Tape Is Back. Now Choose Your S3 Gateway Wisely — Before You Get Locked In.

The IBM Diamondback, Spectra Logic Cube, Quantum Scalar i7 RAPTOR, and BDT Orion are a genuine breakthrough — forty to sixty petabytes of LTO-10 native capacity in a single rack, customer-serviceable, no specialized infrastructure required. Tape is back, and these libraries are the reason why.

Running alongside the new hardware is a new class of S3-to-tape gateways — IBM Deep Archive, Spectra BlackPearl, and Quantum ActiveScale Cold Storage — that let any application write to tape through a standard S3 interface. The simplicity pitch is legitimate. Just make sure you don’t accidentally hand your data over to the vendor who sold you the hardware.

This article covers how the new libraries compare, why the bundled gateways create lock-in that lasts the entire multi-decade life of your archive, and why a hardware-agnostic alternative like Versity ScoutAM is the smarter architectural choice.

The New Rack-Modular Tape Libraries: IBM Diamondback, Spectra Cube, Quantum Scalar i7 RAPTOR, and BDT Orion

For years, the conventional wisdom was that tape was a legacy technology in managed decline — too slow, too complex, too hard to justify. That narrative is now demonstrably wrong, and the new generation of rack-modular tape libraries is a big part of why.

What is a rack-modular tape library? It is exactly what it sounds like: a fully self-contained tape library that fits in a standard data center rack, uses field-replaceable components, and can be deployed and expanded without specialized infrastructure. That last point matters more than it might seem. Traditional enterprise tape libraries — think the IBM TS4500 or the Spectra TFinity — were impressive machines, but they were also imposing ones. They required dedicated floor space, custom installation, and ongoing vendor involvement for maintenance. They were designed for large, mature tape operations with dedicated staff.

The new rack-modular designs are different. They were initially conceived as a response to hyperscale operators who needed massive tape capacity but wanted datacenter simplicity. The result is a product class that has rapidly overshot its original target market and is now displacing the traditional large-footprint libraries across a wide range of deployments.

What Each Vendor Has Built

IBM Diamondback is probably the highest-profile product in this class. A single full rack holds over 46.4 PB of native LTO10 capacity. It deploys in under 30 minutes, is 99% customer-serviceable. It is fast, dense, and operationally simple.

Spectra Logic Cube holds approximately 50 PB of LTO-10 native capacity with up to 1,670 slots and 16 full-height tape drives. It can be scaled and reconfigured via software without downtime and without special tools. The Cube supports up to 16 partitions for multi-tenant environments and includes Spectra’s new and impressive LumOS management software. Like the Diamondback, it is engineered for simple datacenter deployment in a standalone frame roughly equivalent to a standard rack.

BDT Orion rounds out the category as another rack-modular option gaining traction, particularly in European markets, with a similar emphasis on datacenter-friendly form factors and modular scalability. The Orion fits in a standard 19” rack and holds approximately 42 PB of native LTO-10 capacity. 

Quantum Scalar i7 RAPTOR Quantum claims the Scalar i7 RAPTOR delivers up to 60 PB of LTO-10 native capacity in a single rack — making it the densest tape library currently on the market. All serviceable components are customer-replaceable in under five minutes. The RAPTOR is unambiguously designed for hyperscale and enterprise-class archive workloads.

The common thread across all of these products is that they represent a real step forward. The density numbers are, as one analyst put it, “almost shockingly high.” Forty to sixty petabytes of native LTO-10 capacity in a single rack that fits in your existing datacenter is not a marginal improvement — it is a category shift. Combined with field-replaceable components, software-driven management, and significantly lower acquisition and maintenance costs compared to traditional large libraries, these products are genuinely changing the economics of long-term archival storage.

Tape is back. These libraries are excellent. You should absolutely evaluate them.

What Is an S3-to-Tape Gateway? How IBM Deep Archive, Spectra BlackPearl, and Quantum ActiveScale Cold Storage Work

Running in parallel with the new hardware is a software trend that deserves equal attention: the emergence of S3-to-tape gateways. The concept is sound. The S3 API has become the lingua franca of object storage. If you can present a tape archive as an S3 endpoint, any application that speaks S3 — and today virtually all of them do — can write to tape without modification. S3 GET and PUT become the interface to archival storage. This opens up tape to a vastly larger set of use cases: AI training data sets, scientific archives, media preservation, regulatory retention, backup targets, cloud repatriation, and more.

