zfs discuss - Sep 2008 - I/O statistics on a per-filesystem basis?

Does anyone have a suggestion for a good way to monitor a ZFS pool on a
per-filesystem basis? The scenario is that we have a large zpool where many
developers get filesystems, and we want to be able to track which of those
filesystems are getting the heaviest usage.

--Mike
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Michael.Stalnaker at exponential.com said:
> Does anyone have a suggestion for a good way to monitor a ZFS pool on a
> per-filesystem basis? The scenario is that we have a large zpool where many
> developers get filesystems, and we want to be able to track which of those
> filesystems are getting the heaviest usage. 
The "fsstat" tool is useful for this, though not ZFS-specific. 
Here''s
a one-liner you could put in crontab every 5 minutes or so, collecting
the output in a file somewhere (sh/ksh/bash syntax):

  fsstat $(zfs list -H -o mountpoint -t filesystem | egrep
''^/'') 2 20

Regards,

Marion

Marion Hakanson wrote:
> Michael.Stalnaker at exponential.com said:
>   
>> Does anyone have a suggestion for a good way to monitor a ZFS pool on a
>> per-filesystem basis? The scenario is that we have a large zpool where
many
>> developers get filesystems, and we want to be able to track which of
those
>> filesystems are getting the heaviest usage. 
>>     
>
> The "fsstat" tool is useful for this, though not ZFS-specific. 
Here''s
> a one-liner you could put in crontab every 5 minutes or so, collecting
> the output in a file somewhere (sh/ksh/bash syntax):
>
>   fsstat $(zfs list -H -o mountpoint -t filesystem | egrep
''^/'') 2 20
>   
Sorry can''t help but add this for completeness tcsh syntax.. (should 
also work for bash?)  Nice one liner. thanks.

fsstat `zfs list -H -o mountpoint -t filesystem | egrep ''^/''`
2 20


./C

Thanks, Marion. That''s exactly what I needed.



On 9/15/08 6:20 PM, "Marion Hakanson" <hakansom at ohsu.edu>
wrote:
> Michael.Stalnaker at exponential.com said:
>> Does anyone have a suggestion for a good way to monitor a ZFS pool on a
>> per-filesystem basis? The scenario is that we have a large zpool where
many
>> developers get filesystems, and we want to be able to track which of
those
>> filesystems are getting the heaviest usage.
> 
> The "fsstat" tool is useful for this, though not ZFS-specific. 
Here''s
> a one-liner you could put in crontab every 5 minutes or so, collecting
> the output in a file somewhere (sh/ksh/bash syntax):
> 
>   fsstat $(zfs list -H -o mountpoint -t filesystem | egrep
''^/'') 2 20
> 
> Regards,
> 
> Marion
> 
>

Marion Hakanson wrote:
> Michael.Stalnaker at exponential.com said:
>> Does anyone have a suggestion for a good way to monitor a ZFS pool on a
>> per-filesystem basis? The scenario is that we have a large zpool where
many
>> developers get filesystems, and we want to be able to track which of
those
>> filesystems are getting the heaviest usage.
>
> The "fsstat" tool is useful for this, though not ZFS-specific. 
Here''s
> a one-liner you could put in crontab every 5 minutes or so, collecting
> the output in a file somewhere (sh/ksh/bash syntax):
>
>    fsstat $(zfs list -H -o mountpoint -t filesystem | egrep
''^/'') 2 20
Note that this appears to _not_ capture mmap''d I/O (or there''s
some
other bug...). My extremely busy RRD stat collector shows zero writes in 
fsstat. "zpool iostat" shows reality... but only at the pool level.

-- 
Carson