[j-nsp] M120 Boot Up Error

[Nalkhande Tarique Abbas]

Abhijeet,

The error you observed is simply due to the fact that CF (ad0) is your
primary boot device & your router has root (/) mounted on hard disk
(ad2)

root at lab-RE1% sysctl -a | grep bootdevs
machdep.bootdevs: usb,compact-flash,disk,lan

You need to verify couple of things before rectifying it..

If you see CF but its missing from bootlist (use the above command to do
so)

If so, you need to manually mount it back as below

sysctl -w machdep.bootdevs=usb,compact-flash,disk,lan

If its present in bootlist but corrupted skip the above & proceed with
below

Now you can initiate a "request system snapshot" 

Pls go through the below for more details.. 

http://www.juniper.net/techpubs/software/junos/junos90/swcmdref-basics-s
ervices/request-system-snapshot.html


Reboot RE for bootlist to be revaluated.


Hope it helps!


 
Thanks & Regards,
Tarique A. Nalkhande

-----Original Message-----
From: juniper-nsp-bounces at puck.nether.net
[mailto:juniper-nsp-bounces at puck.nether.net] On Behalf Of Abhi
Sent: Tuesday, August 18, 2009 8:09 PM
To: Juniper Puck
Subject: [j-nsp] M120 Boot Up Error

Hi 

we have 2 M120 router each with 2 RE; all the 4 RE while booting
initially are throwing the following messages.

mountroot>
panic: Root mount failed, startup aborted.
db_log_stack_trace_cmd(c0d196c0) at 0
panic(c0c62be0,c7734ca8,c0514dba,0,f3cd8d10) at 0
vfs_mountroot(c7734ca8,c7735600,debdfb38,3c620096,9714cfea) at 0
start_init(0,f3cd8d38) at 0
fork_exit(c0514dba,0,f3cd8d38) at 0
fork_trampoline() at 0
--- trap 0x1, eip = 0, esp = 0xf3cd8d6c, ebp = 0 ---
KDB: enter: panic
[thread pid 1 tid 100006 ]
Stopped at      kdb_enter+0x37: pushl   $-0x1
db>
db>reset

after i get this message i type in "reset" then the RE reboots and this
time it boots from image from Hard Disk and gives message

JUNOS 8.5R1.13 built 2007-11-14 18:00:01 UTC
---
--- NOTICE: System is running on alternate media device  (/dev/ad2s1a).

on thing i have figured out is the image on flash has corrupted somehow
for all the RE's.

How do i correct this situation?

Thanks in Advance

 Regards
Abhijeet.C
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