Important Features of the Dual-Root Partitioning Scheme
The dual-root partitioning scheme has the following important features:
•
The primary and backup copies of Junos OS images reside in separate partitions. The
partition containing the backup copy is mounted only when required. With the
single-root partitioning scheme, there is one root partition that contains both the
primary and the backup Junos OS images.
•
The request system software add command for a Junos OS package erases the contents
of the other root partition. The contents of the other root partition will not be valid
unless software installation is completed successfully.
•
Add-on packages, such as jais or jfirmware, can be reinstalled as required after a new
Junos OS image is installed.
•
The request system software rollback command does not delete the current Junos OS
image. It is possible to switch back to the image by issuing the rollback command again.
Related
Documentation
Understanding How the Primary Junos OS Image with Dual-Root Partitioning Recovers
on the ACX Series Router on page 49
•
• Installing Junos OS Using a USB Storage Device on ACX Series Routers on page 52
• Installing Junos OS Upgrades from a Remote Server on ACX Series Routers on page 52
• Example: Installing Junos OS and Configuring a Dual-Root Partition on ACX Series
Routers Using the CLI on page 53
Understanding How the Primary Junos OS Image with Dual-Root Partitioning Recovers
on the ACX Series Router
If the ACX Series Universal Access router is unable to boot from the primary Junos OS
image and boots up from the backup Junos OS image in the backup root partition, a
message appears on the console at the time of login indicating that the device has booted
from the backup Junos OS image.
NOTE: ACX5048 and ACX5096 routers do not support dual-root partitioning.
login: user
Password:
***********************************************************************
** **
** WARNING: THIS DEVICE HAS BOOTED FROM THE BACKUP JUNOS IMAGE **
49Copyright © 2017, Juniper Networks, Inc.
Chapter 2: Installing and Upgrading Junos OS
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