Junipor交换机 HAS BOOTED FROM THE BACKUP JUNOS IMAGE

由于系统突然断电导致Junipor交换机打印一些报警信息：

--- JUNOS 11.4R1.6 built 2011-11-15 10:11:59 UTC

***********************************************************************

**                                                                   **

**  WARNING: THIS DEVICE HAS BOOTED FROM THE BACKUP JUNOS IMAGE      **

**                                                                   **

**  It is possible that the primary copy of JUNOS failed to boot up  **

**  properly, and so this device has booted from the backup copy.    **

**                                                                   **

**  Please re-install JUNOS to recover the primary copy in case      **

**  it has been corrupted.                                           **

**                                                                   **

***********************************************************************

这是由于加载了backup的slice，恢复方法如下：

root@:RE:0% cli
root> show system alarms
3 alarms currently active
Alarm time               Class  Description
2011-11-15 17:15:21 UTC  Minor  Host 0 Boot from backup root
2011-11-15 17:15:21 UTC  Major  Management Ethernet Link Down
2011-11-15 17:14:41 UTC  Minor  Rescue configuration is not set

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

Partitions information:
  Partition  Size   Mountpoint
  s1a        183M   altroot
  s2a        184M   /
  s3d        369M   /var/tmp
  s3e        123M   /var
  s4d        62M    /config

root> request system snapshot media internal slice alternate
Formatting alternate root (/dev/da0s1a)...
Copying '/dev/da0s2a' to '/dev/da0s1a' .. (this may take a few minutes)
The following filesystems were archived: /

root> request system reboot slice alternate me
                                              ˆ
'me' is ambiguous.
Possible completions:
  media                Boot media for next boot
  message              Message to display to all users
root> request system reboot slice alternate media internal
Reboot the system ? [yes,no] (no) yes

Shutdown NOW!
[pid 17511]