[pve-devel] Fw: Storage migration

[Alexandre DERUMIER]

>>Can someone explain me why I want live block migrations? 
I can see some good usages:

You have an overload san because the workload of a guest change, so you want to put it on another storage.
(And you can't do it offline because it's a database or other critical app)

You have an old san hardware and you want to move to a newer san, without shutting down guest.


>>I can see that it is sometimes necessary to move a disk from one store to another, 
>>but doing this while the VM is online seem to be a big waste of resources. 
>>If there is some load on the VM, you will get very poor results. 

If your target storage is as fast than the older, it shouldn't be a problem. 
(I don't have read yet the block mirror qmp code, but I think it's just writing to both storages and wait for the write ack from both storages)


>>And normally I want to move a single disk, not all? 
I agree with that,we need to have the possibility to move a single disk and not all. 




I'm already doing this with my netapp pnfs cluster,
on the netapp side, migrate volume between differents array, (with internal 10gbe cluster), and it's works fine without any slowdown.




----- Mail original ----- 

De: "Dietmar Maurer" <dietmar at proxmox.com> 
À: "Michael Rasmussen" <mir at datanom.net>, pve-devel at pve.proxmox.com 
Envoyé: Dimanche 18 Novembre 2012 15:55:44 
Objet: Re: [pve-devel] Fw: Storage migration 

Can someone explain me why I want live block migrations? 

I can see that it is sometimes necessary to move a disk from one store to another, 
but doing this while the VM is online seem to be a big waste of resources. 
If there is some load on the VM, you will get very poor results. 

And normally I want to move a single disk, not all? 


> -----Original Message----- 
> From: pve-devel-bounces at pve.proxmox.com [mailto:pve-devel- 
> bounces at pve.proxmox.com] On Behalf Of Michael Rasmussen 
> Sent: Sonntag, 18. November 2012 13:02 
> To: pve-devel at pve.proxmox.com 
> Subject: Re: [pve-devel] Fw: Storage migration 
> 
> On Sun, 18 Nov 2012 12:26:33 +0100 
> Michael Rasmussen <mir at datanom.net> wrote: 
> 
> > I think it should be possible using the snapshot feature in 
> > combination with NBD. I will investigate further. 
> > 
> Thinking some more. I don't think using NBD will be a requirement since for 
> both iSCSI and NFS the other nodes storage will be accessable through the 
> file system. 
> 
> -- 
> Hilsen/Regards 
> Michael Rasmussen 
> 
> Get my public GnuPG keys: 
> michael <at> rasmussen <dot> cc 
> http://pgp.mit.edu:11371/pks/lookup?op=get&search=0xD3C9A00E 
> mir <at> datanom <dot> net 
> http://pgp.mit.edu:11371/pks/lookup?op=get&search=0xE501F51C 
> mir <at> miras <dot> org 
> http://pgp.mit.edu:11371/pks/lookup?op=get&search=0xE3E80917 
> -------------------------------------------------------------- 

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