SIOS DataKeeper Cluster Edition

Release Notes

Version 8.9.0

(Version 8 Update 9)

Released July 13, 2022


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, and Windows Server 2008 R2/2008 R2 SP1 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.

New Features of SIOS DataKeeper Cluster Edition v8

New in This Release
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
New in Version 8.7.0
Full Support of Windows 2019 with Secure Boot
DataKeeper now supports AWS Nitro System
Bug Fixes
New in Version 8.6.5
Bug Fixes
New in Version 8.6.4
DataKeeper now supports Windows 2019 (Restrictions v8.6.4 only)
Introduced the BlockWritesOnLimitReached tunable, which will delay writes when a mirror’s queue reaches the HighWater or ByteLimit, rather than pausing the mirror and going into a resync state.
Bug Fixes
New in Version 8.6.3
This Performance Monitor Counter value is the age of the oldest write request in the write queue. Refer to Queue Current Age.
Bug Fixes
New in Version 8.6.2
DataKeeper now includes the DataKeeper Signal package to deliver events to SIOS iQ.
Bug Fixes
New in Version 8.6.1
Bug Fixes
New in Version 8.6
Users can specify the maximum number of bytes that can be allocated for the write queue of a mirror by changing the WriteQueueByteLimitMB registry value.
Bug Fixes
New in Version 8.5.1
DataKeeper now supports Windows 2016.
SIOS VSS Provider has been disabled by default.
Bug Fixes
New in Version 8.5
CHANGEMIRRORTYPE command is used to change the mirror type of a mirror that is part of a DataKeeper job.
Users can modify the effective size of an entry in the DataKeeper intent log (bitmap) by changing the BitmapBytesPerBlock registry value.
Bug Fixes
New in Version 8.4
DataKeeper Volume Resource Health Check determines if the underlying volume device becomes unreachable.
Target writes are now tracked in a persistent target bitmap file.
Bug Fixes
New in Version 8.3
The DataKeeper Notification Icon shows a summary of your DataKeeper mirrors in the Windows Notification Tray. In addition to the display functions, the DataKeeper Notification Icon also serves as a shortcut to managing your DataKeeper mirrors.
mirrorcleanup.cmd will remove all remnants of a mirror for a selected volume on the local system only and should only be run when recommended by SIOS Support.
Powershell cmdlets that can be used to create job(s), create mirror(s), remove job(s), remove mirror(s) and fetch information about a volume used in DataKeeper (New-DataKeeperMirror, New-DataKeeperJob, Remove-DataKeeperMirror, Remove-DataKeeperJob, Add-DataKeeperJobPair, Get-DataKeeperVolumeInfo).
DKHEALTHCHECK .Support status and issue identification tool. Provides command line interface for basic mirror status and problem detection.
Bug Fixes
New in Version 8.2.1
Bug Fixes
New in Version 8.2
The DataKeeper Non-Mirrored Volume Cluster Resource allows users to use a local volume in a failover cluster without requiring that it be part of a mirror. Some of the common use cases for this feature include enabling rolling cluster OS upgrades on existing hardware and moving tempdb to local storage in SQL 2008 R2 clusters and earlier.
Bug Fixes
New in Version 8.1
Bug Fixes
New in Version 8.0.1
Bug Fixes
New in Version 8.0.
DataKeeper now allows you to have a replication target which resides outside of the failover cluster.
DataKeeper now only supports Windows 2008R2 and later 64-bit Operating Systems. To run on an earlier version of Windows or on 32-bit systems, you must use DataKeeper v7.
DataKeeper now supports Windows 2012 R2.
Bug Fixes

Bug Fixes

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

PW-3770 Avoid logging a sequence of duplicate ExtMirr event ID 262 when an invalid packet is received
PW-4482 Updated FlexNet to 11.18
PW-5191 Updated Apache log4net to 2.0.14
PW-5816 Handle a LockVolume request that takes a long time to complete
PW-6066 Potential BSOD on alloc failure during volume write
PW-6073 Potential BSOD on alloc failure during endpoint change

Hot Fixes and Add-on Support Packages

The patches are located here.

Hotfix/Add-on Support Package
Bug Description
Patch Description
DKPatch_PW-8024-8901 NDLG locked my volume This patch properly prevents NDLG from locking the volume

Discontinued Features of DataKeeper Cluster Edition v8

Discontinued in This Release
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

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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