Business Continuity & Disaster Recovery IRIS release notes

Topic

This article contains software release notes for Datto SIRIS, ALTO, and NAS Business Continuity & Disaster Recovery (BCDR) appliances. To learn how to deploy a Datto appliance, see Setting up a new Datto appliance

Environment

  • Datto SIRIS
  • Datto ALTO
  • Datto NAS

Description

The software stack on Datto appliances is named IRIS. Release notes for this software stack appear here, ordered from the most recent release to the oldest.

Datto pushes IRIS updates out to devices on a rolling basis. Your device may not be updated immediately upon each new release. Update windows will vary, but are generally completed within one to two weeks of the initial release date.

Index

2025

Releases

Datto IRIS 5.1.1 - April 10, 2025

IBU: 2968

Bug Fixes

  • Screenshot Verification Reliability: Improved reliability by adding retry attempts and preserving screenshots on timeout for better post-failure analysis.
  • Agentless Backup Failures – VMware VDDK Mountpoints: Addressed intermittent failures caused by issues accessing VMware virtual disks via VDDK.
  • Agentless Backup Stalling at 99%: Resolved issues where encrypted Agentless VMware backups stalled near completion during transfer.
  • Drive Temperature Alerts – WD Blue & Kingston Models: Corrected inaccurate drive temperature warnings on the Advanced Device Status page for certain WD Blue and Kingston drives.
  • Interrupted Update – Configuration Loss or Boot Issues: Improved update robustness to prevent configuration loss or boot failures after interrupted updates.
  • MBR Partition Handling: Fixed restore and verification failures with large (>2TB) Windows dynamic spanned volumes. Also corrected incorrect boot flags on Linux volumes that could block virtual boot.
  • Offsite Replication – 'Apply to All' Retention Conflict: Using "Apply to All" no longer incorrectly changes retention for non-replicated assets.

Improvements

  • NAS Guard Backup Timeout: Increased timeout to support shares with very large file counts.
  • Direct to Cloud Node Startup: Improved startup reliability by handling storage access failures after reboots or network interruptions more gracefully.
  • Hybrid Virtualization – Cloud Network Reconnection: Devices now automatically attempt to reconnect to cloud networks used for Hybrid Virtualizations after reboot.

Datto IRIS 5.0.2 - March 12, 2025

IBU: 2936

Notes

  • This release contains major OS upgrade to Ubuntu 22.04 which brings a lot of improvements and bugfixes to long-lasting issues.
  • Updating from Ubuntu 16.04-based systems is not supported.
  • Due to security concerns, as of this release, new USB roundtrips will need to be encrypted.

Bug Fixes

  • IO errors are now properly reported for S5-X devices on Advanced Device Status page.
  • Reliability of DHCP lease restoration is improved.
  • UI issues related to Backup Verification Scripts were resolved.
  • Temperature reporting on SIRIS5 was overhauled which should result in improved consistency and reliability of both current values and thresholds.