| I have recently started trying out FreeBSD and I have a ZFS question.
In the third edition of Absolute FreeBSD, as well as the FreeBSD Handbook, a "zfs list" command shows something like this (I have copied this from the FreeBSD Handbook, which mirrors Michael's book):
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# zfs list
NAME USED AVAIL REFER MOUNTPOINT
mypool 781M 93.2G 144K none
mypool/ROOT 777M 93.2G 144K none
mypool/ROOT/default 777M 93.2G 777M /
mypool/tmp 176K 93.2G 176K /tmp
mypool/usr 616K 93.2G 144K /usr
mypool/usr/home 184K 93.2G 184K /usr/home
mypool/usr/ports 144K 93.2G 144K /usr/ports
mypool/usr/src 144K 93.2G 144K /usr/src
mypool/var 1.20M 93.2G 608K /var
mypool/var/crash 148K 93.2G 148K /var/crash
mypool/var/log 178K 93.2G 178K /var/log
mypool/var/mail 144K 93.2G 144K /var/mail
mypool/var/tmp 152K 93.2G 152K /var/tmp
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As you can see the root dataset is unmounted and set to having a mountpoint of "none". But when I installed FreeBSD 12.0, the root dataset is now mounted by default:
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% zfs list
NAME USED AVAIL REFER MOUNTPOINT
zroot 459M 17.5G 88K /zroot
zroot/ROOT 458M 17.5G 88K none
zroot/ROOT/default 457M 17.5G 457M /
zroot/tmp 88K 17.5G 88K /tmp
zroot/usr 388K 17.5G 88K /usr
zroot/usr/home 124K 17.5G 124K /usr/home
zroot/usr/ports 88K 17.5G 88K /usr/ports
zroot/usr/src 88K 17.5G 88K /usr/src
zroot/var 572K 17.5G 88K /var
zroot/var/audit 88K 17.5G 88K /var/audit
zroot/var/crash 88K 17.5G 88K /var/crash
zroot/var/log 132K 17.5G 132K /var/log
zroot/var/mail 88K 17.5G 88K /var/mail
zroot/var/tmp 88K 17.5G 88K /var/tmp
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Based on what I have read about ZFS so far, I can't see a benefit to this change, but I am a newbie so I am probably missing something. Can you can tell me why the root dataset is now mounted by default on new installs?
Thanks
Owen
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