[j-nsp] Host 0 boot from Alternate media on M10 Alarm

[Jonas Frey]

Well, its not uncommon that CF goes bad after time. You will usually not
notice this while normal operation since there are very very few
read/writes to the CF. When you update junos there are alot of
read/writes to the CF thus this is where 95% of CF failures are to be
expected. There is no monitoring within JunOS to check if the CF is good
over time...this is only true for the harddisk where SMART is running
(but it doesnt help all the time...).
You can manually check the CF with either the routing-engine diagnostics
(read only test) or try "request system snapshot". The later will also
write to the CF. We have had CF failures which were not detected by just
read tests but all were clearly visible when doing a snapshot.

Regards,
Jonas

On Sun, 2007-12-23 at 18:04, David Ball wrote:
>   The same happened to me when going from 8.2R1.7 to 8.5R1.13 and also
> from 8.5R1.13 to 8.5R1.14 (not coincidentally on the same chassis).  I
> have a ticket open with JTAC.
> 
> David
> 
> 
> On 23/12/2007, Jonas Frey <jf at probe-networks.de> wrote:
> > Hello,
> >
> > you can run diagnostics on the routing engine with:
> > request chassis routing-engine diagnostics ?
> >
> > It appears like your flash is bad.
> >
> > Try: request system snapshot then request system reboot
> >
> > Try: start shell user root
> > type:
> > sysctl -w machdep.bootdevs=pcmcia-flash,compact-flash,disk,lan
> > exit
> > Reboot after this. If the system still comes on from alternate media
> > then you cf is bad.
> >
> > Regards,
> > Jonas
> >
> >
> > On Sun, 2007-12-23 at 16:20, Mohd Irwan wrote:
> > > Good Day All,
> > >
> > > I've situation here which the alarm appear to be like this :
> > >
> > > run show chassis alarms
> > > 1 alarms currently active
> > > Alarm time               Class  Description
> > > 2007-12-23 20:13:00 MYT  Minor  Host 0 Boot from alternate media
> > >
> > > May I know how should I tackle this problem as it appear from M10? I'm new
> > > with Juniper Equipment
> > >
> > > Regards
> > >
> > > Irwan
> > > Time Dot Net
> > >
> >
> >
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