Juniper Networks J-Series - Manual (Page 211)

Configuring a Boot Device for Backup with the CLI
Use the request system snapshot CLI command to create a boot device for the Services
Router on an alternate medium, to replace the primary boot device or serve as a
backup. Enter the command with the following syntax:
user@host> request system snapshot <as-primary> <config-size size> <data-size
size> <factory> <media type> <partition> <root-size size> <swap-size size>
Table 98 on page 189 describes the request system snapshot command options.
Default values are in megabytes, but you can alternatively enter values in kilobytes
by appending
k to the number. For example, config-size 10 specifies a config partition
of 10 MB, but config-size 10k specifies a config partition of 10 KB.
Table 98: CLI request system snapshot Command Options
Description Option
On an external compact flash or USB storage device only, creates a snapshot for use as the
primary boot medium.
Use the as-primary option to replace the medium in the internal compact flash slot or to replicate
it for use in another Services Router. This process also partitions the boot medium.
NOTE: After the boot device is created as an internal compact flash, it can operate only in an
internal compact flash slot.
as-primary
Specifies the size of the config partition, in megabytes. The default value is 10 percent of physical
memory on the boot medium.
The config partition is mounted on /config . The configuration files are stored in this partition.
This option also partitions the boot medium.
config-size size
Specifies the size of the data partition, in megabytes. The default value is 0 MB.
The data partition is mounted on /data . This space is not used by the router, and can be used
for extra storage.
This option also partitions the boot medium.
data-size size
Copies only default files that were loaded on the internal compact flash when it was shipped
from the factory, plus the rescue configuration if one has been set.
NOTE: After the boot medium is created with the factory option, it can operate in only the internal
compact flash slot.
factory
Specifies the boot device the software snapshot is copied to:
■ compact-flash —Copies software to the internal compact flash.
■ removable-compact-flash —Copies software to the external compact flash. This option is
available on J2320, J2350, J4300, and J6300 Services Routers only.
■ usb —Copies software to the device connected to the USB port.
NOTE: You cannot copy software to the active boot device.
media type
Configuring Boot Devices ■ 189
Chapter 10: Performing Software Upgrades and Reboots