Software Upgrade Methods on the SRX Series Services Gateways

SRX Series devices that ship from the factory with Junos OS Release 10.0 or later are formatted with the dual-root partitioning scheme.

Existing SRX Series devices that are running Junos OS Release 9.6 or earlier use the single-root partitioning scheme. While upgrading these devices 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.

Certain Junos OS upgrade methods format the internal media before installation, whereas other methods do not. To install Junos OS Release 10.0 or later with the dual-root partitioning scheme, you must use an upgrade method that formats the internal media before installation.

The following upgrade methods format the internal media before installation:

• Installation from the boot loader using a TFTP server
• Installation from the boot loader using a USB storage device
• Installation from the CLI using the partition option (available in Junos OS Release 10.0)
• Installation using J-Web

The following upgrade methods retain the existing partitioning scheme:

• Installation using the CLI
• Installation using J-Web

Warning: Upgrade methods that format the internal media before installation wipe out the existing contents of the media. Only the current configuration will be preserved. Any important data should be backed up before starting the process.

Note: Once the media has been formatted with the dual-root partitioning scheme, you can use conventional CLI or J-Web installation methods, which retain the existing partitioning and contents of the media, for subsequent upgrades.