HPC projects, high-performance computing projects The product has proven itself to be stable. The performance is great.  We've found the product to be quite flexible. It is extremely easy to use.  The solution is quite expensive. The solution could offer…

Quotes from Members

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

Pros

"Since it can scale so easily, as long as I have money to buy more nodes, I can grow it as big as I need to. That is important in our business. As sequencing technologies continue to evolve, and as those technologies evolve, the amount of data generation never gets smaller. It just always seems to get bigger. This is one of the absolute key aspects: We can grow on demand without having to forklift stuff."
"There are also the policies that you set up on replication and purging files, and policies for something called WORM. That's a "write once, read many," where you can't overwrite certain files or certain data. It puts them in a "protected mode" where it becomes very difficult for someone to accidentally delete. We use that for certain files or certain directories, because we're dealing with video and some video has to be protected for chain-of-custody purposes. The WORM feature works great."
"The single pane of glass for both IT and for the end-user is a valuable feature. On the IT side, I can actually control where things are stored, whether something is stored on solid-state drives or spinning drives... The single pane of glass makes it very easy to use and very easy to understand. We started at 100 terabytes and we moved to 250 and it still feels like the exact same system and we're able to move data as needed."
"My experience with Dell as a vendor is pretty good; they are probably one of the best in the industry."
"On a scale of one to ten, with one being worst and ten being best, I would rate Dell PowerScale (Isilon) a ten."
"Dell PowerScale helps in saving costs related to power and rack space, reducing physical hardware from over one hundred to twenty-nine chassis."
"Customer service has been really good."
"The recent introduction of inline deduplication and compression has drastically improved our efficiency ratios to make it an economical product. This solution has also had a positive impact on our employees' productivity because it reduces the amount of admin that our staff needs to handle."
"Saves space with deduplication"
"The new FAS series is a good fit for some customers. We have good performance and capacity, even though it is full flash."
"I have found all the features useful in NetApp FAS Series."
"Can use both SAN and NAS at the same time."
"The tool's most valuable features are ease of use, ease of access, expandability, availability, and performance. NVMe drives have improved their performance."
"The most valuable features are compression and dedupe."
"It's a stable product. No issues there."
"One important feature for customers is its ease of use and continuity, enabling seamless usage across on-premise and cloud environments."
"We've found the product to be quite flexible."
"I am impressed with the tool's performance and bandwidth."
 

Cons

"We have issues in Brazil with the procurement of solutions because we have to check the entire market and justify the pricing to our audit institutions, making it difficult to keep with the same vendor."
"The solution can be integrated with an automation system. Dell uses another framework developed in-house. They can integrate it with machines."
"Data storage performance needs to be improved."
"The cost of Dell PowerScale is currently high and there is room for improvement."
"Dell PowerScale needs to reduce its price."
"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."
"We had some issues with level 1 support. We had to fight with them on repeated issues. There is room for improvement in level 1 support."
"The solution is expensive. It's quite expensive for the amount of storage we have."
"Needs to improve the adaptive storage quality of service."
"There is no NetApp infrastructure set up here in Greece."
"With scalability, we feel the system is limited."
"We're supposed to have used NetApp FAS Series for replication, but then one of the nodes failed, and then it's taken us some time to bring it up."
"There was a bug when creating new custom roles that automatically gave volume deletion permission, which was a problem, but they finally fixed it."
"The plan is to go with all SSDs and use MDM, rather than sticking with traditional disk drives. The goal is to have all SSDs for better maintenance speed, which is essential for applications that need to work."
"I think this kind of infrastructure is mostly obsolete. To keep up with developments in this space, you need to move all these features to an All-Flash solution."
"Installation of the additional switches and ETP could be improved."
"The solution is quite expensive."
"We have received complaints from customers that the tool is not easy to use. The tool's local technical service is slow. The solution is good for Linux customers and not for customers with other operating systems like Windows. The solution should provide storage without client software integration."
 

Pricing and Cost Advice

"Pricing for this solution is reasonable."
"The price of Dell PowerScale (Isilon) is reasonable."
"I always want things to be less expensive. However, I would say the pricing is fair. Their costs are in alignment with their competitors. It is a good value for the money."
"This solution is priced slightly higher than others on the market but does offer good quality. With this solution's data reduction and compression, we were able to purchase less. Costs have dropped because of the data rate of compression and deduplication."
"We use the TNA approach which is a great opportunity for us to better manage the licenses based on how much consumption is available for the different customers so we can use that approach and scalability."
"The pricing is excellent."
"The general cost for a system like this is expensive. The total cost depends on your use case. You need to pay for every additional feature that you use."
"The solution is expensive; it is not the cheapest solution out there. If you look at it from a total cost of ownership perspective, then it is a very compelling solution. However, if you're looking at just dollar per terabyte and not looking at the big picture, then you could be distracted by the price. It is not an amazing price, but it's pretty good. It is also very good when you consider the total cost of ownership and ease of management."
"it’s not an inexpensive solution and it may not be for the cost-sensitive customer."
"The NetApp FAS series price is very competitive compared to other solutions on the market it is a good choice."
"It’s difficult for us to get money, so make sure you get everything in order, because there’s no going back and saying “oh, I missed this or that”, so make sure you plan well and well in advance."
"The scalability is pretty good, but it's too expensive."
"NetApp FAS Series could be less expensive."
"It is expensive."
"NetApp FAS Series is a reasonably high-priced solution, partially because we select the configuration that duplicates the entire system."
"The solution is more expensive than other vendors."
"The solution's price is reasonable."
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Top Industries

By visitors reading reviews
Computer Software Company
13%
Manufacturing Company
11%
Financial Services Firm
9%
Healthcare Company
8%
Manufacturing Company
17%
Computer Software Company
14%
Financial Services Firm
8%
Government
6%
No data available
 

Company Size

By reviewers
Large Enterprise
Midsize Enterprise
Small Business
No data available
 

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)?
It's considered between mid and high-end regarding. Dell usually knows how to position each model. If the customer wa...
What needs improvement with Dell EMC PowerScale (Isilon)?
With every iteration of the OneFS system, new features are being added, and the UI is being updated here and there. S...
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 be...
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Also Known As

PowerScale, Dell EMC Isilon
No data available
ActiveStor
 

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
Advanced Mask Technology Center Airbus Argonne National Laboratory The University of Texas at Dallas School of Arts Technology and Emerging Communication Башнефть Boeing Bosch California Academy of Sciences Caltech Canon Case Western Reserve University Conoco Phillips Deluxe DirecTV Fairfield Technologies United States Federal Reserve Garvan Institute of Medical Research Goodyear Halliburton Harvard Medical School Honeywell In-Depth Geophysical Intel Kawasaki Lockheed Martin 3M Magseis Fairfield Mammal Studios The Man Group McLaren Mercedes-Benz MINES ParisTech NASA US Navy National Biodefense Analysis and Countermeasures Center NBCUniversal National Institutes of Health Nio National Oceanic and Atmospheric Administration Northrup Grumman Novartis Partners Healthcare Procter & Gamble PGS Pratt & Whitney Rutherford Appleton Lab Siemens Sim International Sinopec Solers Square Cnix TGS Toyota Motorsport GMBH Toppan Turner UMass Medical School United Technologies University of Georgia University of California Los Angeles University of Minnesota University of Notre Dame University of California San Diego Center for Microbiome Innovation Whiskytree
Find out what your peers are saying about Dell Technologies, NetApp, Hitachi Vantara and others in NAS. Updated: August 2025.
865,164 professionals have used our research since 2012.