ZFS on root with dedupe

Hi,

I installed FreeBSD 13.1 server with ZFS raid 10 to serve a PostgreSQL 
database, LDAP and DNS. I never noticed until today, I installed some 
more memory and was checking status after the starting up. DEDUP appears 
enabled, is that by default? I certainly did not enable. Does this mean 
it is in fact enabled and what are the repercussions of disabling now?

> root@db1:~ # zpool list
> NAME   SIZE  ALLOC   FREE  CKPOINT  EXPANDSZ   FRAG    CAP  DEDUP    HEALTH  ALTROOT
> zdb1   262G  26.1G   236G        -         -     7%     9%  1.00x    ONLINE  -
> root@db1:~ # zpool status
>   pool: zdb1
>  state: ONLINE
>   scan: scrub repaired 0B in 00:04:52 with 0 errors on Thu Apr 13 10:46:22 2023
> config:
> 
>         NAME        STATE     READ WRITE CKSUM
>         zdb1        ONLINE       0     0     0
>           mirror-0  ONLINE       0     0     0
>             ada0p3  ONLINE       0     0     0
>             ada1p3  ONLINE       0     0     0
>           mirror-1  ONLINE       0     0     0
>             ada2p3  ONLINE       0     0     0
>             ada3p3  ONLINE       0     0     0
> root@db1:~ # zfs list
> NAME                USED  AVAIL     REFER  MOUNTPOINT
> zdb1               26.0G   228G       96K  /zdb1
> zdb1/ROOT          24.8G   228G       96K  none
> zdb1/ROOT/default  24.8G   228G     14.6G  /
> zdb1/tmp           1.12M   228G      200K  /tmp
> zdb1/usr           1.17G   228G       96K  /usr
> zdb1/usr/home      1.31M   228G     1.30M  /usr/home
> zdb1/usr/ports     1.17G   228G     1.17G  /usr/ports
> zdb1/usr/src         96K   228G       96K  /usr/src
> zdb1/var           5.35M   228G       96K  /var
> zdb1/var/audit       96K   228G       96K  /var/audit
> zdb1/var/crash       96K   228G       96K  /var/crash
> zdb1/var/log       4.78M   228G      660K  /var/log
> zdb1/var/mail       200K   228G      144K  /var/mail
> zdb1/var/tmp

-- 
Robert