![]() ![]() When reverted from snapshot, USN will be reverted to old state. When creating an object on a DC for example, the USN will be incremented by 1 and hence, the DB -on this DC- will have a higher version number and that’s why any other DC will accept a replication from that DC. Long story short, each DC has to maintain a version number of its DB called “Invocation ID” as well as another sequence number called “Update Sequence Number – USN”. ![]() That’s because of a known issue called “USN Rollback” which leads to creating different objects on different DC’s with the same SID. This allowed us to use the next features: AD DC Snapshot and AD DC Cloning.Ģ-) AD DC Snapshot Support: Before Windows 2012, any try to use a snapshot with DC would lead to a corruption in DC database. This ID is saved in AD Computer Object attributes of the VM as “msDS-GenerationId Attribute” and that helps the AD to keep track of the VM version and if the VM is restored or reverted from different version. It changes only when the VM is either imported, deployed from a template or a copy, hot/cold cloned, hot/cold snapshot-ed, restored from a backup or replicated to another VM. When it’s power on for first time, a new ID is generated by VM BIOS and exposed using a special generator driver on Windows 2012 by default. These features are:ġ-) VM Generation ID (Virtualization Safeguard): An ID that’s generated and add to any Windows 2012 VM when being deployed on a supported hypervisor (vSphere 5.0 U2 and later). effort and to leverage all of Virtualization advantages and features. Luckily, some of these are only for helping virtualizing Domain Controllers (DC’s) with min. Being here since 1990’s, AD DS has been through a great development till reached this version on Windows 2012 with many new features. ![]() ![]() It’s the authentication and authorization center of any IT Infrastructure. Active Directory Domain Services (AD DS) is the core of our IT Infrastructure nowadays. ![]()
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