SRX220 Services Gateway Boot Devices and Dual-Root Partitioning Scheme

This topic includes the following sections:

Boot Devices

The SRX220 Services Gateway can boot from two devices:

Dual-Root Partitioning Scheme

The services gateway has a dual-root partitioning scheme that allows it to remain functional if there is file system corruption, and that facilitates 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 located in the other root partition and remain fully functional.

When the SRX220 Services Gateway powers up, it tries to boot the Junos OS 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 SRX220 Services Gateway first tries to boot the Junos OS 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 SRX220 Services Gateway remains fully functional even if it boots the Junos OS from the backup root partition of storage media.

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