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Comments on: SQL Server Diagnostic Information Queries Detailed, Day 11 https://www.sqlskills.com/blogs/glenn/sql-server-diagnostic-information-queries-detailed-day-11/ Semi-random musings about SQL Server performance Thu, 13 Apr 2017 19:28:45 +0000 hourly 1 https://wordpress.org/?v=6.9.4 By: Glenn Berry https://www.sqlskills.com/blogs/glenn/sql-server-diagnostic-information-queries-detailed-day-11/#comment-218825 Thu, 06 Oct 2016 20:26:17 +0000 http://3.209.169.194/blogs/glenn/?p=1034#comment-218825 In reply to Mark.

It applies to all types of latency. The latency that shows up here is for everything that has touched any SQL Server database files on that drive, since SQL Server has been running. Your normal workload, backups, index maintenance, etc.

104ms for reads is higher than I would like to see. Lower is always better for these numbers.

]]> By: Mark https://www.sqlskills.com/blogs/glenn/sql-server-diagnostic-information-queries-detailed-day-11/#comment-218822 Thu, 06 Oct 2016 19:06:38 +0000 http://3.209.169.194/blogs/glenn/?p=1034#comment-218822 Hi Glenn,

Question on Query #24 Drive Level Latency. Does the 20-25ms apply to all types of latency – Read, Write and Overall or just Overall Latency? For example, when running the query on one our servers I am seeing:

Drive Read Latency Write Latency Overall Latency
G: 104 1 17

Is the optimal result to see values below 20ms in each category?

Thanks so much for making these available. I have learned tons and have solved a few problems along the way. Still have a long way to go though 🙂

Thanks,
Mark

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