在EX或是SRX都遇到過一個問題，在開機後出現下列訊息:
** 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 and if auto-snapshot feature is not **
** enabled. **
有可能是沒有用request system重開機或關機後造成的問題，解決方法如下:
1.將backup partition的software copy到primary partition:
request system snapshot media internal slice alternate。
2.以上指令只是修復partition，並不會消除系統的alarm:
show system alarms後會有Minor Host 0 Boot from backup root的訊息。
3.從primary partition開機並消除alarm訊息:
request system reboot slice alternate media internal
系統會重新啟動，並從primary partition開機。