NOTE: We strongly recommend using only transceivers provided by Juniper
Networks on an SRX220 Services Gateway. We cannot guarantee that the
interface module will operate correctly if third-party transceivers are used.
Contact Juniper Networks for the correct transceiver part number for your
device.
Related
Documentation
SRX220 Services Gateway Specifications on page 7•
• SRX220 Services Gateway Front Panel and Back Panel Views on page 9
• SRX220 Services Gateway LEDs on page 11
• SRX220 Services Gateway Boot Devices and Dual-Root Partitioning Scheme on page 16
• SRX220 Services Gateway Cooling System on page 17
• SRX220 Services Gateway Power Supply on page 17
SRX220 Services Gateway Boot Devices and Dual-Root Partitioning Scheme
This topic includes the following sections:
•
Boot Devices on page 16
•
Dual-Root Partitioning Scheme on page 16
Boot Devices
The SRX220 Services Gateway can boot from two devices:
•
CompactFlash card (default; always present)
•
USB storage key (alternate)
Dual-Root Partitioning Scheme
The services gateway has a dual-root partitioning scheme that allows it to remain
functional if there is file system corruption, and that facilitates 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 can boot from the backup Junos OS image located in the other
root partition and remain fully functional.
When the SRX220 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
SRX220 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
Copyright © 2012, Juniper Networks, Inc.16
SRX220 Services Gateway Hardware
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