Junos
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Junos

Request system snapshot different scenarios

‎12-02-2018 04:54 PM

Hi everyone, 

 

I am trying to understand snapshot feature,  stumbled upon this tread :

https://forums.juniper.net/t5/Junos/request-system-snapshot-slice-alternate/td-p/318484

 

I have some questions:

Depending upon platform,    secondary media could be hard disk, USB . removeble compact flash drive.

 

1)Let say JUNOS machine cannot boot up from primary , therefore start looking  to boot from secondary media, but questions is we can have more than one secondary media such as hard drive,  USB drive.

 

In such situation, do we have some defaults for JUNOS machine to decide  whether to check hard drive or USB next?

 

 

2)  Let say we have M series router,  with usb and hard drive both present.

Machine boots from primary flash, and we issue following command:

request system snapshot.

 

Where  will the / (root) and /config from flash be copied into?  USB or hard disk?

 

I mayhave some more questions depening upon the response  .

 

Thanks and have a nice evening!!

 

 

 

 

 

 

8 REPLIES 8
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Junos

Re: Request system snapshot different scenarios

‎12-31-2019 02:53 PM

for point # 2, 

request system snapshot media usb would snapshot onto USB

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Junos

Re: Request system snapshot different scenarios

‎12-31-2019 02:54 PM

for point # 2, 

request system snapshot media slice alternate 

would snapshot on the other partition of disk. 

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Junos

Re: Request system snapshot different scenarios

‎12-31-2019 02:56 PM

for point # 1, 

The M Series, MX Series (except for the MX80 routers and the MX104 routers), T Series, and TX Matrix routers with a Routing Engine that has a hard disk attempt to boot from the storage media in the following order:

  1. Removable media emergency boot device, such as a PC Card (if present)
  2. CompactFlash card (if present)
  3. Hard disk. 
 
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Junos

Re: Request system snapshot different scenarios

‎12-31-2019 02:56 PM

related to point # 1, 

 

The M Series and MX Series with a Routing Engine that has a solid-state drive (SSD) attempt to boot from the storage media in the following order:

  1. USB media emergency boot device (if present)
  2. CompactFlash card
  3. Solid-state drive (SSD) in the SSD slot 1 or SSD slot 2 (if present)
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Junos

Re: Request system snapshot different scenarios

‎12-31-2019 02:57 PM

for point # 1, 

 

MX80 routers attempt to boot from the storage media in the following order:

  1. USB media emergency boot device
  2. Dual, internal NAND flash device (first da0, then da1)
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Junos

Re: Request system snapshot different scenarios

‎12-31-2019 02:57 PM

MX104 routers attempt to boot from the storage media in the following order:

  1. USB storage media device
  2. Internal NAND flash device (da0)
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Junos

Re: Request system snapshot different scenarios

‎12-31-2019 02:58 PM

Related to Question # 1, 

Boot sequence for other platforms can be different. 

 

The T Series routers with a Routing Engine that has a solid-state drive (SSD), and TX Matrix Plus routers attempt to boot from the storage media in the following order:

  1. USB media emergency boot device
  2. CompactFlash card (if present)
  3. Solid-state drive (SSD) in the Disk 1 slot (if present)
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Junos

Re: Request system snapshot different scenarios

‎12-31-2019 02:59 PM

The PTX Series Packet Transport Routers attempt to boot from the storage media in the following order:

  1. USB media emergency boot device
  2. CompactFlash card
  3. Solid-state drive (SSD) in the Disk 1 slot (if present)
  4. Storage media available on the LAN   <<<<<>>>>>