[geeks] Solaris root backups

[Phil Stracchino]

Hey folks,
I noticed today I've accumulated quite a number of backup Solaris root
ZFS filesystems, presumably during system upgrades:

asgard:root:/:105 # zfs list
NAME                                               USED  AVAIL  REFER
MOUNTPOINT
arcpool                                           4.30M  2.67T  44.9K
/arcpool
rpool                                              146G  82.0G  4.54M
/rpool
rpool/ROOT                                        26.2G  82.0G    31K
legacy
rpool/ROOT/solaris                                25.8G  82.0G  8.73G  /
rpool/ROOT/solaris-backup-1                       47.5M  82.0G  3.29G  /
rpool/ROOT/solaris-backup-1/var                     61K  82.0G   195M  /var
rpool/ROOT/solaris-backup-10                      53.3M  82.0G  7.60G  /
rpool/ROOT/solaris-backup-10/var                    60K  82.0G  11.3G  /var
rpool/ROOT/solaris-backup-11                      53.2M  82.0G  8.62G  /
rpool/ROOT/solaris-backup-11/var                    77K  82.0G  11.3G  /var
rpool/ROOT/solaris-backup-2                       47.5M  82.0G  3.32G  /
rpool/ROOT/solaris-backup-2/var                    114K  82.0G   914M  /var
rpool/ROOT/solaris-backup-3                        340K  82.0G  7.98G  /
rpool/ROOT/solaris-backup-3/var                     61K  82.0G   315M  /var
rpool/ROOT/solaris-backup-4                        342K  82.0G  7.98G  /
rpool/ROOT/solaris-backup-4/var                     63K  82.0G   315M  /var
rpool/ROOT/solaris-backup-5                       53.2M  82.0G  7.42G  /
rpool/ROOT/solaris-backup-5/var                     57K  82.0G  2.16G  /var
rpool/ROOT/solaris-backup-6                       53.2M  82.0G  7.45G  /
rpool/ROOT/solaris-backup-6/var                     73K  82.0G  11.2G  /var
rpool/ROOT/solaris-backup-7                       53.2M  82.0G  7.45G  /
rpool/ROOT/solaris-backup-7/var                     73K  82.0G  11.2G  /var
rpool/ROOT/solaris-backup-8                       53.2M  82.0G  7.45G  /
rpool/ROOT/solaris-backup-8/var                     73K  82.0G  11.2G  /var
rpool/ROOT/solaris-backup-9                       53.2M  82.0G  7.45G  /
rpool/ROOT/solaris-backup-9/var                     85K  82.0G  11.2G  /var
rpool/ROOT/solaris/var                            14.2G  82.0G  2.51G  /var
rpool/VARSHARE                                     686M  82.0G   686M
/var/share
rpool/VARSHARE/pkg                                  66K  82.0G    35K
/var/share/pkg
rpool/VARSHARE/pkg/repositories                     31K  82.0G    31K
/var/share/pkg/repositories
rpool/VARSHARE/zones                                34K  82.0G    34K
/system/zones
...
...
rpool/nameserver/rpool/ROOT/solaris               2.99G  82.0G  2.61G
/rpool/nameserver/root
rpool/nameserver/rpool/ROOT/solaris-1               40K  82.0G  2.60G  /
rpool/nameserver/rpool/ROOT/solaris-1/var            1K  82.0G   128M  /var
rpool/nameserver/rpool/ROOT/solaris-2               40K  82.0G  2.60G  /
rpool/nameserver/rpool/ROOT/solaris-2/var            1K  82.0G   128M  /var
rpool/nameserver/rpool/ROOT/solaris-3               40K  82.0G  2.60G  /
rpool/nameserver/rpool/ROOT/solaris-3/var            1K  82.0G   128M  /var
rpool/nameserver/rpool/ROOT/solaris-4               40K  82.0G  2.60G  /
rpool/nameserver/rpool/ROOT/solaris-4/var            1K  82.0G   128M  /var
rpool/nameserver/rpool/ROOT/solaris-5               40K  82.0G  2.60G  /
rpool/nameserver/rpool/ROOT/solaris-5/var            1K  82.0G   128M  /var
rpool/nameserver/rpool/ROOT/solaris-6               40K  82.0G  2.60G  /
rpool/nameserver/rpool/ROOT/solaris-6/var            1K  82.0G   136M  /var
rpool/nameserver/rpool/ROOT/solaris-7               41K  82.0G  2.61G  /
rpool/nameserver/rpool/ROOT/solaris-7/var            1K  82.0G   118M  /var
rpool/nameserver/rpool/ROOT/solaris/var            248M  82.0G   119M
/rpool/nameserver/root/var


All but the last two sets were created in 2017.  At some point I should
clean these up, but when I started thinking about doing so, I realized
that I'm not sure how to determine which ones I can safely destroy.
I've been unable to quickly find any document that discusses managing
them (but perhaps I just haven't found the right search terms).

Is the answer "ALL of the numbered rpool/ROOT/solaris-backup-* and
rpool/nameserver/rpool/ROOT/solaris-* filesystems"?



-- 
  Phil Stracchino
  Babylon Communications
  phils at caerllewys.net
  phil at co.ordinate.org
  Landline: +1.603.293.8485
  Mobile:   +1.603.998.6958