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Tag: HADR

Non-WSFC Dumping Woes – Assert in ucsconnectionsend.cpp

March 29, 2023 Sean Gallardy 5 Comments

Setup If you’re using availability groups with read-scale or linux (cluster type = None/External), you might want to watch the…

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Posted in: Dumps, HA/DR, SQL Server Filed under: Always On, Availability Groups, Dump, Dumps, HADR, linux, read-scale, SQL Server, WSFC

Cluster Resource DLL Connectivity In Availability Groups

March 11, 2023 Sean Gallardy

I was recently asked a question, while fixing a cluster connectivity issue, about how the cluster resource dll knows on…

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Posted in: HA/DR, Security, SQL Server Filed under: Always On, Availability Groups, HADR, NotReallyASQLProblem, ODBC, Security, SNAC, SQL Native Client, SQL Server, WSFC

Want To Remove SNAC 2012? Upgrade To SQL 2022

March 5, 2023 Sean Gallardy 1 Comment

I see many questions, and have been on the receiving end of many myself, about out of support items and…

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Posted in: HA/DR, SQL Server Filed under: Availability Groups, Drivers, FCI, HADR, ODBC, SNAC, SQL Native Client, SQL2022, SQLNCLI

When Using Availability Groups, Beware of Mirroring Behaviors

January 21, 2022 Sean Gallardy 7 Comments

Many DBAs haven’t had the experience of using database mirroring, since it was deprecated in 2012 when availability groups were…

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Posted in: HA/DR, SQL Server Filed under: App Compat, Drivers, HADR, Mirroring, SQL Server

Understanding the HADR_SYNC_COMMIT wait

September 22, 2021 Sean Gallardy 2 Comments

Initially I thought to myself, “this is the most misunderstood wait type that exists in the HA space for SQL…

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Posted in: HA/DR, SQL Server, Waits Filed under: AGs, Always On, Availability Groups, HADR, HADR_SYNC_COMMIT, Monitoring, SQL Server, Synchronous Commit, Threads, Wait Types, Waits

olved steries #1 – SQL FCI Failovers

April 29, 2021 Sean Gallardy 7 Comments

Overall Introduction I’ve had some feedback that people would like to know some of the stuff I see and how…

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Posted in: NotASQLServerProblem, Performance, Security, SQL Server Filed under: Always On, Cheater Cheater, Drivers, FCI, GottaLoveSecurity, HADR, IRPs, NotReallyASQLProblem, olved steries, Security, SQL Server, Windows IO

Availability Group Long Failover Times

April 18, 2021 Sean Gallardy 1 Comment

One of the most common issues I look at from day to day is some variation of the question. “Why…

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Posted in: CUs and GDRs, HA/DR, Performance, SQL Server Filed under: Antivirus, Availability Groups, Drivers, Failover, HADR, Patching, Performance, SQL Server

Do You Really Have A HA Issue?

March 15, 2021 Sean Gallardy

I tend to be involved in many HA related issues, as is the nature of my current work agreement. The…

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Posted in: HA/DR, Performance, SQL Server Filed under: HADR, Performance, Planning, SQL Server

VM Backups + SQL HA = SQL AlwaysOff

September 21, 2020 Sean Gallardy 1 Comment

On, Off, On, Off, On… I see this more often than I’d like to, so count this as your PSA…

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Posted in: HA/DR, Maintenance, NotASQLServerProblem, SQL Server Filed under: Backups, HADR, SQL Server, Veeam

Attempting to recycle all monitors that have loaded the DLL sqsrvres.dll or hadrres.dll and you notice a SQL FCI/AG failed health checks

August 20, 2020 Sean Gallardy

I won’t say I told you so… I will, however, point out common AG question #8… I’m not sure why…

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Posted in: HA/DR, Maintenance, NotASQLServerProblem, SQL Server Filed under: HADR, Patching, SQL Server, WSFC

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