The three dominant bundled gateway products:

IBM Deep Archive presents an S3 Glacier-compatible interface directly from the Diamondback library. An x86 server added to the Diamondback frame manages the S3 interface and the object-to-tape cartridge mapping catalog.

Spectra Logic BlackPearl has offered S3-to-tape for several years and integrates tightly with the Spectra Cube and TFinity libraries. BlackPearl uses disk as a write buffer (caching incoming writes and flushing to tape as pages approach 100 GB), provides a DS3 object interface (an S3 extension), and manages metadata and catalog internally.

Quantum ActiveScale pairs with the Scalar i7 RAPTOR to deliver a similar on-premises S3 Glacier-class experience, but with a much heavier object storage tier in the middle.

These are real products solving a real problem. The simplicity pitch is legitimate: stop worrying about tape media management, drive interfaces, and HSM software complexity, and just send S3 traffic to the appliance. For organizations without existing tape infrastructure or HSM expertise, the simplicity message is both refreshing and genuinely appealing.

But there is a critical detail purposely buried inside each of these offerings that does not always surface clearly in vendor conversations, and that detail should be at the center of every procurement decision involving this category of product.

Once you adopt a proprietary S3-to-tape gateway appliance, you are trapped

The Vendor Lock-In Problem: Can You Read Your Data Without the Gateway?

This question should be at the center of every procurement decision in this category.

For IBM Deep Archive, Spectra BlackPearl, and Quantum ActiveScale Cold Storage, the answer is no.

This is not a theoretical concern or a minor caveat. It is the defining architectural characteristic of the vertically integrated single vendor gateway model. The gateway is not simply writing LTFS-formatted data to tape that any system could later read. It manages a proprietary data catalog, metadata store, and object-to-tape mapping that exists only inside the appliance. The tapes themselves may use standard cartridges and standard tape formats at the physical layer, but the logical organization and catalog of where everything is — which object is on which tape, at which position — lives entirely within the vendor’s closed system. The open elements (S3 protocol, LTO media, LTFS format) are surface-level. The data encapsulation is proprietary and held by the library vendor for its long-term margin and pricing advantage. 

This matters enormously over a tape archive’s lifetime. Archives are not three-year infrastructure investments. They are ten, twenty, thirty-year commitments. An organization that writes 40 PB of research data, financial records, or media assets through an IBM Deep Archive gateway, a Spectra BlackPearl, or a Quantum ActiveScale Cold Storage system has made an irrevocable architectural choice. When that gateway reaches end of support, when the vendor changes pricing, when the appliance fails catastrophically, or when a better alternative emerges, the data cannot move without the original system to read it back. The customer is locked in completely.

Some observers have called this dynamic “the great re-bundling.” It is a return to the era when tape vendors bundled their own HSM software with their libraries and charged accordingly — an era that caused significant pain for customers who eventually needed to migrate or renegotiate. The difference today is that the lock-in is more complete because the data format dependency is more opaque. Customers can be lulled into a false sense of openness by the presence of S3 APIs and LTFS formats, neither of which actually ensures data or system-level portability.The critical purchase decision is this: you do not have to buy the gateway from the library vendor. The library and the gateway are separable. You can buy an IBM Diamondback, a Spectra Cube, or a Quantum Scalar i7 RAPTOR and pair it with a hardware-agnostic, vendor-neutral S3-to-tape solution. Understanding this distinction is the entire point of this article.

The Alternative: Versity ScoutAM — A Hardware-Agnostic S3-to-Tape Gateway

Versity Software’s ScoutAM platform represents a fundamentally different approach to the same problem. It is a software-defined modern Hierarchical Storage Manager (HSM) that runs on standard commodity x86-64 hardware, supports any LTO tape library from any vendor, speaks S3 natively, and writes data in an open archival format that can be read back without any special software at all.

