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Would you rather wait for something to become a problem, or do some performance tweaking and optimization to avoid downtime or performance headaches altogether? The answer to that is easy, but deciding what to optimize or troubleshoot isn't always obvious. In this post we'll cover some common areas where you can use Red Hat Insights and its Advisor service to solve problems before they start.
It’s all about the performance!
Performance tuning and monitoring are some of the most important tasks Red Hat Enterprise Linux (RHEL) system administrators perform, along with patching. As many sysadmins know, incremental performance improvements can accumulate to deliver significant cost savings in resources that over time translate to significant business gains. Avoiding degradation of service or downtime may be even more valuable.
Using some of the recommendations in this post may help save you money and time. However, knowing what can prevent downtime is not always obvious, so many sysadmins have come to rely on the performance recommendations directly from Red Hat Insights for Red Hat Enterprise Linux (RHEL).
Advisor: The heart and brain of Red Hat Insights
Red Hat Insights was built on the lessons and experience of Red Hat experts working directly with customers and products over the past 20-some years. Red Hat Insights provides continuous, in-depth analysis of registered Red Hat Enterprise Linux systems and it is included as part of your Red Hat Enterprise Linux subscription. Insights helps identify risks to your business, operations and security specifically based on how your systems are configured and performing.
The Advisor service is both the heart and brain, providing warnings and recommendations based on best practices and known problematic configurations. Some users have referred to Insights as "like having an extra person on the team." Advisor recommendations are the composite of best practices and analytics over thousands of systems where the metrics across a variety of performance metrics can be taken into account.
This post covers a variety of new Advisor recommendations recently released for performance tuning across key areas that can have a significant impact on improving your daily operations.
Get tuned in: RHEL 8 Performance tuning guide
First, we started by analysing the performance tuning guide for RHEL 8. We have turned several aspects of this guide into automated recommendations, offering Insights users tailored instructions on how to fine-tune their RHEL 8 for best performance. Mainly to help identify the most appropriate tuned profile, configure the dynamic tickless option on latency-sensitive workloads, or to enable vhost_net kernel feature to optimize VM network performance.
RHEL 8 Tuning recommendations1:
Performance takes a team: Performance Co-Pilot
We now have new Advisor recommendations using metrics captured by Performance Co-Pilot (PCP), providing an additional level of performance monitoring. We developed these in close collaboration with the engineers working on PCP.
The collaboration proved successful and as a result we have published a SYN flood traffic recommendation that leverages PCP data to detect a SYN flood attack. In order to get this working, the PCP team had to implement a new rule into their pmie service (part of the PCP project) to send appropriate log entries into /var/log/messages. These are subsequently picked up by the Insights client and processed by Advisor.
The team went even further, and built even more recommendations taking advantage of this integration - detecting applications using insufficient entropy pool for crypto operations, network connectivity loss after the system reboots, and/or performance issues when using a limited swap size.
Microsoft SQL Server performance best practices
By analysing the Microsoft SQL Server performance best practices we have identified two important recommendations to prevent performance degradation. They both assist sysadmins with configuring crucial parameters on network configuration and mount parameters. In both cases it can lead to performance degradations of the SQL Server when running on top of RHEL.
Microsoft SQL Server recommendations:
Avoid Azure performance degradation
There are several new recommendations for Azure including helping users to prevent performance degradations when running RHEL in the Azure public cloud.
Advisor now proactively detects a known performance issue in kernel when a VM uses hv_netvsc driver with IP forwarding mode, or when NICs go down after the system resumes from the hibernation state. Furthermore, Advisor offers a remediation for failures in monitoring and start operations when using the azure-lb resource agent in a Pacemaker cluster.
Optimal Insights client experience
Last but not least, Advisor can now also help Insights users with configuring their Insights client for an optimal experience. To accomplish this we have implemented two recommendations. One that helps customers keep their Insights client updated, receiving the latest bug fixes and another providing required data to the most recent recommendations. Second, we guide Insights users to use our advanced data collection mechanism, enabling Advisor to provide more detailed recommendations.
Insights client recommendations:
No matter which applications you run, including mission-critical applications like SQL Server and SAP, we all know that performance matters.
But we sometimes forget that a small gain of one tenth of a second can then multiply across servers and over time. With customer facing applications this can have more dramatic impact on perception and revenue as many application experts point out. Red Hat Insights is committed to delivering recommendations to reduce operations, security and business risks across your systems. Improve your system performance and start saving time today by getting started with Red Hat Insights.
About the author
With more than 10 years of experience in the software industry, Stefan Bunciak is currently the Product Manager for Red Hat Insights. He completed his master's degree in Informatics at Masaryk University in Brno and is skilled in project and people management, quality engineering, and software development. In his spare time, he plays violin in a folklore band.