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Host 0 Boot from backup root alarm

  • 1.  Host 0 Boot from backup root alarm

    Posted 12-22-2020 03:44

    Hi,

    i'm getting the alarm below on my ACX4000 device, what can i do to resolve this issue? Below more info about the device :

    1 alarms currently active
    Alarm time Class Description
    2020-07-09 07:01:59 UTC Minor Host 0 Boot from backup root

    Model: acx4000
    Family: junos
    Junos: 17.3R3-S2.2

    > show system storage partitions

    Boot Media: internal (da0)
    Active Partition: da0s1a
    Backup Partition: da0s2a
    Currently booted from: backup (da0s2a)

    Partitions information:
    Partition Size Mountpoint
    s1a 872M altroot
    s1e 92M altconfig
    s2a 872M /
    s2e 92M /config
    s3d 447M /var/log
    s3f 3.9G /var
    s4b unused (swap)
    s4h 15M unused (swap)

    thx in advance



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    DEMNA IMAD
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  • 2.  RE: Host 0 Boot from backup root alarm

     
    Posted 12-22-2020 03:57

    Hello,

    It is likely that the file system became corrupted due to a sudden power loss or an ungraceful shutdown.

    When the primary partition detects a corruption, the device boots from the backup partition; which then becomes the active partition.
    The purpose of this alarm is to inform the users that the device is rebooted from the backup partition so that the administration should take necessary actions to repair the primary partition."

    Ref
    Switch boots from backup root partition after file system corruption occurred on the primary root partition
    https://kb.juniper.net/InfoCenter/index?page=content&id=KB23180

    The above document talks about and EX switch but it also applies to the ACX platform.

    Regards




  • 3.  RE: Host 0 Boot from backup root alarm

    Posted 12-22-2020 04:06

    Hello bbeshay,

    some commands aren't supported by the ACX like request system snapshot media internal slice alternate.

    there is no "internal" option on ACX device

    W_Wallix@ACX4000_KBG095> request system snapshot media ?
    Possible completions:
    usb                                      Write snapshot to device connected to USB port
    W_Wallix@ACX4000_KBG095> request system snapshot media



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    DEMNA IMAD
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  • 4.  RE: Host 0 Boot from backup root alarm

     
    Posted 12-22-2020 04:21

    The correct syntax is:

    request system snapshot slice alternate



  • 5.  RE: Host 0 Boot from backup root alarm

    Posted 12-22-2020 05:38

    Another question please,

    as described on the document this command will repair the primary partition and alarm will be still active.

    1- is it sure that this command has no service impact ? because there are several B2B clients on that switch

    2- How to clear the alarm?

    Thx in advance



    ------------------------------
    DEMNA IMAD
    ------------------------------



  • 6.  RE: Host 0 Boot from backup root alarm

     
    Posted 12-22-2020 05:58
    -------------------------------------------
    Original Message:
    Sent: 12-22-2020 05:37
    From: DEMNA IMAD
    Subject: Host 0 Boot from backup root alarm


    This command should have no service impact as it's an attempt to take a snapshot from the active slice to the alternate slice.

    If Copying goes successfully, a reboot is required to boot the device from the old primary partition.

    Another question please,

    as described on the document this command will repair the primary partition and alarm will be still active.

    1- is it sure that this command has no service impact ? because there are several B2B clients on that switch

    2- How to clear the alarm?

    Thx in advance



    ------------------------------
    DEMNA IMAD



  • 7.  RE: Host 0 Boot from backup root alarm

    Posted 12-22-2020 06:32

    it's clear, thanks a lot for your support beshay



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    DEMNA IMAD
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