how to measure the I/O activities of specific disks

[kivallee]

Hi, there
I’m a new user of mac, I desire to resolve a problem : measuring the I/O activities of specific disks.
my structure is blow :
MBA mid 2012
disk0: internal SSD on MBA
disk1: SSD on the usb3.0 enclosure
disk2: traditional SATAIII hard disk on the usb3.0 enclosure

I store the virtual machine on the disk1 and run it by the "parallels desktop 10" on MAC. I run some programs like downloading files, BT…etc. But the destination of downloading files is the disk2.
I desire to measure the I/O activities and that how much data to write and read on disk0, disk1 and disk2.
I have tried some tools like the iostat, iotop, and the building tools of MAC, but the results are not satisfied me.
Could give me any advise to figure out this issue?

PS. I don’t know how to write the scripts…so those ways need to run by scripts are not good to me.

Thanks a lot!

Kival

 

[Weaselboy]

iostat

fs_usage

Look at this article on Fusion drives and their usage of the two commands above to read disk activity.

Check out Apple's documention of those commands here.

 

[Gadominas]

I/O stat every second:

iostat -d -w 1

That should work.

 

[kivallee]

Hello, Gadominas,
thanks, but the "iostat -d -w 1" just shows the count of transfer, I still don't know the quantities of write and read.

          disk0 
    KB/t tps  MB/s 
   23.94  11  0.26 
    4.00   1  0.00 
    4.00   6  0.02 
    4.00   1  0.00 
    0.00   0  0.00 
    0.00   0  0.00 
    4.00   1  0.00 
    0.00   0  0.00 
    4.00   1  0.00

I/O stat every second:

iostat -d -w 1

That should work.

 

[Gadominas]

worth to check - http://exchange.nagios.org/director...nux/check_iostat--2D-I-2FO-statistics/details

 

[kivallee]

Hi, Gadominas, thanks for your help.
I have tried it, but so sad, it doesn't work on MAC terminal. It seems the script used the iostat on linux, and the iostat on MAC doesn't run with the -k, -x parameters.

worth to check - http://exchange.nagios.org/director...nux/check_iostat--2D-I-2FO-statistics/details