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
next available type of storage media. The SRX220 Services Gateway remains fully
functional even if it boots the Junos OS from the backup root partition of storage media.
Related
Documentation
• Installation Overview for the SRX220 Services Gateway on page 45
Copyright © 2016, Juniper Networks, Inc.10
SRX220 Services Gateway Hardware Guide for H Model Numbers
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