1.查看启动分区，如下所示，可以看出active的分区为da0s1a，也是当前的启动分区。

root> show system storage partitions
Boot Media: internal (da0)
Active Partition: da0s1a
Backup Partition: da0s2a
Currently booted from: active (da0s1a)

Partitions information:
Partition Size Mountpoint
s1a 292M /
s2a 293M altroot
s3e 24M /config
s3f 342M /var
s4a 27M recovery
s4e 2.7M

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