第一类,机械磁盘(Hard Disk Driver),也称为硬盘驱动器,通常缩写为 HDD。机械磁盘主要由盘片和读写磁头组成,数据就存储在盘片的环状磁道中。在读写数据前,需要移动读写磁头,定位到数据所在的磁道,然后才能访问数据。 如果I/O 请求刚好连续,那就不需要磁道寻址,自然可以获得最佳性能。这其实就是我们熟悉的,连续 I...
%util Percentage of CPU time during which I/O requests were issued to the device (bandwidth utilization for the device). Device saturation occurs when this value is close to 100%. 一秒中有百分之多少的时间用于I/O操作,或者说一秒中有多少时间I/O队列是非空的。如果%util接近100%,表明I/O请求太...
rxmcst/s: Number of multicast packets received per second. %ifutil: Utilization percentage of the network interface. For half-duplex interfaces, utilization is calculated using the sum of rxkB/s and txkB/s as a percentage of the interface speed. For full-duplex, this is the greater of rxk...
Recall that disk devices have names like /dev/sda, the first SCSI subsystem disk. This kind of block device represents the entire disk, but there are many different components and layers inside a disk. 请记住,磁盘设备的名称类似于/dev/sda,表示第一个SCSI子系统磁盘。 这种块设备表示整个磁盘,但...
Percentage of CPU utilization that occurred while executing at the system level (kernel). Note that this field does NOT include time spent servicing hardware or software interrupts. %iowait Percentage of time that the CPU or CPUs were idle during which the system had an outstanding disk I/O ...
%util:Percentage of CPU time during which I/O requests were issued to the device (bandwidth utilization for the device). Device saturation occurs when this value is close to 100%. 在统计时间内所有处理IO时间,除以总共统计时间。例如,如果统计间隔1秒,该设备有0.8秒在处理IO,而0.2秒闲置,那么该设备...
%utilization" } ], "condition": "IsAggregate=TRUE", "class": "Processor" }, { "unit": "Bytes", "type": "builtin", "counter": "UsedSpace", "counterSpecifier": "/builtin/FileSystem/UsedSpace", "annotation": [ { "locale": "en-us", "displayName": "Used disk space on /" }...
%util:磁盘处理 I/O的时间百分比。(Percentage of elapsed time during which I/O requests were issued to the device (bandwidth utilization for the device). Device saturation occurs when this value is close to 100%.) 9. sar // -n 后面还可以接 DEV, EDEV, NFS, NFSD, SOCK, IP, EIP, ICM...
Use%: The percentage of the disk’s space in use. Mounted on: Shows the mount point for each drive (physical and virtual). This entry also includes temporary drives. TheFilesystementry covers all attached physical and virtual devices, including processes. Here’s a brief description of the ...
cpu.guest:Percentage of time spent by the CPU or CPUs to run a virtual processor. cpu.iowait:Percentage of time that the CPU or CPUs were idle during which the system had an outstanding disk I/O request. cpu.irq:Percentage of time spent by the CPU or CPUs to service hardware interrupts...