Re: [List] Cannot find out what uses space in ZFS dataset

On 9/19/25 12:08, freebsd@vanderzwan.org wrote:

> What you could do is to find largest objects in the dataset using zdb:
> zdb -ddd zroot/ROOT/default 0:-1:A |sort -h -b -k 5 |tail
> 
> that should show you the largest objects in the dataset.
> First column is the object id which is also the inode number.
> 
> You can find more info on the objects using:
> zdb -ddd zroot/ROOT/default OBJECTID
> 
> You can try to find the name using :
> find / -xdev -inum OBJECTID

Here:

> # zdb -ddd zroot/ROOT/default 0:-1:A |sort -h -b -k 5 |tail
>     186544    2   128K   128K  31.3M     512  57.5M  100.00  ZFS plain file
>       5738    2   128K   128K  33.2M     512  51.9M  100.00  ZFS plain file
>          0    6   128K    16K  39.6M     512   176M   29.37  DMU dnode
>     186545    2   128K   128K  48.4M     512  93.5M   99.60  ZFS plain file
>     186426    2   128K   128K  53.1M     512   101M  100.00  ZFS plain file
>     186668    3   128K   128K  76.2M     512   178M  100.00  ZFS plain file
>     186209    3   128K   128K  91.9M     512   253M  100.00  ZFS plain file
>     186671    3   128K   128K   135M     512   327M  100.00  ZFS plain file
>     186427    3   128K   128K   140M     512   334M  100.00  ZFS plain file
>        360    3   128K   128K  58.8G     512  90.0G  100.00  ZFS plain file
> # zdb -ddd zroot/ROOT/default 360
> Dataset zroot/ROOT/default [ZPL], ID 89, cr_txg 8, 62.1G, 105870 objects
> 
>     Object  lvl   iblk   dblk  dsize  dnsize  lsize   %full  type
>        360    3   128K   128K  58.8G     512  90.0G  100.00  ZFS plain file
> 
> # find / -xdev -inum 360
> #

Does this make any sense to you?



Can it be that a process has opened a huge file, which was later 
deleted, but is still there due to the process being still alive?
Would du or the abobe find show this?
Any way to track either the file or the process?
(Just an hypotesis of course).

  bye & Thanks
	av.