Technical library

Test results and engineering notes.
With the method and the limits.

Failover test reports, operating guides and best practices for OviOS storage and high availability. Each document says what was tested, how, and what was not, so you can judge it for your own environment.

Documents

High availability

Test report
6 NOV 2026 · 3-NODE CLUSTER · iSCSI / SMB / NFS · 7-PAGE PDF

Unplanned failover report

We pulled the network cable from the active node under a sustained random read/write load, once for each protocol, and measured what the client saw.

  • 0 application I/O errors on iSCSI, SMB 3.1.1 and NFS v4.2
  • About 35 s longest I/O pause for iSCSI and SMB, about 60 s for NFS
  • Client mount options and cluster settings used, and what was not tested
Read the report PDF
Advanced guide
OCT 2026 · ovios-cluster · 25-PAGE PDF

Advanced cluster administrator guide

An in-depth guide to how the cluster works, for the person who configures and operates it. It explains why the cluster does what it does, not only which command to run.

  • How the cluster decides: the exact rules a primary and a replica follow, with a worked failure timeline
  • Fencing and the watchdog, witness versus tiebreaker, quorum and why the number of voters should be odd
  • Reference: every setting and how settings depend on each other, limits, commands, log events, and what is verified
Download the PDF Step-by-step cluster guide

Run it on your own hardware.

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More to read

Guides and reference

Cluster guide

Build a cluster step by step: nodes, VIP, witness, switchover, failover and alerting.

Replication guide

retadm: replicate volumes and LUNs to a remote node for backup and recovery.

Use cases

What people build with OviOS: HA and DR, VM storage, file serving, S3 and more.