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From Frank Louwers <>
Subject RE: CS Manager down: all hypervisors reboot
Date Wed, 19 Aug 2015 18:48:03 GMT
On 19 Aug 2015 at 20:44:47, Somesh Naidu ( wrote:
Management server down would not result in host being rebooted. Primary storage down will. 

As you mentioned, you have hosted your primary storage (NFS) on the management server node.
So yes, taking it down will cause all host connected to it to reboot. It doesn’t matter
how many VMs use that particular storage. 

I am sure if there is a better way of doing this but you could modify "" to
disable reboot on loosing primary storage connection. 
HI Somesh,

Thanks for the explanation!

Am I right that (after reading your mail and by
Marcus) that this will happen even if no VMs on the host set to “HA”?

What would then be the procedure to perform maintenance on the (first?) primary NFS storage
server and how would this work if primary storage were eg iSCSI?

That sill would not explain why the “dedicated” hosts didn’t reboot, but I assume I
should take a look at then. Is there no way to disable that, except for modifying




-----Original Message----- 
From: Frank Louwers [] 
Sent: Wednesday, August 19, 2015 12:19 PM 
Subject: CS Manager down: all hypervisors reboot 

Hi all, 

We had an interesting outage this morning. We took the Cloudstack Manager node down for hardware
upgrades and kernel updates, and it seems all “non-dedicated” hosts rebooted. 

We run KVM on CS 4.4.latest. 

Is this “normal behaviour”, why does it do that, and how do I disable that? 

The Manager is also a primary storage provider (NFS export), but all VMs use local storage
(except 1). 



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