some ZFS questions

Scott Bennett bennett at
Sun Aug 24 10:19:52 UTC 2014

Paul Kraus <paul at> wrote:
> On Aug 21, 2014, at 6:33, Scott Bennett <bennett at> wrote:
> > Paul Kraus <paul at> wrote:
> >> How much does the geli encryption cost in terms of space and speed? Is there a strong reason to not encrypt ALL the data? It can be in different zfs datasets (the ZFS term for a filesystem). In fact, I am NOT a fan of using the base dataset that is created with every zpool; I always create addition zfs datasets below the root of the zpool.
> > 
> >     Copying a file from one .eli partition to another can easily run up
> > to 25% on each of two cores of a Q6600.
> >     I didn't realize that there would be a "base data set"; I thought that
> > one had to create at least one file system or zvol in a pool in order to
> > use the space at all.
> 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.

                                  Scott Bennett, Comm. ASMELG, CFIAG
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