Configuring A Boot Device To Receive Software Failure Memory Snapshots - Juniper J-Series Administration Manual

J-series Services Router Administration Guide
Table 98: CLI request system snapshot Command Options (continued)
Option
partition
root-size size
swap-size size

Configuring a Boot Device to Receive Software Failure Memory Snapshots

You can use the
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 (
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
user@host> set system dump-device boot-device | compact-flash |
removable-compact-flash | usb
Table 99 on page 191 describes the
190
Configuring Boot Devices
Description
Partitions the medium. This option is usually necessary for boot devices that do not have software
already installed on them.
Specifies the size of the partition, in megabytes. The default value is the boot device's physical
root
memory minus the ,
config data
The root partition is mounted on
This option also partitions the boot medium.
Specifies the size of the partition, in megabytes. The default value is one-third of the physical
swap
memory on a boot medium larger than 128 MB, or 0 MB on a smaller boot device.
The partition is used for swap files and software failure memory snapshots. Software failure
swap
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.
set system dump-device
set system dump-device
, and partitions.
swap
and does not include configuration files.
/
CLI command to specify the medium to use
). The customer support team can examine
/var/crash
CLI command with the following syntax:
set system dump-device
command options.