如何监控 Linux 中特定设备或挂载点的读写速度，例如/dev/sdc2挂载到哪个/mnt/data/？
例如，希望以 MB/s 为单位显示速度，并每秒更新一次或两次。
答案1
iostat是您的事实来源，特别是iostat -md /dev/devicename 1对于您的用例。
-m Display statistics in megabytes per second.
-z Tell iostat to omit output for any devices for which there was no activity during the sample period.
root@kahnbox:/home/kahn$ iostat -md /dev/sda 1
Linux 5.4.17-100.fc30.x86_64 (kahnbox) 31/07/20 _x86_64_ (4 CPU)
Device tps MB_read/s MB_wrtn/s MB_read MB_wrtn
sda 4.61 0.00 0.12 2521 152976
Device tps MB_read/s MB_wrtn/s MB_read MB_wrtn
sda 3.00 0.00 0.04 0 0
Device tps MB_read/s MB_wrtn/s MB_read MB_wrtn
sda 0.00 0.00 0.00 0 0
tps: Indicate the number of transfers per second that were issued to the device. A transfer is an I/O request to the device. Multiple logical requests can be combined into a single I/O request to the device. A transfer is of indeterminate size.
我更喜欢-z旗帜，因为它会减少喋喋不休。通过在命令末尾包含1，只要可以提供结果，您每秒都会获得结果。
如果您想安装此实用程序，则需要获取该sysstat软件包：
root@kahnbox:/home/kahn$ yum whatprovides iostat
Last metadata expiration check: 1:32:20 ago on Fri 31 Jul 2020 13:44:22 EDT.
sysstat-11.7.3-3.fc30.x86_64 : Collection of performance monitoring tools for Linux
Repo : @System
Matched from:
Filename : /usr/bin/iostat
sysstat-11.7.3-3.fc30.x86_64 : Collection of performance monitoring tools for Linux
Repo : fedora
Matched from:
Filename : /usr/bin/iostat
答案2
我认为这iostat是实现此目的的首选工具。例子：
iostat -d -t -p sdc 1 2
sdc该命令以1秒的间隔打印两次速度信息。