Imagine there would be no no effort to start a performance analysis for SVC or Storwize - and you can solve many problems with this. You download the small scanner application --> configure it in 2 minutes --> run it and leave it running for some days -> send the data -> receive an easy to understand report. This is the new BVQ Offline Scanner. You find a video here, that shows how easy to use it is.
The BVQ Offline scanner is a small stand alone application which allows you, to analyze a SVC or Storwize without the need of any installation. The time to make things running is only minutes.
The scanner should collect 10 days of data before you send us the results.
10 -14 day scan is good to prepare for any kind of analysis like risk analysis or IO density analysis for storage planning
5-7 day scan is still OK to prepare for a risk analysis
2 day scan can be used for performance bottleneck analysis (peak latency analysis) when the bottleneck happens in this time (Please inform us, when you need to find a performance bottleneck)
CPU and global cache: By analyzing the heart of the SVC / Storwize it can be determined if there is a risk of running into performance bottlenecks because of high system or compression CPU load. First information can be obtained with a look into the global RW and write cache. Overflow conditions occur because of peak loads or slow backend performance.
Local partition caches: In the case of overflow conditions in one of the storage pools they can be found with a detailed analysis of the inner data circulation of the SVC / Storwize. Issues can happen here because of massive writes into the caches. Sometimes they are uncontrolled and can be avoided by better load distribution. Another sign can be that the backend storage is no longer able to cover the load.
Node ports: The outer data circulation of the SVC / Storwize can be analyzed by regarding the load distribution across the ports. By checking the buffer credit wait % or the error indicators it can be determined, if the SAN traffic is interfered by external blockages. Asymetric usage of the node ports may lead to unexpected bottleneck situations, Many SAN errors are recognized by the storage systems and be uncovered with this analysis.
The BVQ offline scanner gallery
Some things can be as simple! Excellent results without any complexity!