How to Roll Back Root Pool Snapshots From a Failsafe Boot

This procedure assumes that existing root pool snapshots are available. In this example, the root pool snapshots are available on the local system. For example:

# zpool set listsnapshots=on rpool
# zfs snapshot -r rpool/ROOT@0311
# zfs list
NAME                         USED  AVAIL  REFER  MOUNTPOINT
rpool                        5.67G  1.04G  21.5K  /rpool
rpool/ROOT                   4.66G  1.04G    18K  /rpool/ROOT
rpool/ROOT@1013                  0      -    18K  -
rpool/ROOT/zfsnv109BE        4.66G  1.04G  4.66G  /
rpool/ROOT/zfsnv109BE@0311       0      -  4.66G  -
rpool/dump                    515M  1.04G   515M  -
rpool/swap                    513M  1.54G    16K  -

1. Shutdown the system and boot failsafe mode.

   ok boot -F failsafe Multiple OS instances were found. To check and mount one of them read-write under /a, select it from the following list. To not mount any, select 'q'. 1 /dev/dsk/c1t1d0s0 Solaris Express Community Edition snv_109 SPARC 2 rpool:7641827061132033134 ROOT/zfsnv1092BE Please select a device to be mounted (q for none) [?,??,q]: 2 mounting rpool on /a

2. Rollback the individual root pool snapshots.

   # zfs rollback -rf rpool/ROOT@0311

3. Reboot back to multiuser mode.

   # init 6