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Tag: Availability Groups

Read Scale Availability Group – Failed to update Replica status due to exception 35222.

November 21, 2023 Sean Gallardy Leave a comment

Read Scale Availability Groups can be pretty useful in the right places and for the right things and were a…

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Posted in: DMVs, HA/DR, SQL Server Filed under: Always On, Availability Groups, benign, HADR, read-scale, SQL Server, Weird Errors, WSFC

Storage Testing – Cheap and Fast?!

November 18, 2023 Sean Gallardy 2 Comments

I’ve been playing around with some different NVMe drives lately, looking at different performance characteristics and when I saw the…

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Posted in: Hardware, Storage Filed under: Always On, automatic Seeding, Availability Groups, HADR, hardware, nvme, SQL Server, ssd, Storage, Windows Server

SQL Server 2022, Distributed Availability Groups, and FileStream

August 27, 2023 Sean Gallardy 2 Comments

I don’t often find many people using FileStream in their databases (which isn’t a bad or good thing, in my…

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Posted in: HA/DR, SQL Server, Trace Flags Filed under: Always On, Availability Groups, Distributed Availability Groups, HADR, SQL Server, trace flag

model_msdbdata and log, model_replicatedmaster and log – What are they?

July 3, 2023 Sean Gallardy 4 Comments

There was a question that came up on the MCM mailing list about what are these files: model_msdbdata.mdf, model_msdblog.ldf, model_replicatedmaster.mdf,…

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Posted in: DMVs, HA/DR, SQL Server Filed under: Availability Groups, general, HADR, SQL Server, SQL2022

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

SQL Server 2022 – Contained AGs – Overview

May 24, 2022 Sean Gallardy 1 Comment

You’ve Asked, It’s Now Here! The largest complaint, by far, for Availability Groups (AG) has been that system databases could…

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Posted in: HA/DR, SQL Server Filed under: Availability Groups, Contained AGs, SQL Server, SQL2022

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

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

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