ZFS Creating ZFS datasets for snapshots?

E

et.fz

Hi,

Never really understood ZFS datasets. I currently have this:

Code: 
# zfs list
NAME                 USED  AVAIL  REFER  MOUNTPOINT
zroot               8.46G  27.9G    88K  /zroot
zroot/ROOT          7.07G  27.9G    88K  none
zroot/ROOT/default  7.07G  27.9G  7.07G  /
zroot/backup          88K  27.9G    88K  /zroot/backup
zroot/tmp            128K  27.9G   128K  /tmp
zroot/usr           1.28G  27.9G    88K  /usr
zroot/usr/home      1.28G  27.9G  1.10G  /usr/home
zroot/usr/ports       88K  27.9G    88K  /usr/ports
zroot/usr/src         88K  27.9G    88K  /usr/src
zroot/var           94.0M  27.9G    88K  /var
zroot/var/audit       88K  27.9G    88K  /var/audit
zroot/var/crash       88K  27.9G    88K  /var/crash
zroot/var/log       93.4M  27.9G  93.4M  /var/log
zroot/var/mail       236K  27.9G   236K  /var/mail
zroot/var/tmp         88K  27.9G    88K  /var/tmp

I have been taking daily snapshots of zroot/ROOT/default, but I would like to narrow this down to /etc and /usr/local/etc. I understand I can't do that, as those aren't datasets.

My question is simply; can I just zfs create zroot/etc, and start snapshooting, or do I need to know or do anything?
 
It's that simple.

Just be caseful while /etc is moved away for the copying. Better boot from a memory stick while you are doing that.

And make sure the BE knows to also cover those new datasets.
 
Hm, what's going to happen, exactly? It's only a few MB, so it should be quick, but...

How do I verify BE coverage?
 
How is init(8) going to find /etc/rc if /etc isn't mounted yet? At boot only zroot/ROOT/default will be available.
 
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