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[ACX] How to mount a USB drive on ACX5448

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Article ID: KB36398 KB Last Updated: 30 Dec 2020Version: 1.0
Summary:

This article explains how to mount a USB drive on an ACX5448 device and copy files from it. This article also provides the steps to copy files from vmhost to Junos.

Solution:

The following procedure allows users to mount a USB device on an ACX5448 device.  This can be helpful if network connectivity is unavailable and you need to copy files to or from the device.

Note: It is recommended to have USB with FAT32 format. USB is not detected on ACX5448 in shell/privilege mode. ACX5448 is a platform where Junos runs as vm on wrl. Login to vhclient is needed to capture the USB activity.
  1. Enter the shell as root:

    user@router> start shell user root
    Password:
    root@router:/var/home/labroot #  vhclient -s
    Last login: day Month date <timestamp> from router on pts/2
    root@router-node:~#
  2. Before inserting the USB device, perform the following:

    root@router-node:~# ls /dev/sd*
    /dev/sda   /dev/sda2  /dev/sda4  /dev/sda6  /dev/sdb1  /dev/sdb3  /dev/sdb5  /dev/sdc
    /dev/sda1  /dev/sda3  /dev/sda5  /dev/sdb   /dev/sdb2  /dev/sdb4  /dev/sdb6
  3. Insert the USB drive in the USB port. The following output provides info of USB attach:

    root@router-node:~# dmesg | tail
    [  493.244240] scsi 6:0:0:0: Direct-Access     JetFlash Transcend 16GB   1100 PQ: 0 ANSI: 6
    [  493.244468] sd 6:0:0:0: Attached scsi generic sg2 type 0
    [  493.245149] sd 6:0:0:0: [sdc] 30197760 512-byte logical blocks: (15.5 GB/14.4 GiB)
    [  493.245876] sd 6:0:0:0: [sdc] Write Protect is off
    [  493.245879] sd 6:0:0:0: [sdc] Mode Sense: 43 00 00 00
    [  493.246653] sd 6:0:0:0: [sdc] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
    [  493.251845]  sdc: sdc1   <<<<<< location
    [  493.254346] sd 6:0:0:0: [sdc] Attached SCSI removable disk   <-- USB
     
    root@router-node:~# ls /dev/sd*
    /dev/sda   /dev/sda2  /dev/sda4  /dev/sda6  /dev/sdb1  /dev/sdb3  /dev/sdb5  /dev/sdc
    /dev/sda1  /dev/sda3  /dev/sda5  /dev/sdb   /dev/sdb2  /dev/sdb4  /dev/sdb6  /dev/sdc1 
    Note: '/dev/sdc1' is the USB drive. 
  4. Create a directory for the USB drive to mount to:

    root@router-node:~# mkdir /var/tmp/usb
  5. Mount the USB drive to the /var/tmp/usb directory:

    root@router-node::~# mount /dev/sdc1 /var/tmp/usb/
  6. Check the USB files after mounting the USB:

    root@router-node: ls /var/tmp/usb
    System Volume Information  images.tgz   <--- USB files

    Note: 'ls /var/tmp/usb' will show all the files in the USB drive.

  7. Copy any of the USB files to the /var/tmp/usb directory:

    root@router-node: cp /var/tmp/usb/images.tgz /var/tmp
    root@router-node: ls /var/tmp
    images.tgz

    The images.tgz file from the USB is successfully copied to the /var/tmp directory.

  8. To move the file from vmhost to Junos, copy the files to /var/log or /var/crash in vhclient:

    root@router-node:~# cp /var/tmp/images.tgz /var/crash/
    root@router-node:~# ls -l /var/crash/images.tgz
    -rw------- 1 root root 2881405 <timestamp> /var/crash/images.tgz
     
    root@router-node:~# exit
    logout
    rlogin: connection closed
    root@router:/var/home/labroot # cli
  9. Now logged into CLI mode, use the following command to copy files from vmhost to Junos:

    user@router> request vmhost file-copy crash from-jnode images.tgz to-vjunos /var/tmp/images.tgz
    user@router> file list /var/tmp/images.tgz
    /var/tmp/images.tgz
     
    user@router> file list /var/tmp/images.tgz detail
    -rw-------  1 root  wheel    2881405 <timestamp> /var/tmp/images.tgz
    total files: 1
    File copied successfully to Junos location /var/tmp/
    Reference link: request vmhost copy vjunos-to-jnode  
  10. Unmount the USB drive after the file is completely copied:

    Enter the shell as root:

    user@router> start shell user root
    Password:
    root@router:/var/home/labroot #  vhclient -s
    Last login: day Month date <timestamp> from router on pts/2
    root@router-node:~#
    root@router-node: umount /var/tmp/usb
    Note: ‚ÄčEnsure the USB devices are unmounted properly before removing them from the router. For devices with multiple USBs, be sure to unmount both devices.
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