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Dell PowerScale (Isilon) vs QoreStor comparison

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Comparison Buyer's Guide

Executive SummaryUpdated on Aug 19, 2025

Review summaries and opinions

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

Categories and Ranking

Pure Storage FlashBlade
Sponsored
Ranking in File and Object Storage
8th
Average Rating
8.8
Reviews Sentiment
7.8
Number of Reviews
38
Ranking in other categories
All-Flash Storage (15th), Software Defined Storage (SDS) (8th)
Dell PowerScale (Isilon)
Ranking in File and Object Storage
2nd
Average Rating
9.0
Reviews Sentiment
7.4
Number of Reviews
66
Ranking in other categories
NAS (2nd)
QoreStor
Ranking in File and Object Storage
22nd
Average Rating
8.2
Reviews Sentiment
7.3
Number of Reviews
9
Ranking in other categories
Backup and Recovery (51st), Data Replication (12th), Disk Based Backup Systems (7th), Storage Software (5th), Disaster Recovery (DR) Software (29th), Software Defined Storage (SDS) (23rd), Copy Data Management (6th)
 

Mindshare comparison

As of August 2025, in the File and Object Storage category, the mindshare of Pure Storage FlashBlade is 5.8%, down from 6.3% compared to the previous year. The mindshare of Dell PowerScale (Isilon) is 8.8%, up from 8.2% compared to the previous year. The mindshare of QoreStor is 0.1%. It is calculated based on PeerSpot user engagement data.
File and Object Storage
 

Featured Reviews

Eric Black - PeerSpot reviewer
The ability to leverage multi-tenancy along with immutability is a huge benefit for us
The only thing I feel FlashBlade is missing is the SOS API. If it had SOS API, that would put it well over the top. Veeam Backup specifically has started to streamline their API, and they are doing that with SOS API. They have optimized it. Any of the S3 devices out there that support this SOS API can have far more API calls at once. On our side, that translates to better restoration. With SOS API, it can leverage far more restorations at a single given time or read from the device in simple terms. That results in maximizing the output and throughput from the device itself.
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.
Jeff Manuszak - PeerSpot reviewer
Cost-efficient, highly scalable, and installable on different types of hardware
They could improve on support a little bit. We have not had to engage their support much, but when we do have issues, it can take longer to get things resolved. We are pretty lenient as we do a lot of IT support ourselves. We are not very hard on support organizations, but when a customer has a support issue, it would be easier if the support processes were a little bit more automated. It would be beneficial to have an easier way to upload diagnostic dump files. They can make it easy for the customer to collect the diagnostic data. There can be some kind of monitoring solutions to alert users to issues with the appliance or software, making it easy for customers to monitor their systems in the field. This is especially critical because it stores customers' backups, and a failure can have significant business impacts. If a customer does not have the backups and has a disaster, they can be out of business, so monitoring is key.

Quotes from Members

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

Pros

"Approximately 40% to 50% of my time is saved using Pure Storage FlashBlade compared to different products."
"The snapshots, replication, and the ability to have immutable blades are the most valuable features. You're putting data snapshots out in those blades, and they cannot be touched. Its performance is great."
"The most valuable features of FlashBlade include its replication capabilities, reports, and easy allocation. Everything is user-friendly."
"The most valuable feature of this solution is performance."
"It has also helped to simplify storage for us in the way that it's easy to manage. Their automatic monitoring really helps when things break or are about to break. They see a problem coming and alert us even before our own system does."
"I would rate Pure Storage FlashBlade a ten out of ten."
"We have integrated it with VMware. The integration process is pretty good. Especially with VMware, it helps with the capacity of it."
"Speed and ease of use are the two most valuable features."
"Dell PowerScale (Isilon) definitely deserves ten out of ten for scalability."
"The flexibility and the user-friendly interface are the most valuable features."
"Certainly, we have seen return on investment and peace of mind, especially with our two clusters that are linked together, where one is a disaster recovery solution for the other."
"Customer service is absolutely satisfying, rating at least nine out of ten, as they have managed previous issues well."
"I assess the stability and reliability of Dell PowerScale (Isilon) as perfect, as we haven't had any hiccups with it so far."
"The tool comes with cheap disks and works fast for video content."
"The most valuable features of the solution are flexibility and ease of implementation."
"The solution's most valuable features are scalability and flexibility."
"Data deduplication and replication would be the top two features. The encryption and cloud tiering are also attractive for the future."
"We need revisions and safe backup so that it could be held up in court, but deduplication and compression are the main features why we have Quest QoreStor. That's where it really shines. I use ZFS and XFS at home, and Quest QoreStor is even better."
"Deduplication is the most valuable feature. It saves us a lot of space. When we back up 100 terabytes of data, after dedupe, it only uses maybe five to six terabytes for the disk space in QoreStor."
"Quest QoreStor definitely saved us money."
"QoreStor has helped us to reduce our backup storage requirements on-premises. We've been using the same devices for quite a while, and so it lets us keep using them as opposed to having to rip out all that hardware and create a new on-prem solution. The advantage here is even if we had to retire the hardware tomorrow, the QoreStor part doesn't change. We just have to have additional hardware and put the solution back on whatever hardware we pick and it'll do the same thing."
"Quest QoreStor is very stable compared to our previous solution."
"I would rate QoreStor a ten out of ten for what it offers for the price."
"The dedupe and compression are pretty extreme. On disk, we're getting dedupe rates of up to 65 percent of data and compression of 34 percent. When you go to the cloud, it's more like 76 percent for dedupe and almost 50 percent for compression."
 

