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Dell PowerScale (Isilon) vs NetApp FAS Series comparison

 

Comparison Buyer's Guide

Executive SummaryUpdated on Jul 27, 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
7.1
Dell PowerScale enhances management efficiency and scalability, improving storage performance, reducing costs, and delivering strong ROI and peace of mind.
Sentiment score
5.8
NetApp FAS Series offers strong ROI with VMware integration, reducing costs through efficiency, consolidation, and strong service value.
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
8.2
Dell PowerScale (Isilon) support is praised for expertise but criticized for first-line issues and occasional communication barriers.
Sentiment score
7.3
NetApp FAS Series' support is generally praised for knowledge and responsiveness, though some note variability in service quality.
Support online is definitely a ten out of ten.
Dell provides support within four hours, and they always fulfill their promises.
They have managed previous issues well.
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
7.4
Dell PowerScale offers scalable, flexible storage for growing enterprises, supporting seamless capacity expansion and stable performance with automatic tiering.
Sentiment score
7.4
NetApp FAS Series offers impressive scalability and efficient data handling, with considerations for cost and planning for expansion.
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.
We normally avoid current versions and use versions that have been running for at least two months in client usage before updating drivers.
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
8.1
Dell PowerScale is reliable and easy to manage, with high availability despite occasional support and load balancing issues.
Sentiment score
8.0
NetApp FAS Series is highly reliable with minimal downtime, praised for redundancy and continuous operation despite occasional issues.
Since we have good protection levels, the data is secured and replicated across the disks.
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.
When panic occurs on the node, it reboots itself, and we have experienced numerous hardware-related issues.
Most things are tailor-made, and we avoid downtimes even with primitive CLI commands.
 

Room For Improvement

Dell PowerScale is costly and lacks cloud integration, with usability, support, and management improvements needed for better user experience.
NetApp FAS Series needs better performance, integration, monitoring, pricing, usability, and support to enhance competitiveness and user experience.
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.
Storage companies should create encrypted storage solutions between the OS and storage to protect against ransomware attacks.
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.
 

Setup Cost

Dell PowerScale, though costly initially, provides valuable features, ease of management, and competitive pricing for business needs.
NetApp FAS Series is seen as high-cost but justified by features and performance, with negotiable pricing and discounts.
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 excels in scalability, performance, and security, offering efficient storage consolidation and resource optimization for organizations.
NetApp FAS Series provides reliable, flexible storage management with high availability, supporting SAN/NAS protocols and VMware integration for cost-effectiveness.
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.
Our IOPS are very high, reaching somewhere about 50k to 150k or 1.150k.
One important feature for customers is its ease of use and continuity, enabling seamless usage across on-premise and cloud environments.
 

Categories and Ranking

Dell PowerScale (Isilon)
Ranking in NAS
2nd
Average Rating
9.0
Reviews Sentiment
7.4
Number of Reviews
67
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
109
Ranking in other categories
Deduplication Software (3rd), Modular SAN (Storage Area Network) (1st)
 

Mindshare comparison

As of October 2025, in the NAS category, the mindshare of Dell PowerScale (Isilon) is 16.5%, down from 17.1% compared to the previous year. The mindshare of NetApp FAS Series is 10.7%, down from 12.2% compared to the previous year. It is calculated based on PeerSpot user engagement data.
NAS Market Share Distribution
ProductMarket Share (%)
Dell PowerScale (Isilon)16.5%
NetApp FAS Series10.7%
Other72.8%
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.
Srikanth Purushothaman - PeerSpot reviewer
Has supported long-term data protection and backup while requiring better part availability and pricing options
For monitoring purposes, we normally use flash access storage exclusively. We utilize a hybrid system because we need performance, combining NL-SAS for the volume and SAS flash to use as a fast cache system that provides more IOPS. We normally implement RAID 10, which we prefer over RAID 6's n plus 2 combinations. We utilize it for data redundancy, even with write intensity on. Regarding the unified storage architecture for NetApp FAS Series, we normally opt for exclusivity unless budget constraints exist. Our IOPS are very high, reaching somewhere about 50k to 150k or 1.150k. The high performance ensures minimal latency. An advantage we've seen with NetApp FAS Series is that snapshots provide very rapid backup and fast recovery. We basically use snapshots for data protection as first-level protection, with deduplication between the two storages serving as second-level protection.
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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%
Manufacturing Company
11%
Financial Services Firm
9%
Government
8%
Manufacturing Company
16%
Computer Software Company
13%
Financial Services Firm
9%
Government
6%
 

Company Size

By reviewers
Large Enterprise
Midsize Enterprise
Small Business
By reviewers
Company SizeCount
Small Business16
Midsize Enterprise17
Large Enterprise36
By reviewers
Company SizeCount
Small Business31
Midsize Enterprise37
Large Enterprise57
 

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)?
The cost is competitive with other vendors such as HP. I always compare prices between two vendors, and they are good in this situation.
What needs improvement with Dell EMC PowerScale (Isilon)?
Sometimes, it takes too long to set up everything. That's something I would want them to improve. The main challenge I face with it now is that my team is accustomed to using other vendors, and whe...
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: September 2025.
872,778 professionals have used our research since 2012.