loadrunner what could be the bottleneck for below System Summary Hi io /sec ....

[BC Nahsrahdus Dis]

what could be the bottleneck for below System Summary Hi io /sec . Food for thought .

 

[Sunit Sethi]

I assume it is on DB Server - then it looks fine to me ... since the queries might be accessing disk and good volume of data; If it is deviated from baseline results, the cause might be too many inserts and updates & the DB needs statistics update, or index rebuild on larger tables. Or some query not running with tuned indexes. If this is on the App server, & the application is either a very heavy weight rich application, and server is pushing too many JS to the clients. It all depends!

 

[Sagar Aggarwal]

Did you check IOwait? May be IO activities for wait is increasing

 

[Kranthi Paidi]

Be it App or DB, the spike tells that it is serving records/files with good amount of hard/soft page faults. But, The flat line after 01:05 - Caching or intentional "no load"?

 

[James Pulley]

How do you know this is a bottleneck. do you have a long response time to cross with this at the same time? Also, you may want to break out the IO. You have disk, you have network and you have other IO such as serial interfaces that could be the issue. It would be good to understand what is the source of the IO. You also don't have a correlating curve with CPU, so this appears to be less i/o interrupts per second, which would drive the system component of CPU higher, but perhaps I/O bytes second. Bytes would tend to have a correlating disk or CPU component. For instance, you could have a small test data set which is exhausted after the first hour and then after that it is being pulled from cache instead of hitting disk, therefore reducing IO bytes per second.

 

[BC Nahsrahdus Dis]

yes James i have long response time step download time erorr .

 

[BC Nahsrahdus Dis]

you are right I am in the process of breaking IO in all interfaces . but the cpu looks under threshold . need to investigate thanks for you reply .