SIOS DataKeeper Cluster Edition

Release Notes

Version 8.10.0

Released December 13, 2023


Read This Document Before Attempting To Install Or Use This Product!
This document contains last minute information that must be considered before, during and after installation.


SIOS Datakeeper Cluster Edition is a highly optimized host-based replication solution which integrates seamlessly with Windows Server 2019, Windows Server 2016, Windows Server 2012, Windows Server 2012 R2, Windows Server 2008 R2/2008 R2 SP1 and Windows Server 2022 Failover Clustering. Features of Windows Server Failover Clustering such as cross-subnet failover and tunable heartbeat parameters make it easy for administrators to deploy geographically dispersed clusters. SIOS DataKeeper provides the data replication mechanism which extends both versions of Windows Clustering, allowing administrators to take advantage of these advanced features to support non-shared disk high availability configurations.

Once SIOS DataKeeper Cluster Edition is installed, a new storage class resource type called DataKeeper Volume is available. This new SIOS DataKeeper Volume resource can be used in place of the traditional Physical Disk shared storage resource to enable geographically dispersed clusters, also known as multi-site clusters.

Quick Links

What’s New in this Release?
Bug Fixes
Discontinued Features
DataKeeper Cluster Edition Requirements
DataKeeper Requirements
Local Security Policy Requirement
Known Issues
Quick Start Guide

New Features of Supported Versions of SIOS DataKeeper Cluster Edition v8

New in This Release
VMware vSphere 8.0 Update1 and Update2 are supported (Certified in May 2024).
Synchronous mirror performance improvement.
Amazon EBS encryption is supported.
Bug Fixes
New in Version 8.9.2
Support for VMware vSphere 8.0
See the Support Matrix for supported configuration details.
Bug Fixes
New in Version 8.9.1
AWS Cross Region Support.
Display warning in DK GUI if a connected server has Automatically Manage Pagefiles enabled.
Added Total Bytes column for volumes on the Server Overview page.
Users will now see a warning in the DK GUI if any target volumes are too small after resizing.
Upgrade AlphaVSS and IronPython to latest versions, 2.0.0 and 2.7.12 respectively.
Show volume size in mirror creation dialogs.
User systems will receive a notification if there are any mirrored volumes on a system configured with “System Managed” page files.
Automatically update reported size when a volume is shrunk or expanded.
Stop supporting Windows operating systems older than Server 2012 and Client 10.
Bug Fixes
New in Version 8.9.0
SIOS DataKeeper Cluster Edition Version 8.9.0 is the last version that will support Microsoft Windows Server 2008 R2 Enterprise and DataCenter Editions. It is currently only supported in Azure. Any subsequent releases will not support an install or upgrade for Microsoft Windows Server 2008 R2.
Bug Fixes
New in Version 8.8.2
Windows Server 2022 Support
Windows 2011 Support
Fixed memory leak in ExtMirrSvc. See this IMPORTANT NOTICE for more information.
Bug Fixes
New in Version 8.8.1
Bug Fixes
New in Version 8.8.0
Bug Fixes
New in Version 8.7.2
Support for VMware vSphere 7.0
See the Support Matrix for supported configuration details.
New in Version 8.7.1
DataKeeper Cluster Edition now supports Azure Stack on Windows 2019
Bug Fixes

Bug Fixes

The following is a list of the latest bug fixes and enhancements.

PW-6120 Switchover test when detaching a volume gets error
PW-6373 DataKeeper didn’t detect a conflict for target volume dispatch port
PW-7023 DKCE resource DLL’s JoinClusterWorker never terminates
PW-8024 Volume unexpectedly locked
PW-8161 Avoid registry key flush on target node at boot time
PW-9282 Emcmd Changemirrorendpoints causes ExtMirrSvc to crash – v8.10.0

Discontinued Features of DataKeeper Cluster Edition v8

Discontinued in This Release
Hyper-V 2012 R2 is no longer supported.
Windows Server 2012 and 2012 R2 Enterprise and DataCenter Editions are no longer supported.
Discontinued in v8.9.2
Discontinued in v8.9.1
Windows Server 2008 R2 Enterprise and DataCenter Editions are no longer supported
Hyper-V Server 2008 R2 is no longer supported
Discontinued in v8.9.0
Windows 7 is no longer supported
Windows 8 is no longer supported

DataKeeper Cluster Edition Requirements

Server Components See the DKCE Support Matrix

All servers should run the same version of Windows and the same version of DataKeeper software.

Make sure you verify the following settings prior to installing and configuring SIOS DataKeeper Cluster Edition.
  • Follow Microsoft best practices for deploying geographically dispersed clusters, including changing the quorum mode majority node setting with a file share witness.
DataKeeper Failover Cluster registration is automatic and occurs 60 seconds after the following events have occurred on each cluster node:
  • A DataKeeper Cluster Edition license has been installed on each cluster node.
  • The Windows server Failover Clustering feature has been installed on each server.
  • A Windows server Cluster configuration has been formed.

