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Date: Mon, 4 Aug 2014 10:47:46 +0100 (BST)
From: Andrei Mikhailovsky <andrei@arhont.com>
To: users@cloudstack.apache.org
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Subject: Re: CS 4.2..1 hypervisor KVM migrate to CS 4.4 hyper-visor
 XenServer 6.2
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Thread-Topic: CS 4.2..1 hypervisor KVM migrate to CS 4.4 hyper-visor XenServer
 6.2
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Daan, 

We are sticking to KVM because XenServer's dom0 is not 64bit, and I can't compile the QLogic infiniband drivers. Additionally, XenServer doesn't support ceph/rbd storage backend yet, which we use for our vm images. 

Regarding the KVM, I've not had too many issues with networking. I am also unhappy about the snapshots issue. You can take volume snapshots, but they are so clunky and terribly slow which makes the whole snapshotting business for KVM virtually unusable. I just can't imagine tens of virtual machines doing snapshotting at the same time. It might take days (((. It's also too bad you can't store snapshots on the primary storage yet because of the bug in ACS which I do not believe has been fixed. 

Andrei 


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Andrei Mikhailovsky 
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----- Original Message -----

From: "Daan Hoogland" <daan.hoogland@gmail.com> 
To: users@cloudstack.apache.org 
Sent: Monday, 4 August, 2014 8:46:45 AM 
Subject: Re: CS 4.2..1 hypervisor KVM migrate to CS 4.4 hyper-visor XenServer 6.2 

Motty, 

Before you upgrade read Eric's gist on this first: 
https://gist.github.com/terbolous/102ae8edd1cda192561c 

On Mon, Aug 4, 2014 at 1:25 AM, motty cruz <motty.cruz@gmail.com> wrote: 
> Thank you Andrei, 
> I will do look that up, I am nervous about this operation. I wonder why did 
> you go to KVM hypervisor? we're having issues, our network is not stable. I 
> could not take snapshots of VMs. At this point we build a cluster with 
> XenServer hypervisor and we really like to go into production. 
> 
> Any advise? by the way our current version is CloudStack 4.2.1, I believe 
> snapshots are working in 4.3. I may try to upgrade to Cloudstack 4.4. Do 
> you know if we can upgrade from 4.2 to 4.4? (skip a version) 
> 
> Thanks, 
> 
> 
> On Sat, Aug 2, 2014 at 3:29 AM, Andrei Mikhailovsky <andrei@arhont.com> 
> wrote: 
> 
>> Hi, 
>> 
>> I have migrated the other way without any issues. The fastest way for me 
>> to do it was to create identical vms on the other hypervisor (including 
>> same disk volume sizes, etc). Once the vms are created I would stop them. 
>> Using the qemu-img I would convert the disk image format, upload the 
>> converted image to the primary storage and replace the newly created disk 
>> volumes with the converted once. After that you should be okay to start. 
>> 
>> You might also want to try the citrix app for vm migration, it might 
>> support kvm format. Just google for it, I can't recall its name. 
>> 
>> Andrei 
>> 
>> -- 
>> Andrei Mikhailovsky 
>> Director 
>> Arhont Information Security 
>> 
>> Web: http://www.arhont.com 
>> http://www.wi-foo.com 
>> Tel: +44 (0)870 4431337 
>> Fax: +44 (0)208 429 3111 
>> PGP: Key ID - 0x2B3438DE 
>> PGP: Server - keyserver.pgp.com 
>> 
>> DISCLAIMER 
>> 
>> The information contained in this email is intended only for the use of 
>> the person(s) to whom it is addressed and may be confidential or contain 
>> legally privileged information. If you are not the intended recipient you 
>> are hereby notified that any perusal, use, distribution, copying or 
>> disclosure is strictly prohibited. If you have received this email in error 
>> please immediately advise us by return email at andrei@arhont.com and 
>> delete and purge the email and any attachments without making a copy. 
>> 
>> 
>> ----- Original Message ----- 
>> 
>> From: "Soeren Malchow" <soeren.malchow@mcon.net> 
>> To: users@cloudstack.apache.org 
>> Sent: Friday, 1 August, 2014 8:01:05 PM 
>> Subject: RE: CS 4.2..1 hypervisor KVM migrate to CS 4.4 hyper-visor 
>> XenServer 6.2 
>> 
>> Hi, 
>> 
>> i am running 4.3 right now with KVM and snapshots do work 
>> 
>> cheers 
>> soeren 
>> 
>> -----Original Message----- 
>> From: motty cruz [mailto:motty.cruz@gmail.com] 
>> Sent: Freitag, 1. August 2014 20:09 
>> To: users@cloudstack.apache.org 
>> Subject: CS 4.2..1 hypervisor KVM migrate to CS 4.4 hyper-visor XenServer 
>> 6.2 
>> 
>> All, 
>> I am figuring out best possible way to migrate from CS 4.2.1 hyper-visor 
>> KVM to CS 4.4 hyper-visor XenServer 6.2 
>> 
>> any suggestions? We're having issues with KVM, snapshot don't work, I have 
>> a testing cluster for CS 4.4 with hyper-visor Xen and seem to be a lot 
>> better than KVM 
>> 
>> Thanks, 
>> 
>> 


-- 
Daan 


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