[cisco-voip] [c-nsp] Yanking Compact Flash while the router is up...

[Jonathan Charles]

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, keli at carocomp.ro <keli at carocomp.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 <ray at oneunified.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-bounces at puck.nether.net
> >> [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of
> >> Jonathan Charles
> >> Sent: Friday, May 25, 2007 15:45
> >> To: ciscovoip; cisco-nsp at puck.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
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