[pve-devel] Fw: Storage migration

[Alexandre DERUMIER]

>>I have read the qemu plans 
><(http://wiki.qemu.org/Features/LiveBlockMigration) which seems to me 
>>they are taking an approach centered around a VM meaning they will 
>>perform migration where the entire VM is moved accordingly.

Not sure, I think we can only migrate the storage without migrate the vm. (maybe we can do both at the same time)
I know it's works with file, not sure it's work with all blocks storages.

drive-mirror qmp infos:

"
SQMP
drive-mirror
------------

Start mirroring a block device's writes to a new destination. target
specifies the target of the new image. If the file exists, or if it is
a device, it will be used as the new destination for writes. If it does not
exist, a new file will be created. format specifies the format of the
mirror image, default is to probe if mode='existing', else the format
of the source.

Arguments:

- "device": device name to operate on (json-string)
- "target": name of new image file (json-string)
- "format": format of new image (json-string, optional)
- "mode": how an image file should be created into the target
  file/device (NewImageMode, optional, default 'absolute-paths')
- "speed": maximum speed of the streaming job, in bytes per second
  (json-int)
- "sync": what parts of the disk image should be copied to the destination;
  possibilities include "full" for all the disk, "top" for only the sectors
  allocated in the topmost image, or "none" to only replicate new I/O
  (MirrorSyncMode).
- "on-source-error": the action to take on an error on the source
  (BlockdevOnError, default 'report')
- "on-target-error": the action to take on an error on the target
  (BlockdevOnError, default 'report')



Example:

-> { "execute": "drive-mirror", "arguments": { "device": "ide-hd0",
                                               "target": "/some/place/my-image",
                                               "sync": "full",
                                               "format": "qcow2" } }
<- { "return": {} }
"

>>The name will 
>>obviously be 'migrate' or 'move'. When the user presses the button an 
>>overlay menu should open showing the following: 

>>Disk: The name 
>>Target: A drop-down list displaying available shared storage 

>>I will not show a checkbox for choosing online since this will be 
>>implicit - connected to a running instance means online, offline 
>>otherwise. 

>>Next part will be to move the disk to the new location and change 
>>vmid.config accordantly. 

>>Finish by refreshing the GUI with the new information. 

Yes, Good Idea.
offline can be easily done with "qemu-img convert", it's works will all storages

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

De: "Michael Rasmussen" <mir at datanom.net> 
À: pve-devel at pve.proxmox.com 
Envoyé: Samedi 17 Novembre 2012 20:14:04 
Objet: Re: [pve-devel] Fw: Storage migration 

On Sat, 17 Nov 2012 19:41:45 +0100 
Stefan Priebe <s.priebe at profihost.ag> wrote: 

> 
> Wouldn't it be useful to be able to move disks from VM X to VM Y. I don't like that disks are fixed to vms. 
> 
Exactly my point of view. 

I have read the qemu plans 
(http://wiki.qemu.org/Features/LiveBlockMigration) which seems to me 
they are taking an approach centered around a VM meaning they will 
perform migration where the entire VM is moved accordingly. I was 
thinking more about added a extra button under the hardware tab which 
will be available when a harddisk is having focus. The name will 
obviously be 'migrate' or 'move'. When the user presses the button an 
overlay menu should open showing the following: 

Disk: The name 
Target: A drop-down list displaying available shared storage 

I will not show a checkbox for choosing online since this will be 
implicit - connected to a running instance means online, offline 
otherwise. 

Next part will be to move the disk to the new location and change 
vmid.config accordantly. 

Finish by refreshing the GUI with the new information. 

-- 
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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