[Lustre-discuss] Interpreting stats files

[Scott Nolin]

Here's how I understand it:

First number = number of times (samples) the OST has handled a read or 
write.

Second number = the minimum read/write size

Third number = maximum read/write size

Fourth = sum of all the read/write requests in bytes, the quantity of 
data read/written.

Since this is in the exports area, it's all that per export of course.

I am working on a wiki page for sharing information on stats details 
like this which hopefully will be available soon, it's almost ready. It 
will include links to tools like lltop, xltop, and also how to roll your 
own.

Scott

On 11/7/2014 2:29 PM, Dragseth Roy Einar wrote:
> Is there a description of the stats file formats anywhere?
>
> I'm especially interested in the
>
> /proc/fs/lustre/obdfilter/*/exports/*/stats
>
> files.  For instance, what does the last three numbers on the read_bytes or write_bytes lines mean?
>
> [root at oss1 ~]# cat /proc/fs/lustre/obdfilter/uit-OST0009/exports/192.168.255.161 at o2ib/stats
> snapshot_time             1415391739.442581 secs.usecs
> read_bytes                365486 samples [bytes] 2720 1048576 363509372808
> write_bytes               12183 samples [bytes] 7384 1048576 12762602232
> preprw                    377677 samples [reqs]
> commitrw                  377669 samples [reqs]
> ping                      832 samples [reqs]
>
> (I'm trying to create a simple tool to scan all OSSes and detect the worst IO hogs on our system)
>
> Regards,
> Roy.
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