[c-nsp] OIR on 7600s: Pretty much evil?

[Mikael Abrahamsson]

On Thu, 11 Nov 2010, chip wrote:

> What's the time length on the bus stall?  Working on re working lots of
> timers, hadn't thought of this.  Something to add to the tests.

The bus is stalled all the time during the insertion. There is a few 
millimeters of "insertion length" where the bus is stalled. If you're 
rapid and firm in the insertion, you get a few tens of milliseconds of 
stall. If you do it wrong and the car gets stuck in that position of the 
stall, the bus will be stalled until the linecard is removed.

> --chip
>
> On Thu, Nov 11, 2010 at 9:55 AM, Geoffrey Pendery <geoff at pendery.net> wrote:
>
>> I'll second Gert - I've personally performed close to 100 OIRs on a
>> variety of 6500 chassis, and never had it cause a problem.
>>
>> There was a previous thread almost exactly like this, BTW - if you
>> feel like searching the archive.  It was half-filled with "OIR always
>> fails, I call it Online Insert and Reboot!" and half-filled with "I've
>> never had a problem, ever.  Works like a charm."  A couple people
>> explained the bus stall behavior:
>> As you're sliding the blade in, it stalls the bus when it first makes
>> contact, then releases the stall once it's all the way in.
>>
>> My take-away from that thread was that it's a self-fulfilling
>> prophecy:  The techs who approach it confidently, expecting no
>> problems, slide the blade in quickly and experience none.  The techs
>> who are worried and skeptical, slide the blade in slowly and
>> cautiously - and their caution leads to a reboot.
>>
>> That said, the others in this thread are also correct - if your RP is
>> doing stuff on tight timers, especially BFD, even a very short bus
>> stall can still be service impacting.  And of course, it's better to
>> plan a maintenance window expecting problems and be pleasantly
>> surprised than to assume it's no big deal and get hit with an outage.
>>
>>
>> -Geoff
>>
>>
>> On Thu, Nov 11, 2010 at 2:00 AM, Gert Doering <gert at greenie.muc.de> wrote:
>>> Hi,
>>>
>>> On Wed, Nov 10, 2010 at 03:01:21PM -0700, John Neiberger wrote:
>>>> I'm just curious to hear your thoughts on OIR on this platform. Is
>>>> this something that you prefer to avoid? Do you have any OIR-related
>>>> horror stories you'd like to share?
>>>
>>> On 6500/7600 (and 7200), we *never* had any issues.
>>>
>>> On 7500, the "R" in "OIR" translates to "Reboot".
>>>
>>> gert
>>> --
>>> USENET is *not* the non-clickable part of WWW!
>>>                                                           //
>> www.muc.de/~gert/
>>> Gert Doering - Munich, Germany
>> gert at greenie.muc.de
>>> fax: +49-89-35655025
>> gert at net.informatik.tu-muenchen.de
>>>
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>>
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>
>
>
> -- 
> Just my $.02, your mileage may vary,  batteries not included, etc....
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-- 
Mikael Abrahamsson    email: swmike at swm.pp.se