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Today, I will talk to you about how to monitor the performance of disk IO, which may not be well understood by many people. in order to make you understand better, the editor has summarized the following for you. I hope you can get something according to this article.

How to check the size of disk space under the windows command line

Article classification: the operating system views all

Wmic DiskDrive get Size / value

:: view disk C

Wmic LogicalDisk where "Caption='C:'" get FreeSpace,Size / value

:: view D disk

Wmic LogicalDisk where "Caption='D:'" get FreeSpace,Size / value

The IO performance of the disk is an important index to measure the overall performance of the computer. Linux provides iostat commands to obtain disk input / output (that is, IO) statistics, while Windows provides a WMI interface that allows you to write a simple script to get the equivalent of iostat.

1. Iostat command under Linux

Iostat-d-k-t 2

The disk IO information is counted every 2 seconds until the program is terminated by Ctrl+C, the-d option indicates the statistical disk information,-k indicates that it is displayed in the form of KB per second,-t requires that the time information be printed, and 2 means that it is output every 2 seconds. The disk IO load status of the first output provides statistics since the system was started. Each subsequent output is the average IO load between each interval.

After running the command, output:

Linux 2.6.9-67.0.7.ELsmp (localhost.localdomain) 11 Universe 19 Universe 2008

Time: 03:15:25 PM

Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn

Sda 3.53 26.66 54.76 30122033 61864280

Sda1 0.51 1.07 1.73 1207649 1949740

Sda2 0.00 0.00 0.00 538 256

Sda3 13.84 25.59 53.03 28913291 59914092

Time: 03:15:27 PM

Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn

Sda 275.38 0.00 1738.69 0 3460

Sda1 14.57 0.00 58.29 0 116

Sda2 0.00 0.00 0.00 00

Sda3 419.60 0.00 1678.39 0 3340

...

Time information is printed for each output, followed by a list of disk IO conditions.

Device: displays the disk name

Tps: represents the number of transfers per second output to the physical disk. A transfer is an Icano request to a physical disk. A plurality of logical requests can be combined as a single Ipicuro request to the disk. The transmission has a medium size.

KB_read/s: the amount of data read from disk per second, in KB.

KB_wrtn/s: the amount of data written to disk per second, in KB.

Kb_read: total number of KB read.

Kb_wrtn: total number of KB written.

2. Win32_PerfFormattedData_PerfDisk_LogicalDisk object in WMI

Win32_PerfFormattedData_PerfDisk_LogicalDisk represents the logical disk performance data object, which can be used to obtain the mental information of the disk. The Win32_PerfFormattedData_PerfDisk_LogicalDisk object has the following main properties:

Name: disk name

DiskTransfersPerSec: number of disk transfers per second.

DiskReadBytesPerSec: the amount of data read from disk per second, in Byte.

DiskWriteBytesPerSec: the amount of data read from disk per second, in Byte.

PercentFreeSpace: percentage of disks available.

3. Points for attention when using Win32_PerfFormattedData_PerfDisk_LogicalDisk

When using Win32_PerfFormattedData_PerfDisk_LogicalDisk, you should be aware of:

(1) you cannot use objWMIService.ExecQuery to execute Select statements to obtain disk performance data.

(2) you must use WbemScripting.SWbemRefresher to add Win32_PerfFormattedData_PerfDisk_LogicalDisk, and then constantly call the Refresh method to refresh data to obtain performance information.

(3) during the first refresh, the useful data can not be obtained, but the disk performance data can only be obtained from the second time.

(4) the above problems are related to the mechanism of performance monitoring using counters in WMI.

4. Use examples

In order to provide a good user interface for monitoring disk performance, VBScript can be used to write scripts to obtain disk performance data. The code for the script is as follows:

'Script. File Name: DiskMonitor.vbs

StrComputer = "."

Set bjWMIService = GetObject ("winmgmts:" _

& "{impersonationLevel=impersonate}!\" & strComputer & "\ root\ cimv2")

Set bjRefresher = CreateObject ("WbemScripting.SWbemRefresher")

Set colDisks = objRefresher.AddEnum (objWMIService, "Win32_PerfFormattedData_PerfDisk_LogicalDisk") .objectSet

If Wscript.Arguments.Count = 0 Then

ObjRefresher.Refresh

For Each objDisk in colDisks

Wscript.Echo objDisk.Name & "& objDisk.DiskReadBytesPerSec &" & objDisk.DiskWriteBytesPerSec

Next

End If

If Wscript.Arguments.Count = 1 Then

Interval = CInt (Wscript.Arguments (0)) * 1000

Do While True

ObjRefresher.Refresh

Wscript.Echo

Wscript.Echo "Time:" & "& Time ()

Wscript.Echo FormatStr ("Device:", 15,0) & FormatStr ("tps", 7,1) & FormatStr ("kB_read/s", 13,1) & FormatStr ("kB_wrtn/s", 13,1) & FormatStr ("Free Space", 13,1)

For Each objDisk in colDisks

Wscript.Echo FormatStr (objDisk.Name, 15,0) & FormatStr (objDisk.DiskTransfersPerSec, 7,1) & FormatStr (objDisk.DiskReadBytesPerSec, 13,1) & FormatStr (objDisk.DiskWriteBytesPerSec, 13,1) & FormatStr (objDisk.PercentFreeSpace & "%", 13,1)

Next

Wscript.Sleep Interval

Loop

End If

If Wscript.Arguments.Count = 2 Then

I = 0

Interval = CInt (Wscript.Arguments (0)) * 1000

Count = CInt (Wscript.Arguments (1))

Do While i < Count

ObjRefresher.Refresh

Wscript.Echo

Wscript.Echo "Time:" & "& Time ()

Wscript.Echo FormatStr ("Device:", 15,0) & FormatStr ("tps", 7,1) & FormatStr ("kB_read/s", 13,1) & FormatStr ("kB_wrtn/s", 13,1) & FormatStr ("Free Space", 13,1)

For Each objDisk in colDisks

Wscript.Echo FormatStr (objDisk.Name, 15,0) & FormatStr (objDisk.DiskTransfersPerSec, 7,1) & FormatStr (objDisk.DiskReadBytesPerSec, 13,1) & FormatStr (objDisk.DiskWriteBytesPerSec, 13,1) & FormatStr (objDisk.PercentFreeSpace & "%", 13,1)

Next

Wscript.Sleep Interval

I = I + 1

Loop

End If

Function FormatStr (str, tLen, direction)

SLen = Len (str)

FStr = ""

Num = tLen-sLen

J = 0

Do While j < num

FStr = fStr & ""

J = j + 1

Loop

If direction = 1 Then

FStr = fStr & str

Else

FStr = str & fStr

End If

FormatStr = fStr

End Function

Examples of use:

(1) CSCript. DiskMonitor.vbs

If you do not refresh the Win32_PerfFormattedData_PerfDisk_LogicalDisk object once, you will not get useful data.

(2) CSCript. DiskMonitor.vbs 2

Get disk performance data every 2 seconds and output it until you press Ctrl+C to terminate the program.

(3) CSCript. DiskMonitor.vbs 2 100

Disk performance data is taken and output every 2 seconds for a total of 100 times, and then the output information includes DiskTransfersPerSec, DiskReadBytesPerSec, DiskWriteBytesPerSec, and PercentFreeSpace.

After reading the above, do you have any further understanding of how to monitor disk IO performance? If you want to know more knowledge or related content, please follow the industry information channel, thank you for your support.

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