some ZFS questions

Paul Kraus paul at
Sun Aug 24 17:04:01 UTC 2014

On Aug 24, 2014, at 6:19, Scott Bennett <bennett at> wrote:

> Paul Kraus <paul at> wrote:

>> When you create a zpool you get both the zpool and a zfs dataset of the same name. You can use this dataset, but if I am going to be creating *any* other datasets in this zpool I do not. I only use hierarchical datasets in very specific ways as there are rules on inheritance and mount points. For example:
>     Oh.  I hadn't gleaned that from the man pages or other documentation.
> Thanks for pointing it out.

It is not very obvious, and the downsides are decidedly not obvious. I learned to do what I now do through trail and error and many painful reconfigurations over the years. The biggest thing to watch out for is hidden (non-obvious) dependencies due to the hierarchical nature of datasets created within (on top of ?) other datasets. 

Paul Kraus
paul at

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