Scored, not ranked · Updated October 2026
IBM COS review 2026
IBM Cloud Object Storage on-premises (ClevOS, formerly Cleversafe) · Slow follower
IBM COS is scored in the Object Storage Ledger 2026 (Ledger Index 52.4 out of 100) but not ranked, because it fails one of the Ledger's inclusion tests. IBM COS on-prem keeps Cleversafe's dispersed erasure coding and compliance-mode Object Lock; its recent release record is thin, so it is not ranked.
Scores
Source: Object Storage Ledger 2026, edition 2026-10-16. How each score works: methodology.
Pros
- Durability and resilience4.5/5
Cons
- Ecosystem and openness1.5/5
- Lifecycle and tiering2.5/5
What the Ledger says
IBM COS keeps the durability design Cleversafe built: objects are encrypted and dispersed as slices across nodes and sites, so no single node holds all the data, and that earns a 4.5. The rest of the record is thin for 2024 to 2026, because current release notes are not public and the newest items found are an observability feature and removals. Object Lock covers compliance mode only, and the only Veeam test is on ClevOS 3.17. A buyer should ask IBM for the 3.19 and 3.20 release dates, the Object Lock modes in 3.20, and whether new object deployments are being steered to IBM Storage Ceph.
IBM COS on-premises has no AI feature on record. Its AI role is a capacity tier behind the APIs, while IBM's AI storage story runs through other products.
Capability by area
Buying, lock-in and release record
Buying and licence (commercial risk)(lower is better)
- Price and licence volatility2
- Perpetual, subscription and consumption options; no change found, and no public prices
- Purchase constraints2.5
- Several licence models and a choice of certified hardware vendors; quote only
- Channel and access3
- IBM direct and Business Partners; lifecycle dates, alerts and current notes need an IBM login
- Owner stability2
- Large listed owner since 2015; IBM now also sells IBM Storage Ceph for object, and no statement on the future of COS was found
- Cost of staying supported2.5
- End of support dates not readable; Continuous Delivery model asks for regular upgrades
Technical lock-in(lower is better)
- Formats4
- Encrypted, dispersed slices that are readable only through the system
- Export path1.5
- S3 reads and S3 proxy and migration features in vault mode
- Stack coupling3
- Own Manager, Accesser and Slicestor stack
- Hardware / cloud coupling2.5
- IBM appliances or certified x86 servers from several vendors; runs on-premises
- Skills and tooling coupling3
- IBM-specific Manager, Accesser and Slicestor skills
Release credibility
- Cadence3
- Continuous Delivery model since 3.16 with frequent point releases; release dates are not published
- Roadmap transparency1.5
- Older release notes PDFs are public; current notes, lifecycle dates and alerts sit behind an IBM login; no roadmap
- Say-do3
- No forward announcements for the on-premises product were found to test
- Velocity2.5
- Recent items are observability and removals; the last substantive capability found is Object Lock in 2023
- Lifecycle stability3
- A defined Continuous Delivery model with a longer-term option; no forced migration seen
Partners and services
- Partner programme openness3
- IBM Business Partner programme; terms for COS not read
- Multi-tenancy and self-service4
- Container mode scales to millions of containers and users, with a storage account portal, a Service API and usage reports in CSV, JSON or XML (Redpaper)
- API and infrastructure-as-code3
- S3, Service API and Manager REST API; no Terraform or Ansible found
- Skills and certification2.5
- No COS certification track verified
Alternatives to IBM COS
Questions about IBM COS
Is IBM COS any good?
IBM COS is scored in the Object Storage Ledger 2026 (Ledger Index 52.4 out of 100) but not ranked, because it fails one of the Ledger's inclusion tests. Its strongest areas are durability and resilience. Its weakest are ecosystem and openness, lifecycle and tiering.
What are the best alternatives to IBM COS?
The closest by Ledger Index are ActiveScale (51.6), ARTESCA (54.3), Qumulo (54.4), Hitachi HCP (54.7).
How is IBM COS licensed and sold?
Perpetual, subscription and consumption options; no change found, and no public prices.
How much lock-in does IBM COS bring?
IBM COS scores 14 out of 25 on technical lock-in (lower is better). Export path: S3 reads and S3 proxy and migration features in vault mode.
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