Yanking Compact Flash while the router is up...

So, I am curious, can you pull a CF card from a 2821 while
the router
is up and running?

We need to replace flaky flash with a new one, but I would
rather not
have to talk a remote tech (low skillset) through a ROMMON
TFTP
operation..

If not, we can do it the hard way....but I have heard rumors
that it works...

If it does, what are the risks...



Jonathan
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Some machines have enough flash built in to accept
downgraded IOS.  Swap the
external flash.  Power up, then upgrade the IOS again. 

> -----Original Message-----
> From: cisco-nsp-bouncespuck.nether.net 
> [mailto:cisco-nsp-bouncespuck.nether.net] On Behalf
Of 
> Jonathan Charles
> Sent: Friday, May 25, 2007 15:45
> To: ciscovoip; cisco-nsppuck.nether.net
> Subject: [c-nsp] Yanking Compact Flash while the router
is up...
> 
> So, I am curious, can you pull a CF card from a 2821
while 
> the router is up and running?
> 
> We need to replace flaky flash with a new one, but I
would 
> rather not have to talk a remote tech (low skillset)
through 
> a ROMMON TFTP operation..
> 
> If not, we can do it the hard way....but I have heard
rumors 
> that it works...
> 
> If it does, what are the risks...
> 
> 
> 
> Jonathan
> _______________________________________________
> cisco-nsp mailing list  cisco-nsppuck.nether.net 
> ht
tps://puck.nether.net/mailman/listinfo/cisco-nsp
> archive at http://pu
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> 
> --
> Scanned for viruses and dangerous content at 
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> 
> 


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I'd definitely go with planned downtime, instead of
experimenting, but  
if you have a prepared flash (same IOS, same configs, same
files), it  
might just work.

AFAIK a running router shouldn't really use it's flash. [for
the short  
time, while you change it] Whatever is used from the IOS
should be  
preloaded in memory at boot (I know a *nix kernel behaves
like that, I  
suppose something similar from the IOS, based on the boot-up
sequence).

But if your router is so critical, that you don't want to
power it off  
for the flash change, I'd experiment on a different router
first ... ;)

regards,
   Zoltan

Quoting Ray Burkholder <rayoneunified.net>:

> Some machines have enough flash built in to accept
downgraded IOS.  Swap the
> external flash.  Power up, then upgrade the IOS again.
>
>> -----Original Message-----
>> From: cisco-nsp-bouncespuck.nether.net
>> [mailto:cisco-nsp-bouncespuck.nether.net] On Behalf
Of
>> Jonathan Charles
>> Sent: Friday, May 25, 2007 15:45
>> To: ciscovoip; cisco-nsppuck.nether.net
>> Subject: [c-nsp] Yanking Compact Flash while the
router is up...
>>
>> So, I am curious, can you pull a CF card from a
2821 while
>> the router is up and running?
>>
>> We need to replace flaky flash with a new one, but
I would
>> rather not have to talk a remote tech (low
skillset) through
>> a ROMMON TFTP operation..
>>
>> If not, we can do it the hard way....but I have
heard rumors
>> that it works...
>>
>> If it does, what are the risks...
>>
>>
>>
>> Jonathan
>> _______________________________________________
>> cisco-nsp mailing list  cisco-nsppuck.nether.net
>> ht
tps://puck.nether.net/mailman/listinfo/cisco-nsp
>> archive at http://pu
ck.nether.net/pipermail/cisco-nsp/
>>
>> --
>> Scanned for viruses and dangerous content at
>> http://www.oneunified.net and is believed to be clean.
>>
>>
>
>
> --
> Scanned for viruses and dangerous content at
> http://www.oneunified.net and is believed to be clean.
>
> _______________________________________________
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> cisco-voippuck.nether.net
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ttps://puck.nether.net/mailman/listinfo/cisco-voip
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Well, we just yanked the flash, stuffed in the new one (it
took a good
6 seconds for it to recognize the new flash) and copied the
new
code... rebooted... total network downtime, about three
minutes.



Jonathan

On 5/26/07, kelicarocomp.ro <kelicarocomp.ro> wrote:
> I'd definitely go with planned downtime, instead of
experimenting, but
> if you have a prepared flash (same IOS, same configs,
same files), it
> might just work.
>
> AFAIK a running router shouldn't really use it's flash.
[for the short
> time, while you change it] Whatever is used from the
IOS should be
> preloaded in memory at boot (I know a *nix kernel
behaves like that, I
> suppose something similar from the IOS, based on the
boot-up sequence).
>
> But if your router is so critical, that you don't want
to power it off
> for the flash change, I'd experiment on a different
router first ... ;)
>
> regards,
>    Zoltan
>
> Quoting Ray Burkholder <rayoneunified.net>:
>
> > Some machines have enough flash built in to accept
downgraded IOS.  Swap the
> > external flash.  Power up, then upgrade the IOS
again.
> >
> >> -----Original Message-----
> >> From: cisco-nsp-bouncespuck.nether.net
> >> [mailto:cisco-nsp-bouncespuck.nether.net] On Behalf Of
> >> Jonathan Charles
> >> Sent: Friday, May 25, 2007 15:45
> >> To: ciscovoip; cisco-nsppuck.nether.net
> >> Subject: [c-nsp] Yanking Compact Flash while
the router is up...
> >>
> >> So, I am curious, can you pull a CF card from
a 2821 while
> >> the router is up and running?
> >>
> >> We need to replace flaky flash with a new one,
but I would
> >> rather not have to talk a remote tech (low
skillset) through
> >> a ROMMON TFTP operation..
> >>
> >> If not, we can do it the hard way....but I
have heard rumors
> >> that it works...
> >>
> >> If it does, what are the risks...
> >>
> >>
> >>
> >> Jonathan
> >>
_______________________________________________
> >> cisco-nsp mailing list  cisco-nsppuck.nether.net
> >> ht
tps://puck.nether.net/mailman/listinfo/cisco-nsp
> >> archive at http://pu
ck.nether.net/pipermail/cisco-nsp/
> >>
> >> --
> >> Scanned for viruses and dangerous content at
> >> http://www.oneunified.net and is believed to be clean.
> >>
> >>
> >
> >
> > --
> > Scanned for viruses and dangerous content at
> > http://www.oneunified.net and is believed to be clean.
> >
> > _______________________________________________
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ttps://puck.nether.net/mailman/listinfo/cisco-voip
> >
>
>
>
>
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Works fine in my experience - not to say it won't crash the
router, just 
that I haven't seen it crash a router 

-matt

Jonathan Charles wrote:
> So, I am curious, can you pull a CF card from a 2821
while the router
> is up and running?
> 
> We need to replace flaky flash with a new one, but I
would rather not
> have to talk a remote tech (low skillset) through a
ROMMON TFTP
> operation..
> 
> If not, we can do it the hard way....but I have heard
rumors that it works...
> 
> If it does, what are the risks...
> 
> 
> 
> Jonathan
> _______________________________________________
> cisco-voip mailing list
> cisco-voippuck.nether.net
> h
ttps://puck.nether.net/mailman/listinfo/cisco-voip


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