cloudstack-users mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Geoff Higginbottom <>
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.


Geoff Higginbottom

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

-----Original Message-----
From: Alessandro Caviglione []
Sent: 08 December 2014 02:20
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!!

On Sun, Dec 7, 2014 at 1:49 AM, Alessandro Caviglione <> 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. (
> Someone can give me some guidance?
Find out more about ShapeBlue and our range of CloudStack related services

IaaS Cloud Design & Build<>
CSForge – rapid IaaS deployment framework<>
CloudStack Consulting<>
CloudStack Software Engineering<>
CloudStack Infrastructure Support<>
CloudStack Bootcamp Training Courses<>

This email and any attachments to it may be confidential and are intended solely for the use
of the individual to whom it is addressed. Any views or opinions expressed are solely those
of the author and do not necessarily represent those of Shape Blue Ltd or related companies.
If you are not the intended recipient of this email, you must neither take any action based
upon its contents, nor copy or show it to anyone. Please contact the sender if you believe
you have received this email in error. Shape Blue Ltd is a company incorporated in England
& Wales. ShapeBlue Services India LLP is a company incorporated in India and is operated
under license from Shape Blue Ltd. Shape Blue Brasil Consultoria Ltda is a company incorporated
in Brasil and is operated under license from Shape Blue Ltd. ShapeBlue SA Pty Ltd is a company
registered by The Republic of South Africa and is traded under license from Shape Blue Ltd.
ShapeBlue is a registered trademark.
View raw message