Copy-on-write architecture with native immutable Recovery Points, end-to-end data integrity, deduplication and compression — the storage foundation of every Syneto product.
Syneto SpA
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VAT RO15999720 · REG J35/2971/2003
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Web: https://syneto.eu
Italy (HQ) · Brescia
Romania · Timișoara
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ISO/IEC 27001 — Information Security
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This whitepaper documents the SyFS filesystem in detail: on-disk format, transaction-group commit cycle, RAIN replication groups, ARC/L2ARC caching, end-to-end checksumming and self-healing, the WORM lifecycle of Recovery Points, scrub semantics, capacity math (dedup + compression), and the operational tooling exposed to administrators.
SyFS is a 128-bit copy-on-write filesystem derived from the OpenZFS lineage and extensively hardened for the Syneto Hybrid Cloud Ecosystem. Unlike a traditional LVM+ext4 stack, SyFS unifies volume management, RAID, snapshots, replication and checksumming into a single in-kernel subsystem.
Each pointer carries enough metadata to detect silent corruption (checksum), reason about replication (birth-txg), and locate redundant copies — without consulting a separate index. The metadata IS the address.
A POSIX write enters the DMU layer, accumulates in a transaction group, and lands atomically when the group commits. The uberblock — the root pointer of the on-disk Merkle tree — is updated last. Crashes are silently safe.
A Recovery Point is created by pinning the current set of block pointers and incrementing the dataset txg. The cost is constant-time, regardless of dataset size. There is no copy. There is no scan.
Atomic pin on current block-pointer set. <1 ms, no IO.
WORM seal applied by the SPA layer. Immutability enforced kernel-side.
Smart Replicator pushes delta-only encrypted stream to peer / vault.
On SLA-Policy expiry, block pointers are released back to the free list.
SyFS applies inline deduplication and compression on the write path — the data on disk is the deduplicated, compressed form. No post-process pass, no read penalty.
VDI / virtual desktops: 4-6×. Database VMs: 2.5-3×. Mixed VM workloads: 3-4×. Backup datasets: 5-8×. The pool report shows real-time ratios per dataset.
A scrub reads every block in the pool, verifies checksums, and rewrites any mismatches from redundant copies. Runs weekly by default at lowest IO priority — production stays online and untouched.
# Inspect pool healthsyctl pool status hyper-prodstate: ONLINEscan: scrub repaired 0B in 3h12m, 1 errors correctedconfig: 24× nvme RAID-Z2 (no faults)# Trigger an immediate scrubsyctl pool scrub hyper-prod --priority low# Query Recovery Point retention for a VMsyctl recovery-point list vm-erp-01 --window 24h
Syneto designs and manufactures the complete Hybrid Cloud Ecosystem — hypervisor, data management, data protection and disaster recovery in a single plug & play platform. Founded in 2008, headquartered in Brescia and Timișoara, serving 5,000+ European businesses.
Designed, built and supported in Europe. ISO 9001 and ISO/IEC 27001 certified operations.
Production-ready in under 30 minutes. No multi-vendor integration, no professional services required.
One contract, one phone number, one SLA — for the entire stack. Local language support.
Across 18+ years of customer deployments, no Syneto customer has ever paid ransom following a cyber incident.
Single-vendor support — one contract, one phone number, one SLA for the entire stack. Three response tiers, all delivered by Syneto engineers in your language.
| Plan | Response | Coverage | Who it's for |
|---|---|---|---|
| Essential | NBD — 8×5 | Software + hardware | Branch offices, test & dev |
| Business | 4 h — 24×7 | Software + hardware | Production workloads |
| Mission-Critical | 1 h — 24×7 | Software + hardware + TAM | Business-critical sites, DR |
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