Versity is the only archival storage company offering all of the following simultaneously:

• An open-source filesystem and S3 gateway. The Versity S3 Gateway is Apache 2.0 licensed, available on GitHub, and designed to be extended and integrated. It is stateless, horizontally scalable, and imposes minimal CPU and memory overhead.
• An open archival file format. Data written by ScoutAM can be read without ScoutAM. Versity provides a free, perpetual read license — meaning that even if your organization stops using Versity software entirely, you retain the ability to access your archived data.
• Compatibility with legacy HSM formats. ScoutAM can read data written by IBM HPSS, IBM Spectrum Archive (TSM), HPE DMF, and Oracle OHSM. This makes Versity a migration path out of legacy systems as well as a replacement for new deployments.
• Complete hardware agnosticism. ScoutAM works with IBM, Spectra, Quantum, and BDT tape libraries interchangeably. Organizations can mix library vendors across a deployment, switch hardware vendors at refresh time, and even run multiple library brands simultaneously.

This last point deserves emphasis in the context of the new rack-modular libraries. Because ScoutAM is hardware-agnostic, you can buy the Spectra CUBE library today — because it is genuinely excellent hardware — and retain the freedom and pricing power later when you are ready to add more capacity with an IBM Diamondback. This can all be done with the same software management layer. The gateway follows the data, not the hardware vendor.

Useful Capabilities the Gateway Appliances Cannot Match

The simplicity pitch of the bundled gateway appliances trades away a significant list of capabilities that matter at enterprise scale. ScoutAM provides the full set:

Multiple copies and geo-replication. ScoutAM’s policy engine can automatically create multiple copies of archived data to different destinations simultaneously — tape at Site A, tape at Site B, and object storage in a private cloud, all governed by a single policy. The metadata for all copies replicates separately, enabling read-only access at secondary sites with automatic failover if the primary site is lost. Gateway appliances are single-destination systems; they do not natively support the copy and replication architectures that serious data protection requires.

Tape data segregation. ScoutAM supports segregating data across tape pools by classification, project, tenant, sensitivity level, or any other policy criterion. Regulated data goes on dedicated tape volumes that can be independently audited, air-gapped, or managed under separate retention policies. Gateway appliances typically treat the tape pool as a single namespace without fine-grained segregation.

Policy-driven lifecycle management. ScoutAM’s automated policy engine can tier data based on age, access frequency, content type, metadata tags, project, or any combination of criteria. Data moves from fast NVMe cache to disk to tape to cloud without manual intervention. Gateway appliances move data to tape on a schedule or when buckets fill; they do not support sophisticated multi-tier lifecycle policies.

Parallel archiving and high throughput. ScoutAM’s data parallelism engine groups small files into optimized 10 GB packages for tape write efficiency and splits large files into parallel 100 GB streaming segments, saturating multiple tape drives simultaneously. Versity’s ScoutAM has demonstrated aggregate throughput of 20–50 GB/s across parallel tape drives. Each LTO-10 drive operates at up to 400 MB/s natively; ScoutAM is designed to drive as many of them simultaneously as the library has available.

Choice of media. ScoutAM manages tape, private cloud object storage, public cloud, and disk simultaneously, with a single namespace. The same file or object can be found whether it is in NVMe cache, in a tape library, on an object store, or in the cloud.  Gateway appliances manage tape only.

File access for free. The Versity S3-to-tape Archive Engine is ScoutAM paired with Versity’s S3 gateway. While it supports an ultra efficient S3 interface, it also includes a POSIX file interface and can be mounted directly or via NFS. This enables both object and file workloads within the same solution. 

Total Cost of Ownership: Bundled Gateway Appliances vs. Versity ScoutAM

The vendor-bundled gateway pitch often includes an implicit cost-simplicity argument: one vendor, one bill, one throat to choke. But the cost comparison deserves scrutiny.

For a single-rack deployment, the hardware costs for a commodity x86 server running ScoutAM plus ScoutAM software are comparable to the bundled gateway appliance hardware and support cost. Versity’s subscription pricing covers licensing and support with no per-node, per-seat, or per-core penalties, and capacity is not metered or limited after the initial evaluation. At the single-rack scale, the total cost of the two approaches is roughly similar.

