Dual-Root Partitioning Scheme - Juniper SRX240 Hardware Manual

Dual-Root Partitioning Scheme

Related
Documentation
Copyright © 2013, Juniper Networks, Inc.
Chapter 2: SRX240 Services Gateway Hardware Components and Specifications
USB storage device (alternate)
Dual-root partitions allow SRX240 Services Gateways to remain functional if there is file
system corruption and facilitate easy recovery of the corrupted file system.
The dual-root partitioning scheme keeps the primary and backup Junos OS images in
two independently bootable root partitions. If the primary root partition becomes
corrupted, the system will be able to boot from the backup Junos OS image located in
the other root partition and remain fully functional.
When the services gateway powers up, it tries to boot Junos OS from the default storage
media. If the services gateway fails to boot from the default storage media, it tries to
boot from the alternate storage media. With the dual-root partitioning scheme, the
services gateway first tries to boot Junos OS from the primary root partition and then
from the backup root partition on the default storage media. The services gateway
remains fully functional even if it boots Junos OS from the backup root partition of storage
media.
NOTE: SRX Series Services Gateways that ship with Junos OS Release 10.0
or later are formatted for the dual-root partitioning scheme.
SRX240 Services Gateways that are running Junos OS Release 9.6 or earlier use the
single-root partitioning scheme. While upgrading these services gateway to Junos OS
Release 10.0 or later, you can choose to format the storage media with dual-root partitions
(strongly recommended) or retain the existing single-root partitioning.
For instructions on upgrading to Junos OS Release 10.0 or later, see the following guides:
Initial Configuration for Security Devices
Monitoring and Troubleshooting for Security Devices
SRX240 Services Gateway Chassis on page 7
SRX240 Services Gateway Front Panel and Back Panel Views on page 9
SRX240 Services Gateway Built-In Interfaces on page 12
SRX240 Services Gateway LEDs on page 14
SRX240 Services Gateway Power Supply on page 20
SRX240 Services Gateway Cooling System on page 21
19