Change or repair the boot list

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If you get something like this: 

--- JUNOS 7.5R1.12 built 2006-02-05 08:13:09 UTC
---
--- NOTICE: System is running on alternate media device  (/dev/ad1s1a).
---

And see the following in the boot message file: 

DEVFS: ready to run
ad0: not attached, missing in Boot List
ad1: DMA limited to UDMA33, non-ATA66 cable or device
ad1: 28615MB <FUJITSU MHT2030AT> [58140/16/63] at ata0-slave UDMA33
Mounting root from ufs:/dev/ad1s1a</code>

Then you might like to try putting the compact flash (on the RE) back into the boot list. Of course it may be that the flash is actually faulty but I have seen this fix the problem in the past. As root in the shell you might see this: 

% sysctl machdep.bootdevs
machdep.bootdevs: pcmcia-flash,pcmcia-flash-1,disk,lan
%

When it should look like this: 

% sysctl machdep.bootdevs
machdep.bootdevs: pcmcia-flash,pcmcia-flash-1,compact-flash,disk,lan
%

Put the compact flash back in the list like this: 

sysctl -w machdep.bootdevs=pcmcia-flash,pcmcia-flash-1,compact-flash,disk,lan

Note that the actual list will depend on the RE, so it pays to check on a similar RE that is working fine to be certain of the names and order of the boot devices.

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