sar io 争用

scan724

于 2015-03-03 09:11:58 发布

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本文介绍了sar工具中与磁盘I/O相关的性能指标，如tps、rd_sec/s、wr_sec/s等，并解释了如何通过这些指标评估磁盘的使用情况。当%util接近100%时，表示设备带宽已满，可能存在性能问题。低avgqu-sz值表示设备利用率高。

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<pre name="code" class="sql">      tps
                     Indicate the number of transfers per second that were issued to the device.  Multiple logical requests can be combined  into  a  single  I/O
                     request to the device. A transfer is of indeterminate size.

              rd_sec/s
                     Number of sectors read from the device. The size of a sector is 512 bytes.

              wr_sec/s
                     Number of sectors written to the device. The size of a sector is 512 bytes.

              avgrq-sz
                     The average size (in sectors) of the requests that were issued to the device.

              avgqu-sz
                     The average queue length of the requests that w

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