Cons

"Its configuration should be easier."
"The speed could be improved."
"There is some room for new features related to authentication and integration with Kubernetes, and other solution using S3 Bucket."
"The Pure Storage Orchestrator is our biggest pain point at the moment. If we can have more say in future developments of feature sets that we will need to support for our use case, that would be pretty beneficial to us."
"Compared to, for example, Hitachi NAS, the solution is not mature at all. It's just in its infancy as far as technology goes."
"Recently, while upgrading the version code, one of the controllers failed. Replacing the controller took between 14 to 20 days."
"The documentational aspect of FlashBlade needs improvement."
"The technical support needs to improve. When we open a case, it is auto assigned to a support tech person. Nine out of ten times, we get an email right back saying that person is off until tomorrow. I cannot handle that. They just did this over the weekend to us, too. I had to call our rep and have them do something about it."
"If they integrated some functions, as they have on Data Domain with a cyber recovery vault, it would be ideal."
"The price of the solution could be reduced."
"The solution can be integrated with an automation system. Dell uses another framework developed in-house. They can integrate it with machines."
"The hardest challenge we have is due to how we've bought things over time. The way that we moved to the PowerEdge platform for the newer systems creates a scale problem as I still buy the older style systems, which are more dense storage."
"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."
"Because of the magic that it does 'under the hood,' it is very difficult to find out within the system where all your storage is going. That's a little bit of a ding that we have on it. It does so much magic in order to protect itself from drive failures or multiple drive failures, that it automatically handles the provisioning and storage of your data. But by doing that, finding out why a file of a certain size, or a directory of a certain size, is using more storage than is being reported in InsightIQ, is very difficult to discern."
"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."
"I would want to see more AI features with Dell PowerScale (Isilon)."
"Support is one point of improvement for Quest QoreStor. Support is sometimes not adequate."
"There can be some kind of monitoring solutions to alert users to issues with the appliance or software, making it easy for customers to monitor their systems in the field."
"In terms of improvement, we would like to have an Air Gap feature to prevent a virus from attaching to something. So that when we don't do a backup, we want the QoreStor to stay offline. It would be a nice feature to have."
"The importance of support is significant to me. I was working for a service provider, and all of our customers had a Quest or warning. Sometimes the support really underperforms."
"Overall, I am happy with this solution, but a way to export configuration settings would be beneficial."
"The management interface is in need of improvement. The graphical user interface (GUI) for the web management tools appears clunky, and not super intuitive."
"The ransomware protection of QoreStor could use improvement."
"They could improve on support a little bit. We have not had to engage their support much, but when we do have issues, it can take longer to get things resolved."
 

Pricing and Cost Advice

"The product is very expensive."
"I have seen ROI. It has allowed me to increase the density of my VMs without having to purchase anything additional."
"We used a reseller for the purchase."
"I understand that it is competitively priced compared to other brands."
"In my opinion, we have paid the right price for the product. I don't think that it is too much or too little."
"The price of this solution could be made more affordable."
"The pricing for FlashBlade is between cheap and moderate."
"Pure Storage FlashBlade is a hardware appliance, and it's very expensive if you compare its price with other solutions. You can get the same features and benefits from its competitor, VAST Data, but for half the price of Pure Storage FlashBlade."
"Dell PowerScale is expensive on the start-up side but we can recoup those costs quickly by not having to reapply the savings to other equipment."
"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."
"The pricing is excellent."
"The only drawback for us is that it's a large upfront investment. This was a huge decision for a startup company to make. It took a bit for us to get over the line on it, but we have not regretted it."
"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."
"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."
"It is a really expensive solution."
"It is an expensive solution."
"The cost is per terabyte, and overall, the cost was reasonable when compared to some competitors."
"Quest QoreStor's pricing is affordable. We evaluated Veeam, a well-known company for backup solutions, but found their pricing to be quite high. Veeam's price was almost double. For us, Quest QoreStor is very affordable."
"Its pricing model is very attractive. You have one price, and you get everything from QoreStor."
"The pricing is good. It is competitive for a managed services provider. I like the ability to pay by the terabyte, allowing for an incremental cost that we and our customers can afford, so the solution grows with the customer."
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Top Industries

By visitors reading reviews
Computer Software Company
13%
Financial Services Firm
12%
Manufacturing Company
10%
Government
7%
Computer Software Company
13%
Manufacturing Company
11%
Financial Services Firm
9%
Healthcare Company
8%
Performing Arts
11%
Computer Software Company
9%
Manufacturing Company
8%
Educational Organization
7%
 

Company Size

By reviewers
Large Enterprise
Midsize Enterprise
Small Business
 

Questions from the Community

What do you like most about Pure Storage FlashBlade?
The tool's most valuable feature is its fast performance, especially in handling snapshots. It helps during power out...
What is your experience regarding pricing and costs for Pure Storage FlashBlade?
The pricing of Pure Storage FlashBlade is expensive compared to other products I used from other companies in the pas...
What needs improvement with Pure Storage FlashBlade?
I believe there is not much improvement needed because they have everything we need, but the interface is a little bi...
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...
What else besides data replication does QoreStor offer?
Quest QoreStor can be used for multiple things besides data replication. For example, it can be trusted to make a bac...
How does Quest QoreStore protect your data?
One of our favorite features of Quest QoreStore for data protection isn't the backup, actually, though we're using it...
How does Quest QoreStore solve repetitive data replicas?
When I first found out about data replication and the many benefits it had, I couldn't help but wonder - what about t...
 

Also Known As

No data available
PowerScale, Dell EMC Isilon
QoreStor
 

Overview

 

Sample Customers

ServiceNow, Mercedes-AMG Petronas Motorsport, Dominos, Man AHL
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,
American Airlines, at&t, Bank of America. Barclays, ebay, Ford
Find out what your peers are saying about Dell PowerScale (Isilon) vs. QoreStor and other solutions. Updated: July 2025.
865,484 professionals have used our research since 2012.