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From Andrija Panic <>
Subject Re: Controlled shutdown post-partial-switch failure...
Date Mon, 17 Jun 2019 13:19:24 GMT
Been there, done that, a year ago (whole DC down == everything shutting
down (storage things, S3 things, CloudStack things (all VMs and
everything), etc, etc, etc) - very successfully but not funny...)

On Mon, 17 Jun 2019 at 14:33, David Merrill <>

> Hi All,
> I’m fielding an worrisome emergency situation where a set of (2) stacked
> switches (serving the MGMT & SAN networks) has partially failed (one of the
> stack members was ejected).
> Here’s what I’ve got:
>   *   The Xen hosts 2 MGMT NICs are bonded (active-passive) and connected
> to both switches
>   *   The Xen hosts 2 SAN NICs are NOT bonded and connected to both
> switches
>   *   PUB/GUEST NICs are connected to a different set of stacked switches
> (and  are fine)
> Amazingly CloudStack has survived (guest VMs are still running, there’s
> been no disk issues).
> However I’ve got one compute-cluster (of 6 Xen hosts) in an alert state
> (as the pool master is affected) in the CloudStack UI (and cannot manage
> guests there) and I cannot get to their MGMT interfaces (going to hop on
> the hosts today and get more intel).
> A replacement switch is arriving in 24 hours & I’m preparing the
> switch-swap process.
> I’d REALLY like to shut everything down (guest VM’s) before mucking about
> with the switch-stack serving the SAN network, but I think I have to get to
> the host MGMT NICs sorted first (my suspicion is that the bonded MGMT NICS
> haven’t failed over – due t the nature of the switch failure maybe? – I’m
> considering pulling the MGMT NIC connections on the failed switch to see if
> I can get a path back).
> Anyway, not really much of an ask here, talking myself through it as I
> ride the tiger.
> Thanks.
> David
> David Merrill
> Senior Systems Engineer,
> Managed and Private/Hybrid Cloud Services
> 92 Oak Street, Portland ME 04101
> office 207.772.5678<callto:207.772.5678>
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Andrija Panić

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