Windows Server 2016Cloud building brickLjubo BrodarićSiemens CVC

Agenda

• Cluster Operating System Rolling Upgrade

• Cloud Witness

• Cluster Compute Resiliency

• Workgroup and Multi-domain clusters

• Storage Replica

• Storage Spaces Direct (S2D)

Cluster OS Rolling Upgrade (1)• Adding node with next version of OS into existing

cluster

• Most wanted and criticized feature‐ Migration upgrade only option until now

‐ Hyper-V platform suffered most

• No need to stop the cluster

• No need for new hardware or cluster

Cluster OS Rolling Upgrade (2)• Node has to be reinstalled (in-place upgrade not

supported or recommended)

• Simple roll-back in case of any problems‐ ClusterFunctionalLevel

• Upgrade of all nodes should be done in reasonable time

• Microsoft support 4 weeks after upgrade starts

• Hyper-V, SOFS and all other clusters

• Windows Server 2012 R2 only

Cluster OS Rolling Upgrade (3)

Tranzicijska stanja prilikom nadogradnje klastera

DemoCluster Operating System Rolling Upgrade

Cloud Witness (1)

• Additional vote in cluster for achieving quorum

‐ Necessary for split-brain scenario

• Azure blob storagea used‐ Third location problem removed

• Very important for streched clusters

‐ File Share Witness used so far

Cloud Witness (2)

• Azure Storage Account required‐ One for many clusters

‐ Geo-redundancy must be disabled

• Azure VM not needed for File Share Witnessa

• Cheap‐ Small amount of data

‐ Incremental Sequence Number stored only

• Internet access required

Cloud Witness (3)

• Since Windows Server 2012 R2 witness should be allways configured

‐ Dynamic Witness

• All clusters without shared storage‐ SQL Always On, Exchange DAG, virtual clusters

hosted in Azureu or private cloud

DemoCloud Witness

Cluster Compute Resiliency (1)• Resiliency to transient failures

• Network is the most common reason

• Cluster should react ASAP, but…

• Two types of resiliency‐ Node Isolation

‐ Node Quarantine

Cluster Compute Resiliency (2)

Node Isolation

• VMs or any other resources continue to run even when a node falls out of cluster membership

• Cluster waits 4 minutes before roles drain

Cluster

?

?

?Network

CommunicationFailure

Cluster Compute Resiliency (3)

Node Quarantine

• Unhealthy nodes are quarantined and are no longer allowed to join the cluster

‐ Prevents flapping nodes from negatively effecting the cluster

‐ If node ungracefully leaves the cluster three times within an hour

‐ Roles gracefully drained

• QuarantineDuration: 2 hours

• QuarantineState: Node read only

QuarantinedCluster

Workgroup and Multi-domain clusters (1)• Single-domain Clusters: Clusters with all nodes

joined to the same domain

• Multi-domain Clusters: Clusters with nodes which are members of different domains

• Workgroup Clusters: Clusters with nodes which are member servers / workgroup (not domain joined)

Workgroup and Multi-domain clusters (2)• Consistent local administrator accounts on all

nodes of the cluster must exist

• DNS suffix must be configured for all nodes

• Witness must be Cloud Witness or Disk Witness

• Power Shell management only

http://blogs.msdn.com/b/clustering/archive/2015/08/17/10635825.aspx

Workgroup and Multi-domain clusters (3)

Technical Preview 3 Workload Support

Cluster workload Status More Information

SQL Server Supported We recommend that you use SQL Server Authentication.

File Server Supported, but not recommended

Kerberos (which is not available) authentication is the preferred authentication protocol for Server Message Block (SMB) traffic.

Hyper-V Supported, but not recommended

Live migration is not supported. Quick migration is supported.

DemoWorkgroup Cluster

Storage Replica (1)

• Ent to End Microsoft Disaster Recovery solution

• Block-level, volume-based Synchronous & Asynchronous SMB3 transport

• Any Windows volume, Any fixed disk storage, Any storage fabric

• Hardware agnostic: Storage Spaces, SAN (FC or iSCSI), DAS...

• Management: Power Shell, Failover Cluster Manager

Storage Replica (2)

Data

2

Application

Source

1

Log

5

t 2

Data

Destination

Log

t 3

4

1

Data

4

Application

Source

1

Log

3

t 2

Data

Destination

Log

t 5

6

1

Synchronous replica

Asynchronous replica

Storage Spaces Direct - S2D• Storage Spaces Direct is an evolution of Storage

Spaces

• Storage Spaces Direct leverages SMB3 for all intra-node (aka east-west) communication

‐ SMB Direct and SMB Multichannel

Storage Spaces Direct - S2D

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