At two racks or more, the comparison shifts significantly in Versity’s favor. The gateway appliance model requires one gateway appliance per library. Pricing scales linearly with hardware appliances and in some cases with capacity under management. Versity’s software subscription does not scale that way. One ScoutAM cluster is capable of driving many individual  libraries without duplicative hardware and without forcing namespace segregation. For organizations planning 2 to 100 or more libraries,  the hardware, software and support cost divergence is material — and that is before accounting for the value of competitive leverage. An organization using ScoutAM can solicit competing bids for library hardware at every refresh cycle. An organization locked to IBM Deep Archive or Spectra BlackPearl cannot.

The Decision Framework: Separate the Gateway From the Tape Hardware

Step 1: Evaluate the rack-modular libraries on their hardware merits independently.
The IBM Diamondback, Spectra CUBE, and BDT Orion are excellent products. Their density, serviceability, and datacenter-friendly form factors are genuine advantages. Choose the hardware that best fits your capacity, budget, and performance requirements.

Step 2: Evaluate the S3 gateway separately as a distinct purchase decision.
Ask every gateway vendor the same question:

1. If I stop using your software, can I still read my data?
2. Can I use your gateway to write to a different brand of library?

For IBM Deep Archive, Spectra BlackPearl, and Quantum ActiveScale Cold Storage, the honest answers are no and no. For Versity ScoutAM, both answers are yes.

Step 3: Verify that the gateway supports the operational capabilities your workload requires:

• Multiple copies and geo-replication to separate destinations
• Fine-grained tape pool segregation by project, tenant, or classification
• Policy-driven lifecycle management across tiers (NVMe → disk → tape → cloud)
• POSIX and NFS access alongside S3
• Throughput adequate for your ingest and retrieval workloads

Do not assume that because the hardware vendor offers an S3 interface, it offers an enterprise-grade archive management platform.

The new tape libraries are a genuine reason for optimism. They make tape simpler, denser, more accessible, and more economical than it has ever been. The S3 gateway model makes tape more usable than it has ever been. But the decision about which S3 gateway to use is entirely separable from the decision about which library to buy — and getting that distinction wrong, at scale, means trading away long-term autonomy and pricing leverage.

Choose your hardware carefully. Choose your gateway wisely and beware of the bundled sale. 

Frequently Asked Questions

What is an S3-to-tape gateway?
An S3-to-tape gateway presents a tape library as an S3-compatible object storage endpoint, enabling any S3-capable application to read and write to tape without modification. Proprietary appliances like IBM Deep Archive, Spectra BlackPearl, and Quantum ActiveScale Cold Storage manage this through a closed catalog they control. The Versity S3 Gateway translates inline — no proprietary intermediary, no lock-in.

Can you read data written by IBM Deep Archive without IBM software?
No. IBM Deep Archive manages a proprietary internal catalog mapping S3 objects to tape positions. Without the original gateway appliance, the data on tape cannot be accessed, even though the physical LTO media is a standard format.

What is the difference between Spectra BlackPearl and Versity ScoutAM?
Spectra BlackPearl is a proprietary appliance that works only with Spectra tape libraries and stores data in a catalog that requires BlackPearl to read back. Versity ScoutAM is hardware-agnostic software that works with any LTO library brand and writes data in an open format with a perpetual free read license, meaning data remains accessible regardless of the software’s future.

What is a hardware-agnostic tape gateway?
A hardware-agnostic S3-to-tape gateway runs on commodity hardware and works with any LTO tape library, regardless of manufacturer. Unlike bundled appliances that lock you to a single vendor’s hardware, Versity’s gateway and ScoutAM support IBM, Spectra Logic, Quantum, and BDT libraries interchangeably.

How do I migrate from IBM HPSS, HPE DMF, or Oracle OHSM?
Versity’s ScoutAM natively reads data written by IBM HPSS, IBM Spectrum Archive (TSM), HPE DMF, and Oracle OHSM, making it a direct migration path without a separate data-extraction project.

What is the difference between on-premises S3 Glacier and AWS S3 Glacier?
AWS S3 Glacier stores data in Amazon’s infrastructure. On-premises S3 Glacier alternatives — IBM Deep Archive, Quantum ActiveScale Cold Storage, and Versity ScoutAM — provide the same S3 Glacier-compatible API but store data in tape libraries in your own data center, eliminating egress fees and retrieval latency on large data volumes.