Dual-Root Partitioning Scheme; Srx210 Services Gateway Cooling System - Juniper SRX210 - HARDWARE GUIDE REV 3 Hardware Manual

Dual-Root Partitioning Scheme

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SRX210 Services Gateway Cooling System

Copyright © 2010, Juniper Networks, Inc.
Chapter 2: SRX210 Services Gateway Hardware Components and Specifications
The dual-root partitions allow the SRX210 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 SRX210 Services Gateway powers up, it tries to boot the Junos OS from the
default storage media. If the device fails to boot from the default storage media, it tries
to boot from the alternate storage media. With the dual-root partitioning scheme, the
SRX210 Services Gateway first tries to boot the Junos OS from the primary root partition
and then from the backup root partition on the default storage media. If both primary
and backup root partitions of a media fail to boot, then the device tries to boot from the
next available type of storage media. The SRX210 Services Gateway remains fully
functional even if it boots the Junos OS from the backup root partition of storage media.
NOTE: SRX210 Services Gateway that ship from the factory with Junos OS
Release 10.0 is formatted with the dual-root partitioning scheme.
Existing SRX210 Services Gateways that are running Junos OS Release 9.6 or earlier use
the single-root partitioning scheme.
While upgrading these devices to Junos OS Release 10.0, 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, see the Junos OS Administration
Guide.
SRX210 Services Gateway Specifications on page 7
SRX210 Services Gateway Front Panel and Back Panel Views (Low Memory, High
Memory, and PoE Versions) on page 10
SRX210 Services Gateway with Integrated Convergence Services Front Panel and Back
Panel Views on page 12
SRX210 Services Gateway Power Supply on page 25
The cooling system for the SRX210 Services Gateway with Low Memory, High Memory,
or Power over Ethernet (PoE) includes one fixed fan. The SRX210 Services Gateway with
Integrated Convergence Services has two fixed fans.
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