SOLVED How do I simulate deuplication?

[dairyengguy]

I know that I need to use the zdb -S command, but I am having issues with it.

When I run that and give it the name of my pool, I get an error:

zdb: can't open '<pool>': No such file or directory
​

I read somewhere to direct it to /data/zfs/zpool.cache using the -U switch, which will show me the info about that pool. I cannot seem to get the -S switch to work.

What am I doing wrong?

Thanks.

 

[dairyengguy]

The thread that I referenced is here:

https://forums.freenas.org/index.php?threads/zdb-is-broken.170/

 

[dairyengguy]

Figured it out. I was just structuring the command incorrectly. I need to use zdb -U /data/zfs/zpool.cache -S <poolname>

I am able to use all the other options (including the Simulate option) with this command structure.

 

[axadiw]

I've tried with this structure:

zdb -S -U /data/zfs/zpool.cache <pool_name> but instead of reduplication simulation, I've received these stats:

Dataset <pool_name> [ZPL], ID 2232, cr_txg 201679, 23.8G, 2352298 objects


I guess that this isn't what I would normally get from "zfs -S", right?