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From Andrija Panic <andrija.pa...@gmail.com>
Subject Re: slow nfs = reboot all hosts (((
Date Fri, 09 Oct 2015 09:25:05 GMT
I managed this problem the folowing way:
http://admintweets.com/cloudstack-disable-agent-rebooting-kvm-host/

Cheers
On Oct 9, 2015 10:21 AM, "Andrei Mikhailovsky" <andrei@arhont.com> wrote:

> Hello
>
> My issue is whenever my nfs server becomes slow to respond, ACS just
> bloody reboots ALL hosts servers, not just the once running vms with
> volumes attached to the slow nfs server. Recently, i've decided to remove
> some of the old snapshots to free up some disk space. I've deleted about a
> dozen snapshots and I was monitoring the nfs server for progress. At no
> point did the nfs server lost the connectivity, it just became a bit slow
> and under load. By slow I mean i was still able to list files on the nfs
> mount point and the ssh session was still working okay. It was just taking
> a few more seconds to respond when it comes to nfs file listings, creation,
> deletion, etc. However, the ACS agent has just rebooted every single host
> server, killing all running guests and system vms. In my case, I only have
> two guests with volumes on the nfs server. The rest of the vms are running
> off rbd storage. Yet, all host servers were rebooted, even those which were
> not running guests with nfs volumes.
>
> Ever since i've started using ACS, it was always pretty dumb in correctly
> determining if the nfs storage is still alive. I would say it has done the
> maniac reboot everything type of behaviour at least 5 times in the past 3
> years. So, in the previous versions of ACS i've just modified the
> kvmheartbeat.sh and hashed out the line with "reboot" as these reboots were
> just pissing everyone off.
>
> After upgrading to ACS 4.5.x that script has no reboot command and I was
> wondering if it is still possible to instruct the kvmheartbeat script not
> to reboot the host servers?
>
> Thanks for your advice.
>
> Andrei
>

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