Recovering Primary Boot Devices; Why Compact Flash Recovery Might Be Necessary; Recommended Recovery Hardware And Software; Configuring Internal Compact Flash Recovery - Juniper J-Series Administration Manual

Table 99: CLI set system dump-device Command Options
Option
boot-device
compact-flash
removable-compact-flash
usb

Recovering Primary Boot Devices

All Services Routers use a compact flash to store the JUNOS software, router
configuration files, and log files. The internal compact flash is not hot-swappable and
is accessible only after you remove the cover on the back panel of the router chassis.
In addition to the internal compact flash, J4300 and J6300 Services Routers have a
slot in the front of the chassis for external flash media. All Services Routers also
support externally pluggable USB storage devices. If the primary storage medium
becomes corrupted and no secondary medium is in place, you can reload the JUNOS
recovery software package onto the corrupted compact flash card with a desktop or
laptop computer running either a UNIX, Microsoft Windows 2000, or Windows XP
operating system.
This section contains the following topics:

Why Compact Flash Recovery Might Be Necessary

For media redundancy, we recommend that you keep a secondary storage medium
attached and updated at all times. Use the
perform the update. (For instructions, see "Configuring Boot Devices" on page 186.)
If the internal compact flash fails at startup, the Services Router automatically boots
itself from the external compact flash or USB storage device. When a redundant
storage medium is not available, the router is unable to boot and does not come
back online. This situation can occur if the power fails during a JUNOS software
upgrade and the physical or logical storage media on the router are corrupted.
If the primary storage medium becomes corrupted and no secondary medium is in
place, you can reload the JUNOS software image onto the corrupted compact flash
with a desktop or laptop computer running either a UNIX, Microsoft Windows 2000,
or Windows XP operating system.
Description
Uses whatever device was booted from as the system software failure memory snapshot
device.
Uses the internal compact flash as the system software failure memory snapshot device.
Uses the compact flash on the front of the router (J4300 and J6300 only) as the system
software failure memory snapshot device.
Uses the device attached to the USB port as the system software failure memory
snapshot device.
Why Compact Flash Recovery Might Be Necessary on page 191
Recommended Recovery Hardware and Software on page 192
Configuring Internal Compact Flash Recovery on page 192
Chapter 10: Performing Software Upgrades and Reboots
request system snapshot

Recovering Primary Boot Devices

command to
191