zfs discuss - Apr 2010 - Find out which of many FS from a zpool is busy?

Hi all,

sorry if this is in any FAQ - then I''ve clearly missed it.

Is there an easy or at least straight forward way to determine which of n ZFS 
is currently under heavy NFS load?

Once upon a time, when one had old style file systems and exported these as a 
whole iostat -x came in handy, however, with zpools, this is not the case 
anymore, right?

Imagine

zpool create tank ..... (many devices here)
zfs set sharenfs=on tank
zfs create tank/a
zfs create tank/b
zfs create tank/c
[...]
zfs create tank/z

Now, you have these lovely number of ZFS but how to find out which user is 
currently (ab)using the system most?

Cheers
Carsten

On 22/04/2010 15:30, Carsten Aulbert wrote:
> sorry if this is in any FAQ - then I''ve clearly missed it.
>
> Is there an easy or at least straight forward way to determine which of n
ZFS
> is currently under heavy NFS load?
DTrace Analytics in the SS7000 appliance would be perfect for this.
> Once upon a time, when one had old style file systems and exported these as
a
> whole iostat -x came in handy, however, with zpools, this is not the case
> anymore, right?
> Now, you have these lovely number of ZFS but how to find out which user is
> currently (ab)using the system most?
fstat might help but ultimately the question you are asking is one that 
the DTrace Analytics in the SS7000 appliance are perfect for.

-- 
Darren J Moffat

On Thu, Apr 22, 2010 at 3:30 PM, Carsten Aulbert
<carsten.aulbert at aei.mpg.de> wrote:
> Hi all,
>
> sorry if this is in any FAQ - then I''ve clearly missed it.
>
> Is there an easy or at least straight forward way to determine which of n
ZFS
> is currently under heavy NFS load?
>
> Once upon a time, when one had old style file systems and exported these as
a
> whole iostat -x came in handy, however, with zpools, this is not the case
> anymore, right?
fsstat?

Typically along the lines of

fsstat /tank/* 1

-- 
-Peter Tribble
http://www.petertribble.co.uk/ - http://ptribble.blogspot.com/

Hi

On Thursday 22 April 2010 16:33:51 Peter Tribble wrote:
> fsstat?
> 
> Typically along the lines of
> 
> fsstat /tank/* 1
> 
Sh**, I knew about fsstat but never ever even tried to run it on many file 
systems at once. D''oh.

*sigh* well, at least a good one for the archives...

Thanks a lot!

Carsten