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SRX240 Services Gateway Boot Devices and Dual-Root Partitioning Scheme

 

This topic includes the following sections:

Boot Devices

The SRX240 Services Gateway can boot from the following storage media (in the given order of priority):

  • Internal NAND flash memory (default; always present)

  • USB storage device (alternate)

Dual-Root Partitioning Scheme

Dual-root partitions allow 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 OS 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 OS image located in the other root partition and remain fully functional.

When the services gateway powers up, it tries to boot Junos OS from the default storage media. If the services gateway fails to boot from the default storage media, it tries to boot from the alternate storage media. With the dual-root partitioning scheme, the services gateway first tries to boot Junos OS from the primary root partition and then from the backup root partition on the default storage media. The services gateway remains fully functional even if it boots Junos OS from the backup root partition of storage media.

Note

SRX Series Services Gateways that ship with Junos OS Release 10.0 or later are formatted for the dual-root partitioning scheme.

SRX240 Services Gateways that are running Junos OS Release 9.6 or earlier use the single-root partitioning scheme. While upgrading these services gateway to Junos OS Release 10.0 or later, you can choose to format the storage media with dual-root partitions (strongly recommended) or retain the existing single-root partitioning.

For instructions on upgrading to Junos OS Release 10.0 or later, see the following guides: