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From Geoff Higginbottom <geoff.higginbot...@shapeblue.com>
Subject RE: Strange instance boot issue
Date Mon, 08 Dec 2014 09:42:30 GMT
Hi Allesandro,

This is just a hunch, but could it be that Windows only uses its 1st CPU to handle the boot
process.  If this is the case when you allocate 4vCPU @ 500Mhz it only has 500Mhz of CPU power
to process the very intensive boot process, vs having 2000Mhz when you allocate a single vCPU
@ 200MHz.

I believe it's always better to provide a faster single vCPU than multiple Slower vCPUs as
there are overheads on the Guest OS and Hypervisor when dealing with multiple vCPUs.

Regards

Geoff Higginbottom

D: +44 20 3603 0542 | S: +44 20 3603 0540 | M: +447968161581

geoff.higginbottom@shapeblue.com

-----Original Message-----
From: Alessandro Caviglione [mailto:c.alessandro@gmail.com]
Sent: 08 December 2014 02:20
To: users@cloudstack.apache.org
Subject: Re: Strange instance boot issue

Ok... maybe I found the issue!!
Again... I'm learning CS in these month so you've to be patient with me! :) But this thing
is strange...
I configure some Compute offering setting CPU speed to 500 MHz and changing vCPU number for
each offer, all the offerings are with CPU CAP enabled.
Now, if I deploy a W2008R2 instance from a template or an ISO (yes....
W2012 is working fine! :-/) with 4vCPU (4*500 MHz = 2 GHz) I get the issue... sloooooow boot
time (about 15 mins).
If I deploy the same instance with 1 vCPU with 2000 MHz, the instance boot in 7 sec!!
Why???

On Sun, Dec 7, 2014 at 1:49 AM, Alessandro Caviglione < c.alessandro@gmail.com> wrote:

> Hi guys,
> I'm sorry if I submit this problem, I honestly do not think it is a
> fault of CloudStack, but I do not know where to look anymore ...
> For several days (up to a week ago I did not have this problem) I have
> trouble creating templates and run instances.
> My infrastructure is composed of CS4.4.1 and 4 XenServer 6.2 hosts.
> I want to point out that the problem is not due to poor storage
> performance.
> When I create an instance from an ISO, the installation time is
> greatly increased.
> When restarting the instances, for example windows VMs, they remain in
> the boot about 30 minutes.
> The strange thing is that when instances are started, the performances
> are excellent!
> What's even more strange is that trying to install a new VM directly
> from XenServer, installation is fast and the boot issue when restart
> the VMs does not appear and also boot is very fast (about 20/30 sec.)
> In short, the problem seems to be only when the VMs are managed by
> CloudStack.
> I found this article and correct the BIOS of my server, even though I
> had never encountered this problem until a week ago. (
> http://support.citrix.com/article/CTX127395)
>
>
> Someone can give me some guidance?
>
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