Network Router User Manual

■ SRX210 Services Gateway Cooling System on page 24
■ SRX210 Services Gateway Power Supply on page 26
SRX210 Services Gateway Boot Devices and Dual-Root Partitioning Scheme
This topic includes the following sections:
■ Boot Devices on page 23
■ Dual-Root Partitioning Scheme on page 23
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 Software
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 Software
image located in the other root partition and remain fully functional.
When the SRX210 Services Gateway powers up, it tries to boot the JUNOS Software
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 Software 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 Software
from the backup root partition of storage media.
NOTE: SRX210 Services Gateway that ship from the factory with JUNOS Software
Release 10.0 is formatted with the dual-root partitioning scheme.
Existing SRX210 Services Gateways that are running JUNOS Software Release 9.6 or
earlier use the single-root partitioning scheme.
While upgrading these devices to JUNOS Software Release 10.0, you can choose to
format the storage media with dual-root partitions (strongly recommended) or retain
the existing single-root partitioning.
SRX210 Services Gateway Boot Devices and Dual-Root Partitioning Scheme ■ 23
Chapter 2: SRX210 Services Gateway Hardware Components and Specifications