Identifying Read/Write (I/O) Problems

scmaxyes

于 2015-01-14 09:56:00 发布

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分类专栏： SAP Performance Management

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本文介绍了通过SAP系统的操作监控工具ST06进行硬盘性能监控的方法，包括如何查看硬盘利用率、等待时间等关键指标，并提供了可能存在的I/O瓶颈判断标准。文章还指出，对于更详细的I/O问题分析，需要借助硬件制造商提供的工具。

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In the operating system monitor (Transaction ST06), in the analysis view (Snapshot • Disk)

Field	Explanation
Disk	Operating system name of the hard disk
Utilization (%)	Load on the hard disk (in %)
Queue Length	Number of processes waiting for I/O operations
Wait Time (ms)	Wait time (in msec)
Service Time (ms)	Service time (in msec)
Transfer (Kbyte/s)	Transfer rate (in Kbyte/second)
Operations (per Sec)	Number of I/O operations (per second)
Response Time (ms)	Average response times of the hard disk (in msec)

I/O bottleneck

If you determine via these monitors that individual drives are heavily loaded (LOAD (%) > 50%), a potential I/O bottleneck exists. However, you can gain only limited information about 1/0 problems from the SAP system. To perform a more detailed analysis, you need tools provided by the hardware manufacturer.