migration question

migration question

[Paul Ionescu]

Hi,

I set up xen in 2 vmware separate environments and now I want to play with
domain migration from one vmware to the other.
I don't want to have external iscsi or nfs or other types of NAS but
instead use a small ramdisk.
So I will boot a domain xenU with a small ramdisk which will be it's root,
and then I want to migrate this domain from one vmware to the other.

In the documentation of xen I could not find any mention of this scenario.
Is it supposed to work ?
I mean, we have everything we need in the memory of the xenU domain, so I
suspect is should work.

P.S. I tried with XenCD 1.0 rc1 in both vmware environments, and it did
not work, but I suspect there is something else fishy, because "xm save"
did not work either.
I also saw on the list that some other people have problems with migrating
and saving/restoring domains.




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Re: migration question

[Mark A. Williamson]

<snip>
> So I will boot a domain xenU with a small ramdisk which will be it's root,
> and then I want to migrate this domain from one vmware to the other.
>
> In the documentation of xen I could not find any mention of this scenario.
> Is it supposed to work ?
> I mean, we have everything we need in the memory of the xenU domain, so I
> suspect is should work.

Yes, this should work.  In fact, I've been planning on updating the docs to 
use this as a simple migration example.

Cheers,
Mark

> P.S. I tried with XenCD 1.0 rc1 in both vmware environments, and it did
> not work, but I suspect there is something else fishy, because "xm save"
> did not work either.
> I also saw on the list that some other people have problems with migrating
> and saving/restoring domains.
>
>
>
>
> -------------------------------------------------------
> SF email is sponsored by - The IT Product Guide
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> Xen-devel mailing list
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Re: migration question

[Paul Ionescu]

Hi,

On Tue, 08 Feb 2005 01:55:06 +0000, Mark A. Williamson wrote:

> <snip>
>> So I will boot a domain xenU with a small ramdisk which will be it's
>> root, and then I want to migrate this domain from one vmware to the
>> other.
>>
>> In the documentation of xen I could not find any mention of this
>> scenario. Is it supposed to work ?
>> I mean, we have everything we need in the memory of the xenU domain, so
>> I suspect is should work.
> 
> Yes, this should work.  In fact, I've been planning on updating the docs
> to use this as a simple migration example.

Hey, it actually worked. I just had to use Xen 2.0.4 instead of the one
found on XenCD 1.0 RC1.
And it did migrated like a charm. Also xm save/restore worked just fine.
All in vmware.
You definitely should modify the docs, this is the easiest way to test
migration.

Thanks,
Paul




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Re: migration question

[Roland]

Hi Paul, 

>Paul Ionescu <i_p_a_u_l <at> yahoo.com> writes:
> I don't want to have external iscsi or nfs or other 
> types of NAS butinstead use a small ramdisk.
> So I will boot a domain xenU with a small ramdisk 
> which will be it's root,and then I want to migrate 
> this domain from one vmware to the other.

Sorry - I can`t follow here exactly. Could you perhaps 
describe in more detail what you did (especially with the 
ramdisk) ? Did you use that as SharedStorage?

BTW: 
If SharedStorage with VMWare (which icsci or special types 
of NFS are) is an issue (it was till Version 4.x) - there 
is a recent thread on VMWare mailinglist about SharedStorage 
with VMWare Workstation (using a virtual SCSI HDD from within 
two nodes at the same time). Now it seems to works again (via
undocumented param diskLib.dataCacheMaxSize = "0").

Unfortunately it`s the Vmware 5 beta board and it`s currently 
closed to the public - you need an account:

http://www.vmware.com/community/thread.jspa?threadID=10731&tstart=30

There is a similar public thread at:
http://www.vmware.com/community/thread.jspa?forumID=19&threadID=11257 \ 
&messageID=109257#109257

regards
Roland




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