Juniper Networks J-Series - Manual (Page 212)

Table 98: CLI request system snapshot Command Options (continued)
Description Option
Partitions the medium. This option is usually necessary for boot devices that do not have software
already installed on them. partition
Specifies the size of the root partition, in megabytes. The default value is the boot device's physical
memory minus the config , data , and swap partitions.
The root partition is mounted on / and does not include configuration files.
This option also partitions the boot medium.
root-size size
Specifies the size of the swap partition, in megabytes. The default value is one-third of the physical
memory on a boot medium larger than 128 MB, or 0 MB on a smaller boot device.
The swap partition is used for swap files and software failure memory snapshots. Software failure
memory snapshots are saved to the boot medium only if it is specified as the dump device. For
information about the setting the dump device, see “Configuring a Boot Device to Receive
Software Failure Memory Snapshots” on page 190.
NOTE: This option also partitions the boot medium.
swap-size size
Configuring a Boot Device to Receive Software Failure Memory Snapshots
You can use the set system dump-device CLI command to specify the medium to use
for the Services Router to store system software failure memory snapshots. In this
way, when the operating system fails, if you have specified a system dump device
in the configuration, the operating system preserves a snapshot of the state of the
router when it failed.
After you reboot the system, the dump device is checked for a snapshot as part of
the operating system boot process. If a snapshot is found, it is written to the crash
dump directory on the router (
/var/crash ). The customer support team can examine
this memory snapshot to help determine the cause of the system software failure.
NOTE: If the swap partition on the dump device medium is not large enough for a
system memory snapshot, either a partial snapshot or no snapshot is written into
the crash dump directory.
Enter the set system dump-device CLI command with the following syntax:
user@host> set system dump-device boot-device | compact-flash |
removable-compact-flash | usb
Table 99 on page 191 describes the set system dump-device command options.
190 ■ Configuring Boot Devices
J-series™ Services Router Administration Guide