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Dell PowerScale (Isilon) vs NetApp FAS Series vs Qumulo 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 Qumulo is 6.5%, up from 6.1% 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.
VinceVitro - PeerSpot reviewer
Useful data sharing, simple cluster scaling, and excellent support
One aspect of Qumulo that I hoped to see improved was its software upgrade process, which did see significant progress during my usage. Initially, upgrading the software resulted in several minutes of system downtime. However, by the time I departed last summer, the downtime had reduced to mere ten seconds. Although I am unsure if Qumulo has yet achieved a completely outage-free upgrade, I simply performed the upgrades early in the morning before the marketing department began its workday, so any downtime was inconsequential.

Quotes from Members

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

Pros

"The fact that we were able to set it up, use it, and, for the most part, didn't have to worry about it after we had it set up has been valuable."
"PowerScale has made it extremely easy to scale file data across our organization. We have two implementations of Isilon. One is a replica of the other. When scaling, we add nodes to each location and expand the cluster. The process is straightforward."
"The most valuable feature of the solution is its performance."
"The reliability and stability of Dell PowerScale (Isilon) is good, with no downtime."
"We use the solution internally to support our own managed servers and run our own support center."
"For maximizing storage utilization, PowerScale is great. When you write the data to it, it spreads it out to all the nodes, so you get all the performance from the entire pool."
"The solution allows me to use SSMDS to store data for end users and share it within different locations."
"It has allowed us to have more consistent quality controls. It has also allowed us to expand the number of servers in clients processing and accessing data, allowing us to get a lot bigger projects out the door."
"The storage efficiency provided a maximum savings in our storage utilization."
"The file sharing feature is most valuable."
"NetApp FAS Series is simple to set up."
"The replication feature is noteworthy because it's faster than most and it uses little bandwidth. Then there's the friendly interface that the equipment offers. With this interface, it is very easy to manage."
"The SnapMirror is a good tool because, as long as you're going NetApp to NetApp, it's ultimately the fastest way to move data. We replicate everything to another site for disaster recovery."
"It's a stable product. No issues there."
"It changed the way we do Disaster Recovery (DR) around NetApp replication."
"The product is user-friendly and helps to evaluate the performance of each node. It ensures that if one node encounters an issue, the system can immediately redistribute the workload without interruptions. This setup provides uninterrupted operation for our systems."
"The ratio of total operational cost to complexity versus feature set is very good."
"The feature that I like most is the analytics part of the file system."
"The most valuable features of Qumulo are its rolling updates and all-day availability."
"The most valuable feature is real-time analytics."
"The most valuable features of Qumulo are the ease of management and special permissions that are quick to enable. The overall performance of the solution is good."
"It is a very stable product. I never faced any issues."
"The data protection algorithm to protect the data between the nodes has been the most valuable feature. The integration with backup platforms such as Veeam and Veritas has also been valuable."
"The most valuable feature of Qumulo is the ability to share files and reliability."
 

Cons

"The legacy file system for Epsilon didn't scale into the cloud and didn't have a separate OS. It would be key if this was made possible."
"Perhaps if there was a local chatbot built within the system or on the dashboard where we could directly ask for anything on the OneFS, it could help us."
"There are some missing features in the product, especially when our company needs to do some tape backup, and we see that the tool doesn't have integration capabilities."
"We're still fairly new with it. It's been a pretty positive experience thus far. However, they could improve implementation, as we had to rack and stack it ourselves."
"Dell PowerScale (Isilon) is a bit expensive compared to other products."
"The tool's support team and the way the cases are handled by the product's technical support team are both areas of concern where improvements are required."
"We lost our technical sales reps about two years ago. We haven't gotten one assigned to us and we'd love to have one."
"The cost of Dell PowerScale is currently high and there is room for improvement."
"The biggest issue we face is parts delivery. There's no local warehouse in Myanmar, so if a customer encounters a technical problem like an IMEI issue, they have to wait a long time for replacement parts."
"We have some experience with older equipment end-of-life. For example, when warranty support stops or updates stop – it can be frustrating. Not all clients can buy a new filer every year or two, and NetApp ending support a bit quickly can be a concern."
"Technical support needs to be improved, as there are no longer partners in our country."
"NetApp FAS Series should introduce an FTP application for the broadcast and post-production market."
"Interfacing with the cloud environment could be better. I want to be able to move some cloud volume and integrate it seamlessly with my home on-premise storage. Sometimes I have issues with port permissions. NetApp probably needs to improve more on the integration side from on-premise to the cloud."
"The adoption of flash by NetApp has also been lagging behind the trendsetters, like TMS, Nimble, and others."
"No other area for improvement comes to mind other than its price. Making the price more attractive will help this solution have a bigger market share."
"NetApp could improve costs while making the solution more straightforward to use and deploy."
"One aspect of Qumulo that I hoped to see improved was its software upgrade process, which did see significant progress during my usage. Initially, upgrading the software resulted in several minutes of system downtime. However, by the time I departed last summer, the downtime had reduced to mere ten seconds. Although I am unsure if Qumulo has yet achieved a completely outage-free upgrade, I simply performed the upgrades early in the morning before the marketing department began its workday, so any downtime was inconsequential."
"The support for iMac and protocols should be improved, not all features are available."
"The solution could improve availability and improve data protection or data services such as compression of deduplication. In a future release, we'd like to have more cloud API integrations."
"In the future, I would like to see non-disruptive updates."
"In the next release, I would like to see the ability to have more control at a terminal level of the file system."
"Qumulo should continue to expand automation and orchestration capabilities."
"Some anti-theft permissions do not transfer well to Qumulo."
"The price of the software is a bit expensive, so a reduction in cost would make it more competitive."
 

Pricing and Cost Advice

"Dealing with the product costs and licensing areas is getting easier since Dell is simplifying the licensing process and licensing packages offered to users."
"The price of Dell PowerScale (Isilon) is reasonable."
"It's a high-cost offering amounting to three or four million Swedish kronor, or about $400,000 or euros, for approximately 480 terabytes of storage."
"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."
"It is an expensive solution."
"It is a really expensive solution."
"Dell PowerScale is an expensive solution compared to other products like Qumulo."
"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."
"The solution’s cost is reasonable."
"When we need to implement a less expensive solution we use Huawei. NetApp FAS Series is a little bit expensive compared to the average of the market."
"I've sold arrays for as little $20,000 USD and as high as $300,000 USD."
"NetApp FAS Series' pricing is competitive."
"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 focus on storage only, which is really good; it works."
"It's not cheap, but at the same time, it's also inexpensive. It's somewhere in between."
"The product's pricing is reasonable."
"Low-priced product, but pricing could still be made more attractive."
"The price of the solution is in the middle range compared to others. We look at the price per terabyte."
"The price of Qumulo 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%
Computer Software Company
14%
Financial Services Firm
8%
Government
8%
Manufacturing Company
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)?
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
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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
County of Riverside Sheriff Department, Hyundai Mobis Automotive North America, University of Arizona, UCSD - San Diego Supercomputer Center, Medical College of Wisconsin, Sinclair Oil, Royal Dutch Shell, Kaiser Permanente, Deluxe Creative, Vexcel Imaging, University of Florida, The Madison Square Garden Company, Arizona State University, Cinesite, San Diego Padres Baseball, Johns Hopkins University - School of Medicine, IHME, EllieMae, Washington State University.
Find out what your peers are saying about Dell Technologies, NetApp, Hitachi Vantara and others in NAS. Updated: August 2025.
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