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Configuring a Boot Device for Backup with the J-Web Interface

You can use the J-Web interface to create a boot device on an alternate medium, to replace the primary boot device or serve as a backup.

Figure 77 shows the Snapshot page.

Figure 77: Snapshot Page

Snapshot Page

To create a boot device:

  1. In the J-Web interface, select Maintain>Snapshot.
  2. On the Snapshot page, enter information into the fields described in Table 241.
  3. Click Snapshot.
  4. Click OK.

Table 241: Snapshot Summary

Field

Function

Your Action

Target Media

Specifies the boot device to copy the snapshot to.

Note: You cannot copy software to the active boot device.

In the list, select a boot device that is not the active boot device:

  • compact-flash—Copies software to the internal compact flash.
  • removable-compact-flash—Copies software to the external compact flash. This option is available on J2320 and J2350 Services Routers only.
  • usb—Copies software to the device connected to the USB port.

Factory

Copies 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.

Note: After a boot device is created with the default factory configuration, it can operate only in an internal compact flash slot.

To copy only the default factory configuration, plus a rescue configuration if one exists, select the check box.

Partition

Partitions the medium. This process is usually necessary for boot devices that do not already have software installed on them.

To partition the medium that you are copying the snapshot to, select the check box.

As Primary Media

On an external compact flash or USB storage device only, creates a snapshot for use as the primary boot medium.

Use this feature to replace the medium in the internal compact flash slot or to replicate it for use in another device. This process also partitions the boot medium.

Note: After the boot device is created as an internal compact flash, it can operate only in an internal compact flash slot.

To create a boot medium to use in the internal compact flash only, select the check box.

Data Size

Specifies the size of the data partition, in kilobytes.

The data partition is mounted on /data. This space is not used by the device, and can be used for extra storage.

This selection also partitions the boot medium.

Type a numeric value, in kilobytes. The default value is 0 KB.

Swap Size

Specifies the size of the swap partition, in kilobytes.

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 the JUNOS Enhanced Services Administration Guide.

This selection also partitions the boot medium.

Type a numeric value, in kilobytes. The default value is one-third of the physical memory on a boot medium larger than 128,000 KB, or 0 KB on a smaller boot device.

Config Size

Specifies the size of the config partition, in kilobytes.

The config partition is mounted on /config. The configuration files are stored in this partition.

This selection also partitions the boot medium.

Type a numeric value, in kilobytes. The default value is 10 percent of physical memory on the boot medium.

Root Size

Specifies the size of the root partition, in kilobytes.

The root partition is mounted on / and does not include configuration files.

This selection also partitions the boot medium.

Type a numeric value, in kilobytes. The default value is the boot device's physical memory minus the config, data, and swap partitions.


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