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[PTX] Alternate method to boot vmhost from backup SSD

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Article ID: KB35497 KB Last Updated: 26 Feb 2020Version: 1.0
Summary:

In the instances when vmhost based PTX platforms are unable to complete boot process, a user can try to boot the device from alternate SSD using the method described in this article.

Symptoms:

After performing 'request vmhost reboot' (for any purpose like upgrade or scheduled maintenance), PTX device stays in boot loop.

Solution:
  1. Power off the device.

  2. Interrupt boot sequence when the following menu appears:

    InsydeH2O version : V0018.8YBIOS Build Date : 10/21/2016System Memory Speed : 1600 MHzProcessor Type : Intel(R) Xeon(R) CPU  @ 2.50GHz
    CPUID​: 306A9
    Press Esc for boot options  
    
     Press "Esc"
  3. Select "Boot Manager" from following menu:

    0C75                                                                           
    Intel(R) Xeon(R) CPU  @ 2.50GHz                                       2.50 GHz 
    V0018.8Y                                                          32768 MB RAM  
    Continue                                             
    Boot Manager  <-- This selection will take you to the Boot Manager. Use 'down' arrow key to select 'Boot Manager'                                
    Device Manager                                         
    Boot From File                                                      
    Setup Utility                                                                                                                     
  4. Select "EFI HDD device 1 " from following options:

    Boot Option Menu​
    EFI HDD Device (SFSA050GM3AA2TO-C-LB-24A-JUN)​
    EFI HDD Device 1 (SFSA050GM3AA2TO-C-LB-24A-JUN)​  << Select this option
    EFI Network 0 for IPV4 (D0-DD-49-4C-80-08)
    EFI Network 1 for IPV4 (D0-DD-49-4C-80-09)
    Internal EFI Shell
  5. Press Enter.

    The device will complete the boot process.

    The following prompt will appear once the boot process is complete:

    FreeBSD/amd64 (Amnesiac) (ttyu0)
    
    login: root
    
    --- JUNOS 17.4R2.4 Kernel 64-bit  JNPR-11.0-20180730.2cd3a6e_buil
    Note: VM Host is Currently running from alternate disk <<
    root@:~ # cli
    
    root> show chassis alarms
    2 alarms currently active
    Alarm time               Class  Description
    2020-02-18 15:32:30 UTC  Major  FPC Management2 Ethernet Link Down
    2020-02-18 15:30:02 UTC  Minor  VMHost 0 Boot from alternate disk   <-- This alarm shows device is booted from alternate partition
    
    root> show vmhost version
    Current root details,           Device sdb, Label: jrootp_S, Partition: sdb3
    Current boot disk: Secondary  <<
    Current root set: p
    UEFI    Version: V0018.8Y
    
    Secondary Disk, Snapshot Time: <fresh install>
    
    Version: set p
    VMHost Version: 3.1539
    VMHost Root: vmhost-x86_64-17.4R2-20180803_0115_builder
    VMHost Core: vmhost-core-x86_64-17.4R2-20180816_1416_builder
    kernel: 3.10.100-ovp-rt110-WR6.0.0.31_preempt-rt
    Junos Disk: junos-install-ptx-x86-64-17.4R2.4
    
    Version: set b
    VMHost Version: 3.1539
    VMHost Root: vmhost-x86_64-17.4R2-20180803_0115_builder
    VMHost Core: vmhost-core-x86_64-17.4R2-20180816_1416_builder
    kernel: 3.10.100-ovp-rt110-WR6.0.0.31_preempt-rt
    Junos Disk: junos-install-ptx-x86-64-17.4R2.4​

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