File Storage · head to head
Ceph vs VAST Data
Ceph
File Storage
Open source distributed storage providing object, block and file from one cluster
- From
- Free
- Rated
- -
VAST Data
File Storage
All-flash storage designed to make hard disk tiers unnecessary
- From
- On request
- Rated
- -
The short version
- Only Ceph has a free tier, so it costs nothing to try first.
- Each has a real cost: Ceph ceph assumes an operator who understands placement groups, CRUSH rules and recovery tuning, so organisations without dedicated storage staff routinely end up with a cluster that works until the first failure and then does not.; VAST Data data reduction ratios drive the economics, and datasets that are already compressed, such as media or encrypted files, reduce poorly and destroy the cost per terabyte case.
- They diverge on capability: Ceph covers RADOS object store, VAST Data covers Disaggregated architecture.
- Prices and features above were last checked on 1 September 2026.
Where they differ
Only the attributes on which Ceph and VAST Data actually diverge.
Identical on both: platforms (Linux), user rating (Not yet rated), category (File Storage).
What each one covers
Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.
Only in Ceph
- RADOS object store
- RADOS Gateway
- RBD block devices
- CephFS
- CRUSH placement
- Erasure coded pools
Only in VAST Data
- Disaggregated architecture
- Similarity-based reduction
- All-flash single tier
- Multi-protocol access
- Wide erasure coding
- GPU-oriented throughput
- Snapshots and replication
What people use each for
The jobs each tool is most often brought in to do.
Ceph
- Backing a private cloud where virtual machine disks, shared filesystems and an S3 endpoint all need the same hardwarenot VAST Data
- Growing past the point where a proprietary array upgrade costs more than a rack of commodity serversnot VAST Data
- Research and media environments with petabytes of data and staff who can operate storagenot VAST Data
- Providing an S3 endpoint on premises with multi site replication under your own controlnot VAST Data
VAST Data
- A GPU training cluster where storage throughput, not compute, is the bottleneck on job completionnot Ceph
- A genomics group holding petabytes of sequencing output that must stay immediately readable rather than archived to tapenot Ceph
- A quantitative finance team running backtests over historical market data that a disk tier cannot serve fast enoughnot Ceph
- An organisation consolidating a fast tier and an archive tier into one system to reduce rack space and power drawnot Ceph
Where each one falls short
Documented limitations, not opinions. Every one is a constraint you would hit in normal use.
Ceph
- Ceph assumes an operator who understands placement groups, CRUSH rules and recovery tuning, so organisations without dedicated storage staff routinely end up with a cluster that works until the first failure and then does not.
- Small clusters are inefficient: three way replication means a third of raw capacity is usable, and erasure coding needs enough failure domains to be safe, so the economics only work above a certain size.
- Recovery and rebalancing generate heavy internal traffic, so a failed disk can degrade client latency across the cluster unless backfill is throttled correctly beforehand.
- Upgrades must follow a strict daemon order across monitors, managers, OSDs and gateways, and a mistake in that order on a live cluster is difficult to reverse.
- Because it is self hosted, every byte served to the internet is transit you pay for on your own links, so the free licence does not mean free egress and bandwidth planning becomes your problem rather than the providers.
VAST Data
- Data reduction ratios drive the economics, and datasets that are already compressed, such as media or encrypted files, reduce poorly and destroy the cost per terabyte case.
- There is a minimum viable cluster size, so the entry cost is high and the platform is not sensible for a small footprint however attractive the architecture is.
- Pricing is quoted against effective capacity after reduction, which means the price you signed depends on an assumption about your own data that only becomes measurable after deployment.
- The platform has expanded into database and data catalogue functions, which broadens the roadmap but means buyers evaluating it as a file system must be careful not to be sold an adjacent product they will not use.
- As a relatively young vendor in a market of long-lived incumbents, buyers with ten year retention requirements should press on long term support commitments and hardware availability rather than assume them.
Pricing, plan by plan
Ceph
Free- CephFree
- Full functionality, no capacity limit
- Object, block and file interfaces
- Community support via mailing list and Slack
VAST Data
On request- VAST Data Platform$undefined/year
- Priced per usable capacity after data reduction
- Hardware and software sold together or via certified partners
- Subscription and capital purchase options
Which should you pick?
Choose Ceph if
- You need rados object store.
- You want to start without paying.
- You work on Linux.
- You also want rados gateway.
Choose VAST Data if
- You need disaggregated architecture.
- You work on Linux.
- You also want similarity-based reduction.
Questions people ask
- Is Ceph or VAST Data better?
- Neither clearly leads. Ceph starts at Free and VAST Data at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, Ceph or VAST Data?
- Ceph has a free tier; the other does not. Paid plans start at Free for Ceph and On request for VAST Data.
- Does Ceph or VAST Data run on more platforms?
- Both run on Linux, so platform support will not decide this one for you.
- Can I use Ceph for free?
- Yes. Ceph has a free tier, so you can try it without paying. VAST Data starts at On request.
- What is Ceph best used for?
- Ceph is most often used for backing a private cloud where virtual machine disks, shared filesystems and an s3 endpoint all need the same hardware, growing past the point where a proprietary array upgrade costs more than a rack of commodity servers, research and media environments with petabytes of data and staff who can operate storage, providing an s3 endpoint on premises with multi site replication under your own control. Of those, backing a private cloud where virtual machine disks, shared filesystems and an s3 endpoint all need the same hardware and growing past the point where a proprietary array upgrade costs more than a rack of commodity servers are not what VAST Data is typically brought in for.
- What can Ceph do that VAST Data cannot?
- Ceph covers RADOS object store, RADOS Gateway, RBD block devices, CephFS. VAST Data covers Disaggregated architecture, Similarity-based reduction, All-flash single tier, Multi-protocol access.
Answered from the vendors’ own pages
Ceph: How many nodes do I need to start?
Three is the practical minimum for a replicated cluster with real fault tolerance, and most production advice starts at five once you account for maintenance windows.
VAST Data: Do we still need an archive tier?
That is the central claim, and it holds when your data reduces well. Run a reduction assessment on your actual dataset before accepting the economics.
Ceph: Is it faster than a SAN?
Not on single stream latency. It wins on aggregate throughput and on growing without a forklift upgrade, which is a different property from raw speed.
VAST Data: How is capacity priced?
On usable capacity after data reduction, quoted rather than published. That makes the reduction ratio assumption the most important number in the contract.
Ceph: Can I buy support?
Yes. IBM sells IBM Storage Ceph and SUSE and others have offered supported builds; the upstream project itself is free.
VAST Data: Is it suitable for a small deployment?
No. There is a minimum cluster size and the entry cost reflects it. Small footprints are better served elsewhere.
Ceph: Should I use it just for S3?
If object is all you need, a dedicated object store is simpler to run. Ceph earns its complexity when you need block and file as well.
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