Using Snapshot

The Manage>Snapshot page allows you to configure storage devices to replace the primary boot device on your router or to act as a backup boot device. To do so, you create a snapshot of the system software running on your router, saving the snapshot to an alternate storage device.

The Manage Snapshot page allows you to perform the following tasks:

• Copy the current system software, along with the current and rescue configurations, to an alternate storage device.

  Caution: We recommend that you keep your secondary storage medium updated at all times. If the internal compact flash fails at startup, the J-series routing platform automatically boots itself from this secondary storage medium. The secondary storage medium can be either an external compact flash or a USB storage device. When a secondary storage medium is not available, the routing platform 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 routing platform are corrupted. The backup device must have a storage capacity of at least 256 MB.

• Copy 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.
• Configure a boot device to store snapshots of software failures, for use in troubleshooting.
• Partition the storage medium. This process is usually necessary for storage devices that do not already have software installed on them.
• Create a snapshot for use as the primary boot device to replace the device in the internal compact flash slot or to replicate it for use in another J-series routing platform. You can perform this action only on a removable storage device.
• Specify the size of the following partitions in kilobytes:
  • data—Data partition is not used by the routing platform, and can be used for extra storage.
  • swap—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.
  • config—Config partition is used for storing configuration files.
  • root—Root partition does not include configuration files.

Click Snapshot to begin.

Alternatively, you can use the request system snapshot command in the J-Web CLI terminal to take a snapshot of the routing platform. For information about installing boot devices, see the Getting Started Guide for your J-series router.

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