Hotfix – KB 951308

If protecting Hyper-V resources, Hotfix KB 958065

Note: These hotfixes are not required for Windows Server 2008 R2/2008 R2 SP1.

Contact Microsoft for a fix that will allow NICs to be added to a Virtual Machine after the VM has been placed into a Failover Cluster. (For more information, see Hyper-V Host Cluster Error.)

User Interface See the DKCE Support Matrix

MMC 3.0 – download from:

DataKeeper System Requirements

Minimum Requirements
Memory 1 GB RAM
Processor Refer to Windows Server Processor Requirements
Disk size 53 MB required for install

Local Security Policy Requirement

If your Windows servers are not in a domain and you are going to run the DataKeeper Service as the local system account, the Local Security policy setting “Network Access: Let Everyone permissions apply to anonymous users” must be enabled.

Known Issues

Missing Job Information warning displayed during mirror creation or deletion

During job creation, the warning “This computer is missing SIOS DataKeeper Job information for the following target volume(s): <vol>” might be displayed in the GUI briefly. The warning will go away after a few seconds. This is a transient condition that can occur during mirror creation and deletion, and does not indicate an error.

Windows 2016

SCVMM 2012

If using DataKeeper with SCVMM 2012, you must use SCVMM 2012 SP1.

Windows Server 2012

For issues and enhancements related to Windows Server 2012, see the following topics:

WSFC 2012 Failover Cluster Manager UI Defect
Manual Creation of a Mirror in WSFC
WSFC 2012 Cluster Creation Default Setting Issue
WSFC 2012 File Shares Cannot be Created for File Server Resource
WSFC 2012 Server Manager — Incorrect Volume Display
WSFC 2012 Server Manager — DataKeeper “Disk” Not Shown as Clustered
Windows Server 2012 Default Information Missing During Mirror Creation
Windows Server 2012 DataKeeper MMC Snap-in Crash
Windows Server 2012 — Simultaneous Move of Multiple Clustered File Server Roles Can Result in DataKeeper Switchover Failures
Windows Server 2012 iSCSI Target Role Does Not Support Dynamic Disks
Using iSCSI Target with DataKeeper

Windows 2008 R2

SIOS DataKeeper includes a kernel-mode driver (ExtMirr.sys) which is signed with a SHA-256 signature. If you are installing on a Windows 2008 R2 system that has not been updated with Microsoft hotfixes, it might not be able to boot with such a driver. Please refer to this bulletin from Microsoft for more information, in particular the first event listed which applies to Windows 2008 R2 SP1.

If you are updating SIOS DataKeeper, and your previous version was version 8.6.2 or later, then your system does have SHA-256 driver support (the 8.6.2 driver is signed with SHA-256). In that case you can safely install this version of DataKeeper.

Also see the Known Issues and Workarounds and Restrictions sections of DataKeeper Cluster Edition Technical Documentation.

DataKeeper Cluster Edition Quick Start Guide

To get started using SIOS DataKeeper Cluster Edition, refer to the DataKeeper Cluster Edition Quick Start Guide.

Technical Support

As a SIOS Technology Corp. customer with a valid Support contract, you are entitled to access the SIOS Technology Corp. Support Self-Service Portal.

The SIOS Technology Corp. Support Self-Service Portal offers you the following capabilities:

  • Search our Solution Knowledge Base to find solutions to problems and answers to questions
  • Always on 24/7 service with the SIOS Technology Corp. Support team to:
    • Log a Case to report new incidents.
    • View Cases to see all of your open and closed incidents.
    • Review Top Solutions providing information on the most popular problem resolutions being viewed by our customers.

Contact SIOS Technology Corp. Support at to set up and activate your Self-Service Portal account.

Contacting Support during Business Hours:

Please call if you have a critical issue involving a down production system or application where your data cannot be accessed using the SIOS Technology products.

1-877-457-5113 (Toll Free)

1-803-808-4270 (International)

For any other issues or questions, please open a case by logging into the Self Service Portal or sending an email to

For After Hours Support For Critical Issues:

Outside of business hours and on the weekends, emergency support with guaranteed two-hour response time 24 hours per day, 7 days per week, 365 days per year is included under Product Support. After hours Support is only available for critical issues involving a down production system or application where your data cannot be accessed using the SIOS Technology products. These issues are handled by contacting the numbers below. Please note that emails to are not monitored outside of business hours and on the weekends. Non-critical issues are handled during business hours.

1-877-457-5113 (Toll Free)

1-803-808-4270 (International)


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