zfs discuss - Dec 2010 - How many files & directories in a ZFS filesystem?

Looking for a little help, please.  A contact from Oracle (Sun) 
suggested I pose the question to this email.

We''re using ZFS on Solaris 10 in an application where there are so many
directory-subdirectory layers, and a lot of small files (~1-2Kb) that we 
ran out of inodes (over 30 million!).

So, the zfs question is, how can we see how many files & directories 
have been created in a zfs filesystem?  Equivalent to "df -o i" on a
UFS
filesystm.

Short of doing a find <zfs-mount-point> | wc.

TIA.

-- 
David Strom

On 09 December, 2010 - David Strom sent me these 0,7K bytes:
> Looking for a little help, please.  A contact from Oracle (Sun)  
> suggested I pose the question to this email.
>
> We''re using ZFS on Solaris 10 in an application where there are so
many
> directory-subdirectory layers, and a lot of small files (~1-2Kb) that we  
> ran out of inodes (over 30 million!).
>
> So, the zfs question is, how can we see how many files & directories  
> have been created in a zfs filesystem?  Equivalent to "df -o i"
on a UFS
> filesystm.
>
> Short of doing a find <zfs-mount-point> | wc.
GNU df can show, and regular Solaris could too but chooses not to.
statvfs() should be able to report as well. In ZFS, you will run out of
inodes at the same time as you run out of space.

/Tomas
-- 
Tomas ?gren, stric at acc.umu.se, http://www.acc.umu.se/~stric/
|- Student at Computing Science, University of Ume?
`- Sysadmin at {cs,acc}.umu.se

On Thu, Dec 9, 2010 at 1:23 PM, David Strom <dstrom at
ciesin.columbia.edu> wrote:
> Looking for a little help, please. ?A contact from Oracle (Sun) suggested I
> pose the question to this email.
>
> We''re using ZFS on Solaris 10 in an application where there are so
many
> directory-subdirectory layers, and a lot of small files (~1-2Kb) that we
ran
> out of inodes (over 30 million!).
>
> So, the zfs question is, how can we see how many files & directories
have
> been created in a zfs filesystem? ?Equivalent to "df -o i" on a
UFS
> filesystm.
If you have gnu df, (it''s in /opt/sfw/bin/gdf if you''ve
installed the companion
CD), then that supports the -i flag.

Alternatively parse the output from df -g. I have a horrid script that does
something like that, fragment here:

echo "Filesystem        iused   ifree   %iused  Mounted on"
for ZF in ${FSLIST}
do
        OUT=`/usr/sbin/df -g ${ZF} | awk -F: ''{print $NF}''`
        NFILES=`echo $OUT | awk ''{print $15}''`
        NFREE=`echo $OUT | awk ''{print $18}''`
        NUSED=$(($NFILES-$NFREE))
        NPERC=$(((100*NUSED)/NFILES))
        SPACE=`/usr/sbin/df -k ${ZF} | nawk ''/%/{print $3}''`
        echo "${ZF}     $NUSED  $NFREE  ${NPERC}%       ${ZF}"
        echo "                  average $(($SPACE/$NUSED))k"
done

ZFS goes up to ridiculous number of files. Here''s one of ours
which has a fair number:

Filesystem      iused   ifree   %iused  Mounted on
/images/fred 140738056       36000718887     0%      /images/fred
                        average 11k

I''ve never seen ZFS run out of inodes, though.

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

On Dec 9, 2010, at 5:23 AM, David Strom wrote:
> Looking for a little help, please.  A contact from Oracle (Sun) suggested I
pose the question to this email.
> 
> We''re using ZFS on Solaris 10 in an application where there are so
many directory-subdirectory layers, and a lot of small files (~1-2Kb) that we
ran out of inodes (over 30 million!).
30 million files for ZFS is a walk in the park.  It doesn''t even get
interesting
until you get into the billions ;-)  As long as you have space, you have space
for more files.
 -- richard