Juniper Networks SRX 210 - Manual (Page 33)

NOTE: The PoE LED is enabled only on the Power over Ethernet (PoE) model
of the SRX210 Services Gateway. For non-PoE models, the PoE LED remains
off.
Related
Documentation
SRX210 Services Gateway Front Panel and Back Panel Views (Low Memory, High
Memory, and PoE Versions) on page 9 •
• SRX210 Services Gateway Built-In Interfaces on page 11
• SRX210 Services Gateway Boot Devices and Dual-Root Partitioning Scheme on page 17
• SRX210 Services Gateway Cooling System on page 18
• SRX210 Services Gateway Power Supply on page 19
SRX210 Services Gateway Boot Devices and Dual-Root Partitioning Scheme
This topic includes the following sections:
• Boot Devices on page 17
• Dual-Root Partitioning Scheme on page 17
Boot Devices
The SRX210 Services Gateway can boot from two devices:
• Internal NAND Flash (default; always present)
• USB storage key (alternate)
Dual-Root Partitioning Scheme
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.
17 Copyright © 2013, Juniper Networks, Inc.
Chapter 2: SRX210 Services Gateway Hardware Components and Specifications