Disk I/O

[csf]

Hello All,

On a Screenshots in www.zabbix.com I see the graph for disk IO.
To me it is very necessary same.
Whether can tell to me what Item I should for this purpose
to describe ?

OS-Agent: Linux
HDD: /dev/sda2 and /dev/sdb2.

Is item: vfs.dev.read[sda2,operations] correct ?
Ist Store value Delta (speed per second) correct ?

Must I install still SAR ?

Many Thanks in advance for the help.

Leonid.

[swaterhouse]

In linux ops (or operations) isnt a supported check. If it were the config you have would be what you wanted. If you search the forums you can get more info on it. It has been requested to add it to more platforms.

[csf]

In linux ops (or operations) isnt a supported check. If it were the config you have would be what you wanted. If you search the forums you can get more info on it. It has been requested to add it to more platforms.

Do you know when it can be approximately realized?

[rreilly]

vfs.dev.read[sda,operations] this works for me on linux... is this what you want ?

[csf]

Hello,

By me it works too, but I am not assured or this that, what I want
to receive. But I wish to receive activity of a disk.
And the last.
I should establish Store value as Delta (speed per second) or Delta (simple change) or As is ?
You could not show here the your graph ?
My is looks so: (See Attachment) with Store value: Delta (speed per second)

[uweiss]

This is only an addition for those who wants to get the "bytes/s" from a disc and not the raw sectors or operations.

It is very simple (if you know how to do it).

Here the configuration of the item:

Key:                      vfs.dev.read[sda]
Type of information:      Numeric (integer 64bit)
Units:                    B/s
Use multiplier:           Custom multiplier
Custom multiplier:        512
Flexible intervals (sec): No flexible intervals
Store value:              Delta (speed per second)
Show value:               As is

Short explanation:
In linux kernels (2.4 and newer) sectors have a size of 512 bytes. So we only have to multiply the received numbers of sectors with 512 and we have the transfer in bytes. I compared the values i get from my new item with the output from iostat and it seems to be correct.

Hope that helps
Urs

[csf]

Hello Urs,

In first thanks for the answer.
On record looks normally, but
on reading i have always "0".