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Example: Installing Junos OS and Configuring a Dual-Root Partition on ACX Series Routers Using the CLI

Requirements

This example requires an ACX Series router. Before you begin, back up any important data.

Overview

This example formats the NAND Flash device and installs the new Junos OS image on the media with dual-root partitioning. Install the Junos OS Release 12.2 or later image from the CLI by using the request system software add command. Partitions are automatically created on ACX Series routers and no option needs to be manually entered for creating partitions. This command copies the image to the device, and then reboots the device for installation. The device boots with the Release 12.2 or later image installed with the dual-root partitioning scheme. The formatting and installation process is scheduled to run on the next reboot. Therefore, we recommend that this option be used together with the reboot option.

Note: The process might take 15 to 20 minutes. The system is not accessible over the network during this time.

Warning: Using the request system software add command erases the existing contents of the media. Only the current configuration is preserved. You should back up any important data before starting the process.

Note: Dual, internal NAND Flash device (first daOs1, then daOs2) and USB storage device are the storage media available on the ACX Series router. The USB storage device is not dual-root partitioned.

In this example, add the software package junos-juniper-12.2R1.9-domestic.tgz with the following options:

• no-copy option to install the software package. However, do not save the copies of the package files. You should include this option if you do not have enough space on the internal media to perform an upgrade that keeps a copy of the package on the device.
• no-validate option to bypass the compatibility check with the current configuration before installation starts.
• reboot option to reboot the device after installation is completed.

Configuration

CLI Quick Configuration

To install Junos OS Release 12.2 or later and configure dual-root partitioning on ACX Series routers, copy the following command, paste it in a text file, remove any line break, and then copy and paste the command into the CLI.

From operational mode, enter:

Step-by-Step Procedure

1. Upgrade the ACX Series router to Junos OS Release 12.2 or later using the CLI. See Upgrading Software Packages.
2. Install Junos OS Release 12.2 or later and configure the dual-root partition.
   user@host>request system software add junos-juniper-12.2R1.9-domestic.tgz no-copy no-validate rebootCopying package junos-juniper-12.2R1.9-domestic.tgz to var/tmp/install Rebooting ...

Results

In operational mode, confirm your configuration by entering the show system storage command. If the output does not display the intended configuration, repeat the configuration instructions in this example to correct it.

Sample output on a system with dual-root partitioning that displays information about the root partition that is mounted (only one root partition is mounted at a point in time):

Filesystem              Size       Used      Avail  Capacity   Mounted on
/dev/da0s1a             872M       150M       713M       17%  /
devfs                   1.0K       1.0K         0B      100%  /dev
/dev/md0                 41M        41M         0B      100%  /packages/mnt/jbase
/dev/md1                183M       183M         0B      100%  /packages/mnt/jkernel-ppc-12.2I20121026_1217_sranjan
/dev/md2                 30M        30M         0B      100%  /packages/mnt/jpfe-ACX-12.2I20121026_1217_sranjan
/dev/md3                9.1M       9.1M         0B      100%  /packages/mnt/jdocs-12.2I20121026_1217_sranjan
/dev/md4                 55M        55M         0B      100%  /packages/mnt/jroute-ppc-12.2I20121026_1217_sranjan
/dev/md5                 12M        12M         0B      100%  /packages/mnt/jcrypto-ppc-12.2I20121026_1217_sranjan
/dev/md6                1.0G       8.0K       951M        0%  /tmp
/dev/md7                1.0G       448K       950M        0%  /mfs
/dev/da0s1e              92M        18K        91M        0%  /config
procfs                  4.0K       4.0K         0B      100%  /proc
/dev/da0s3f             3.9G       3.6G        30M       99%  /var
/dev/da0s3d             447M       2.8M       409M        1%  /var/log

If you are done configuring the device, enter commit in configuration mode.

You can issue the fdisk command from the Junos prompt to display information about the entire partition format on the NAND Flash device. All ACX Series routers run with dual-root partitioning. The following example displays the partition details on an ACX Series router with dual-root partitions:

******* Working on device /dev/da0 *******
parameters extracted from in-core disklabel are:
cylinders=487 heads=255 sectors/track=63 (16065 blks/cyl)

parameters to be used for BIOS calculations are:
cylinders=487 heads=255 sectors/track=63 (16065 blks/cyl)

Media sector size is 512
Warning: BIOS sector numbering starts with sector 1
Information from DOS bootblock is:
The data for partition 1 is:
sysid 165 (0xa5),(FreeBSD/NetBSD/386BSD)
    start 567, size 1011528 (493 Meg), flag 80 (active)
        beg: cyl 0/ head 9/ sector 1;
        end: cyl 62/ head 254/ sector 63
The data for partition 2 is:
sysid 165 (0xa5),(FreeBSD/NetBSD/386BSD)
    start 1012662, size 1011528 (493 Meg), flag 0
        beg: cyl 63/ head 9/ sector 1;
        end: cyl 125/ head 254/ sector 63
The data for partition 3 is:
sysid 165 (0xa5),(FreeBSD/NetBSD/386BSD)
    start 2024757, size 3581928 (1748 Meg), flag 0
        beg: cyl 126/ head 9/ sector 1;
        end: cyl 348/ head 254/ sector 63
The data for partition 4 is:
sysid 165 (0xa5),(FreeBSD/NetBSD/386BSD)
    start 5607252, size 2200338 (1074 Meg), flag 0
        beg: cyl 349/ head 9/ sector 1;
        end: cyl 485/ head 254/ sector 63

In the preceding example, partition 1 and 2 contain two partitions each internally, a root partition and a configuration partition.

Verification

Confirm that the configuration is working properly.

• Verifying the Partitioning Scheme Details

Verifying the Partitioning Scheme Details

Purpose

Verify that the partitioning scheme details on the ACX Series router were configured.

Action

In operational mode, enter the show system storage command. For details about the output of this command and the descriptions of the output fields, see show system storage.