Dell PowerConnect J-SRX240, Hardware Manual, Page: 35 / 160

J-SRX240 Services Gateway Boot Devices and Dual-Root Partitioning Scheme
This topic includes the following sections:
• Boot Devices on page 19
•
Dual-Root Partitioning Scheme on page 19
Boot Devices
The J-SRX240 Services Gateway can boot from the following storage media (in the order
of priority):
•
Internal NAND flash (default; always present)
• USB storage key (alternate)
Dual-Root Partitioning Scheme
Dual-root partitions allow the J-SRX240 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 J-SRX240 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 J-SRX240 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 J-SRX240 Services Gateway
remains fully functional even if it boots the JUNOS Software from the backup root partition
of storage media.
Related Topics J-SRX240 Services Gateway Specifications on page 7
•
•
J-SRX240 Services Gateway Front Panel and Back Panel Views on page 9
•
J-SRX240 Services Gateway Built-In Interfaces on page 13
•
J-SRX240 Services Gateway LEDs on page 14
•
J-SRX240 Services Gateway Power Supply on page 20
•
J-SRX240 Services Gateway Cooling System on page 20
19
Chapter 2: J-SRX240 Services Gateway Hardware Components and Specifications