■
Upgrade and Downgrade Instructions for JUNOS Release 10.1 for SRX Series
Services Gateways and J Series Services Routers on page 185
■
Errata and Changes in Documentation for JUNOS Release 10.1 for SRX Series
Services Gateways and J Series Services Routers on page 165
Dual-Root Partitioning Scheme Documentation for SRX Series Services Gateways
Dual-Root Partitioning Scheme
JUNOS Release 10.1 supports dual-root partitions on SRX100, SRX210, SRX240, and
SRX650 devices. Dual-root partition allow the SRX Series devices to remain functional
if there is file system corruption and facilitate easy recovery of the corrupted file
system.
SRX Series devices running JUNOS Release 9.6 or earlier support a single-root
partitioning scheme where there is only one root partition. Because both the primary
and backup JUNOS Software images are located on the same root partition, the
system fails to boot if there is corruption in the root file system. The dual-root
partitioning scheme guards against this scenario by keeping 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.
SRX Series devices that ship with JUNOS Release 10.1 are formatted with dual-root
partitions from the factory. SRX Series devices that are running JUNOS Release 9.6
or earlier can be formatted with dual-root partitions when upgrading to JUNOS Release
10.1.
NOTE:
The dual-root partitioning scheme allows the SRX Series devices to remain
functional if there is file system corruption and facilitates easy recovery of the
corrupted file system. Although you can install JUNOS Release 10.1 on SRX100,
SRX210, SRX240, and SRX650 devices with the single-root partitioning scheme, we
strongly recommend the use of the dual-root partitioning scheme.
Selection of Boot Media and Boot Partition
When the SRX Series device powers on, 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.
SRX100, SRX210, SRX240 devices boot from the following storage media (in order
of priority):
1.
Internal NAND flash (default; always present)
2.
USB storage device (alternate)
Dual-Root Partitioning Scheme Documentation for SRX Series Services Gateways
■
175
Dual-Root Partitioning Scheme Documentation for SRX Series Services Gateways
