[pve-devel] Storage migration: online design solution

[Alexandre DERUMIER]

one other question:

I'm reading the qmp doc

# @drive-mirror
#
# Start mirroring a block device's writes to a new destination.
#
# @device:  the name of the device whose writes should be mirrored.
#
# @target: the target of the new image. If the file exists, or if it
#          is a device, the existing file/device will be used as the new
#          destination.  If it does not exist, a new file will be created.
#
# @format: #optional the format of the new destination, default is the
#          format of the source

target can be file or device, (So I think it's for migrate between 2 storages available on same host)


So, if you use ndb server as target, is it for migrate storage between 2 differents host ? (From 1 local storage on 1 host to another local storage on different host by example)
If yes, I think we need to migrate also the vm on the new host ?




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

De: "Michael Rasmussen" <mir at datanom.net> 
À: pve-devel at pve.proxmox.com 
Envoyé: Mercredi 9 Janvier 2013 02:23:11 
Objet: [pve-devel] Storage migration: online design solution 

Hi all, 

Doing online storage migration will involve the following phases: 
Phase 1) Create remote block device 
Phase 2) Connect this block device to NBD (nbd_server_add [-w] device) 
Phase 3) Start nbd_server (nbd_server_start [-a] [-w] host:port) 
Phase 4) "drive-mirror", "arguments": {"device": "ide-hd0", 
"target": "nbd:host:port", 
"sync": "full", 
"format": "(qcow2|raw)" } 
Phase 5) "drive-reopen", "data": {"device": "ide-hd0", 
"new-image-file": "new block device", 
"format": "(qcow2|raw)"} 
Phase 6) Stop nbd_server (nbd_server_stop) 
Phase 7) Remove old block device 

Have I missed something? 

PS. I am struggling with this '"device": "ide-hd0"'. What is the 
correct way of specifying a block device in proxmox given the following 
configuration: virtio2: pve-storage1_lvm:vm-102-disk-1,size=2G 

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