Nirmal's Knowledge Repository : SCCM SQL Based Replication (DRS)

New (SQL) based site to site replication model is the most challenging but very interesting part (at least for me) of System Center 2012 Configuration Manager. So, I thought of sharing the some points which are main pillars of SQL replication model

Key components of new (SQL) based replication model

1. DRS – Data Replication Service

2. SSB – SQL Service Broker

3. RCM – Replication Configuration Management/Monitoring

4. RG – Replication Group

5. Replication Pattern

6. Article Name/s

Also some tips:: how to :: force or re-init site to site replication, verify the site to site replication……

Before going into deep dive, I would like to thank Saud Al-Mishari, Microsoft PFE who was the speaker of MMS 2012 session “CD-B407”. This post is inspired from his session.

DRS – Data Replication Service / SSB – SQL Service Broker

To replicate the data between configmgr sites, Configuration Manager uses Database Replication Service (DRS). The DRS intern uses SQL Server Service Broker (SSB) to replicate data between the sites.

More Details about DRS – TechNet Article

More Details about SSB – SQL Team Article

RCM – Replication Configuration Management/Monitoring

RCM is a thread of SMSEXEC. As the name suggests, this thread keeps an eye on Replication Configuration and Monitoring. You can refer to rcmctrl.log file to get more details about RCM related activities.

RG – Replication Group

Replication Groups are a set of tables that are monitored and replicated together. Replication groups are segregated and grouped in to THREE Replication Patterns.

To get the full list of RG along with replication schedule – Run the SQL query – Select * from vReplicationData

Each RG (Replication Group) has a unique Replication ID. In CM 2012 RTM release, all the transport is based on DRS.

Replication Pattern

Replication Patterns are group rules based on those, the replication groups are segregated. Three replication patterns are available. More Details about Data Replication – TechNet Blog

a) Global – Global data is anything that is created by administrator. Two way replication between the CAS and Primaries. e.g Package Metadata

b) Global_Proxy – This Replication data is based out secondary servers.

c) Site – One way replication to the parent site / CAS. e.g Software Inventory/Hardware Inventory

Article Name/s

Replication Groups are further divided into Article Names based on ReplicationID . Each RG (Replication Group) has a unique Replication ID.

Run the SQL query to get the list of Article Names “ Select * from vArticleData “

e.g Add_Remove_Programs_64_DATA, Add_Remove_Programs_64_HIST, Add_Remove_Programs_DATA, BoundaryGroup, BoundaryGroupMembers etc…

Force Site To Site Replication / re-init process

You can use <site_Code>.SHA file or Preinst.exe /syncchild, If you want to force site to site replication in SCCM / ConfigMgr 2007. Fortunately/Unfortunately, these methods are NOT going to work in CM 2012 Smile

/SYNCCHILD option to sync child sites has been deprecated. This functionality is
not longer required in System Center 2012 Configuration Manager.

If you need to perform a manual sync between the CAS and Primary server, same like dropping .SHA file in the inbox or syncchild…..

You can use the stored procedure (sproc) spDrsSendSubscriptionInvalid with suitable parameter to force the site to site replication.

Word of caution – This will start the re replication between the sites and may cause of lot of Network Traffic…..

EXEC spDrsSendSubscriptionInvalid,,

e.g  EXEC spDrsSendSubscriptionInvalid 'PR1', 'CAS', 'Configuration Data'

How to verify the site to site replication from SQL Server Management studio ?

Run the SQL query to check out Transmission Queue for a particular site (in my example it’s site PR1)

SELECT TOP 1000 *, casted_message_body =
 CASE message_type_name WHEN 'X'
 THEN CAST(message_body AS NVARCHAR(MAX))
 ELSE message_body
 END
 FROM [CM_CAS].[sys].[transmission_queue] where to_service_name = 'ConfigMgrDRS_SitePR1'