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SRX110 Services Gateway Boot Devices and Dual-Root Partitioning Scheme

 

This topic includes the following sections:

Boot Devices

The SRX110 Services Gateway can boot from two devices:

  • CompactFlash (default; always present)

  • USB storage key (alternate)

Dual-Root Partitioning Scheme

Dual-root partitions allow services gateways to remain functional if the file system becomes corrupted, and they 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 can boot from the backup Junos OS image in the other root partition and remain fully functional.

When the SRX110 Services Gateway powers up, it tries to boot Junos OS from the default storage medium. If the device fails to boot from the default storage medium, it tries to boot from the alternate storage medium. 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 medium. If both primary and backup root partitions of a storage medium fail to boot, then the device tries to boot from the next available type of storage media. The services gateway remains fully functional even if it boots Junos OS from the backup root partition of the storage medium.