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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.

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 94 describes the set system dump-device command options.

Table 94: CLI set system dump-device Command Options

Option	Description
boot-device	Uses whatever device was booted from as the system software failure memory snapshot device.
compact-flash	Uses the primary compact flash as the system software failure memory snapshot device.
removable-compact-flash	Uses the compact flash device on the front of the router (J4300 and J6300 only) as the system software failure memory snapshot device.
usb	Uses the device attached to the USB port as the system software failure memory snapshot device.

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