things to consider STRETCHING SQL Server & Availability Groups Failover Clustered Instances Disaster Recovery Site

Transcription

1 things to consider STRETCHING Failover Clustered Instances to & Availability Groups Disaster Recovery Site

2 THANKS to all Sponsors! EVENT SPONSORS EXPO SPONSORS EXPO LIGHT SPONSORS

3 Meet me at the Community Zone After this session, you can speak with me in the Community Zone WE MIGHT Discuss additional questions Review parts of my session in more detail Network Take selfies

4 EDWIN SARMIENTO Microsoft MVP/Microsoft Certified Master:

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7 AFRAID whenever we are... it is because we DON T KNOW ENOUGH - Earl Nightingale -

8 let s START with

9 failover clustering how it works t r a d i t i o n a l 2-node cluster log data Windows Server Failover Cluster

10 failover clustering Application how it works t r a d i t i o n a l 2-node cluster log data Windows Server Failover Cluster

11 failover clustering Application how it works t r a d i t i o n a l 2-node cluster data log data *Availability Groups Windows Server Failover Cluster

12 what IS NOT commonly mentioned

13 failover clustering Application 1 2 how it works t r a d i t i o n a l 2-node cluster log data Windows Server Failover Cluster

14 failover clustering Application how it works t r a d i t i o n a l 2-node cluster log data QUORUM 4 Windows Server Failover Cluster

15 1 2 Application 5 3 log data log data QUORUM 4 DR site Windows Server Failover Cluster

16 1 Authentication & Failover log data QUORUM log DR site data Windows Server Failover Cluster

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19 1 2 Authentication & Failover Active Directory-integrated DNS zones log data QUORUM log DR site data Windows Server Failover Cluster

20 1 2 Authentication & Failover Active Directory-integrated DNS zones RegisterAllProvidersIP determines whether or not the IP addresses of all the provider IP address resources are registered *for multi-subnet/geographically dispersed clusters

21 default DNS client TTL value: 20 minutes 4 Windows Server Failover Cluster

22 1 2 Authentication & Failover Active Directory-integrated DNS zones HostRecordTTL Time To Live (TTL) in seconds to be set for the resource records published for the cluster name *for multi-subnet/geographically dispersed clusters

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24 1 2 3 Cluster Heartbeat Settings log data QUORUM log DR site data Windows Server Failover Cluster

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27 configuring cluster heartbeat settings to make sure that the cluster can communicate properly with all of the nodes even on different networks for health detection *for multi-subnet/geographically dispersed clusters

28 configuring cluster heartbeat settings SameSubnetDelay frequency of heartbeats sent on nodes in the same network subnet DEFAULT: 1 sec MAXIMUM: 2 sec

29 configuring cluster heartbeat settings SameSubnetThreshold missed heartbeats before a node is considered unavailable DEFAULT: 5 MAXIMUM: 120

30 configuring cluster heartbeat settings default threshold before possible downtime 5 sec cluster nodes in the same subnet

31 configuring cluster heartbeat settings CrossSubnetDelay frequency of heartbeats sent on nodes on different network subnet DEFAULT: 1 sec MAXIMUM: 4 sec *for multi-subnet/geographically dispersed clusters

32 configuring cluster heartbeat settings CrossSubnetThreshold missed heartbeats before a node on a different subnet is considered unavailable DEFAULT: 5 MAXIMUM: 120 *for multi-subnet/geographically dispersed clusters

33 configuring cluster heartbeat settings default threshold before possible downtime 5 sec *for multi-subnet/geographically dispersed clusters

34 1 2 3 SameSubnetDelay SameSubnetThreshold (default) CrossSubnetDelay: 3000 CrossSubnetThreshold: 7 default threshold before possible downtime across subnet: 21 sec 4 DR site Windows Server Failover Cluster

35 Windows Server 2016 Fault Domains Site awareness *for multi-subnet/geographically dispersed clusters

36 AD-DC1 AD-DC2 NODE A NODE B NODE C NODE D LowerQuorumPriorityNodeID PrimarySite (PreferredSite) PRODUCTION Data Center DRSite DR Data Center Windows Server Failover Cluster

37 Windows Server 2016 Fault Domains Site awareness CrossSiteDelay frequency of heartbeats sent on nodes on different sites DEFAULT: 1 MAXIMUM: 4 *for multi-subnet/geographically dispersed clusters

38 Windows Server 2016 Fault Domains Site awareness CrossSiteThreshold missed heartbeats before a node on a different site is considered unavailable DEFAULT: 20 MAXIMUM: 120 *for multi-subnet/geographically dispersed clusters

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40 Quorum Configuration log data QUORUM log data DR site Windows Server Failover Cluster

41 what about QUORUM

42 what about QUORUM majority VOTE wins *ALL NODES have a vote

43 what about QUORUM Node & File Share Majority *ALL NODES have a vote

44 what happens if you lose QUORUM *it depends on the version of Windows Server that you re running

45 *Quorum Configuration log data QUORUM log DR site data Windows Server Failover Cluster *Asymmetric Witness

46 Windows Server 2016 Fault Domains Site awareness Quorum Dynamic quorum drops votes from site that is not assigned as a preferred site *for multi-subnet/geographically dispersed clusters

47 AD-DC1 AD-DC2 NODE A NODE B NODE C NODE D PrimarySite (PreferredSite) PRODUCTION Data Center DRSite DR Data Center Windows Server Failover Cluster

48 AD-DC1 AD-DC2 NODE A NODE B NODE C NODE D PrimarySite (PreferredSite) PRODUCTION Data Center DRSite DR Data Center Windows Server Failover Cluster

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50 log data QUORUM log DR site data Windows Server Failover Cluster

51 Application log data QUORUM log DR site data Windows Server Failover Cluster

52 MultiSubnetFailover=True.NET Framework 4.5, 2012 and higher Application log data QUORUM log DR site data Windows Server Failover Cluster

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54 we need to speak to the domain, DNS & network administrators

55 not just for the databases but for the ENTIRE infrastructure Recovery Time Objective

56 things to consider STRETCHING Failover Clustered Instances & Availability Groups to a Disaster Recovery Site

57 EDWIN SARMIENTO Microsoft MVP/Microsoft Certified Master:

58 Please evaluate all sessions! QR / LINK on posters and in program