31 Dec 2026

Varonis is pulling the plug on on-prem. ProLion isn’t.

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ProLion Platform
Industries
Energy & utilities

Availability is the regulation.

An outage is not an IT incident here, it is a public one. And the control-room file shares that nobody thinks about are on the same network as everything else.

NetApp

Syslog CEF and REST, into the tool you already run

See it running

When one site goes dark, the other one takes over.

Film still: Energy & utilities
0:59

The night the primary site went dark.

A failed transformer or somebody pulling the plug on purpose — either way, the second site only helps you if the switchover actually happens. Replication was never the hard part.

Without

The failover waits for a person to be sure.

  1. 03:20 The primary data center loses power and its network path.
  2. 03:20–04:10 Someone is woken up, works out what is still alive, and starts the procedure by hand.
  3. 03:50 Both sites briefly believe they are primary. Split brain.
  4. 04:40 File services are back. The incident report opens with eighty minutes.

Outcome

Eighty minutes of downtime in a sector that reports them, a regulator asking why, and a split brain to explain afterward.

With ProLion

The second site takes over before anyone is woken.

  1. 03:20 The same loss. The readiness checks have been running continuously all along.
  2. 03:20 +sec Quorum logic decides and the switchover runs on its own, SAN and NAS together.
  3. 03:21 The second site is serving. The on-call phone does not ring.
  4. Report Every health check and every step of the decision is on record.

Outcome

Minutes instead of an hour, no split brain, and a switchover you can show a regulator.

A scenario, not a case study — built from the way these incidents actually run.

What the rules ask for.

Energy is an essential sector under NIS2, with the shortest patience for downtime of any of them.

NIS2
Energy as an essential sector
Risk-management measures, access control and the 24-hour, 72-hour and one-month reporting cascade, with the heavier supervisory regime
Availability
Failover that actually happens
Replication to a second site is standard; the switchover is where plans turn out to be theory
Retention
Operational records kept for years
Grid, metering and maintenance records outlive the systems that produced them
Segregation
Sites that do not talk to the internet
Protection has to work at a substation with no outbound connection

Orientation, not legal advice. NIS2 applies through national transposition, so sector scope, thresholds and deadlines differ per country — check yours.

Where it goes wrong on the shares.

Documentation, schematics and maintenance records live on file shares that were set up when the plant was commissioned and have been inherited ever since.

Detection without a scan
Attacks are caught on the file system’s own event stream, in seconds, not on the next scheduled pass.
ClusterLion for the second site
Automatic, audited switchover between data centers, decided outside the cluster by quorum logic.
Dark sites included
The appliance runs fully on-premises, with no outbound connection required.
Who can reach the schematics
Effective permissions per file, across every nested group and contractor account.
The record a regulator accepts
Every file operation with user, path and timestamp, kept as long as you need it.
Back online in hours
Single-file restore scoped to the damage, out of the snapshots that are already being taken.
What this looks like in practice

“Without these solutions, I would feel less comfortable.”

Ivo Dissel
IT & System Admin, OLVG Amsterdam

Let’s solve your data challenges.

Connect with our engineers to find the right approach for your infrastructure.

What you would be running

One platform, two packages.

One appliance on your own hardware, in two feature packages. DataGovernance contains everything in DataDefense.

One Platform

Two Packages

ProLion DataDefense

Base

For IT teams who need critical data up, recorded and recoverable.

  • File visibility, who did what and when
  • Ransomware containment in four seconds
  • Single-file restore from snapshot
  • Capacity, growth and hot/cold reports
  • Permission insight and broken inheritance
  • Four-eyes principle
  • SIEM, SOAR and ITSM integration
  • SSO via Entra ID, Okta, SAML, OIDC
Find out more

ProLion DataGovernance

DSPM

For security, compliance and AI teams who have to prove and control who reaches what.

Everything in DataDefense, plus:
  • Access analytics — effective permissions
  • Real-time permission audit log
  • Activity Zones and quarantine
  • Active Directory security
  • Unlimited file activity retention
  • SharePoint Online and OneDrive
  • Classification of sensitive data
  • Remediation of permissions and labels
Find out more

Wherever your data already sits — NetApp, Lenovo, Dell and Microsoft, read at the data layer itself, with no agent on the file server.

Talk to an engineer who knows your data.

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