Juniper ACX1000 Configuration Manual page 108

ACX Series Universal Access Router Configuration Guide
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** It is possible that the active copy of JUNOS failed to boot up
** properly, and so this device has booted from the backup copy.
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** Please re-install JUNOS to recover the active copy in case
** it has been corrupted.
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Because the system is left with only one functional root partition, you should immediately
restore the primary Junos OS image using one of the following methods:
Install a new image using the CLI. When you install the new image, the new image is
installed on only one partition–the alternate partition, meaning the router is now running
two images. When you reboot, the router boots from the newly installed image, which
becomes the primary image. So now there are two different images running on the
router. Run the installation process again to update the other partition.
Use a snapshot of the backup root partition by entering the
command. After the primary root partition is recovered using this method,
slice alternate
the device will successfully boot from the primary root partition on the next reboot.
After the procedure, the primary root partition will contain the same version of Junos
OS as the backup root partition.
NOTE: You can use the CLI command
to back up the currently running root file system (primary or
alternate
secondary) to the other root partition on the system.
You can use this command to:
Save an image of the primary root partition in the backup root partition
when the system boots from the primary root partition.
Save an image of the backup root partition in the primary root partition
when the system boots from the backup root partition.
WARNING: The process of restoring the alternate root by using the CLI
command
request system snapshot slice alternate
to complete. If you terminate the operation before completion, the alternate
root might not have all required contents to function properly.
request system snapshot
request system snapshot slice
takes several minutes
Copyright © 2017, Juniper Networks, Inc.
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