The root (/) and /config directories from the USB storage device are copied to the
active NAND flash slice.
Scenario: To take a snapshot from a USB storage device to the active slice of the NAND
flash device after partitioning:
1. Boot up the router from a USB storage device containing the required Junos OS image.
2. Issue the request system snapshot partition command.
user@host> request system snapshot partition
Verifying compatibility of destination media partitions...
Running newfs (439MB) on internal media / partition (da0s1a)...
Running newfs (46MB) on internal media /config partition (da0s1e)...
Copying '/dev/da1s1a' to '/dev/da0s1a' .. (this may take a few minutes)
Copying '/dev/da1s1e' to '/dev/da0s1e' .. (this may take a few minutes)
The following filesystems were archived: / /config
The BSD label (disk partitioning information) for the active flash slice is installed and
then the root (/) and /config directories from the USB storage device are copied to
the active NAND flash slice.
Related
Documentation
Understanding System Snapshot on an ACX Series Router on page 64•
• request system snapshot (ACX Series) on page 1807
Understanding In-Service Software Upgrade (ISSU) in ACX5000 Series Routers
An in-service software upgrade (ISSU) enables you to upgrade between two different
Junos OS releases with minimal disruption on the control plane and with minimal
disruption of traffic. During an ISSU, the Junos OS runs in two separate virtual machines
(VMs)—one VM is in the master role acting as the master Routing Engine, and the other
VM is in the backup role acting as the backup Routing Engine. The Junos OS is upgraded
on the backup VM. After a successful software upgrade, the backup VM then becomes
the master VM, and the original master VM is no longer needed and is shut down.
NOTE: ISSU is supported in Junos OS Release 15.1X54–D60 or later for
ACX5000 Series routers.
ISSU provides the following benefits:
•
Eliminates network downtime during software image upgrades
•
Reduces operating costs, while delivering higher service levels
•
Allows fast implementation of new features
•
In-Service Software Upgrade Process on page 69
Copyright © 2017, Juniper Networks, Inc.68
ACX Series Universal Access Router Configuration Guide
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