[pve-devel] [PATCH v2 series 0/5] disk reassign: add new feature

Aaron Lauterer a.lauterer at proxmox.com
Tue Sep 1 14:44:16 CEST 2020


This RFC series implements a new feature which allows users to easily
reassign disks between VMs. Currently this is only possible with one of
the following manual steps:

* rename the disk image/file and do a `qm rescan`
* configure the disk manually and use the old image name, having an
    image for VM A assigned to VM B

The latter can cause unexpected behavior because PVE expects that the
VMID in a disk name always corresponds to the VM it is assigned to. Thus
when a disk, original from VM A was manually configured as disk for VM B
it happens that, when deleting VM A, the disk in question will be
deleted as well because it still had the VMID of VM A in it's name.

To issue a reassign from the CLI run:

qm reassign_disk <source VMID> <target VMID> <disk key>

where <disk key> is the config key of the disk, e.g. ide0, scsi1 and so
on.

The following storage types are implemented at the moment:
* dir based ones
    * directory
    * NFS
    * CIFS
* ZFS
* (thin) LVM
* Ceph RBD

Changes from RFC -> V1:
* support to reassign unused disks
* digest for target vm config
* reorder the checks a bit
* adding another one to check if the given key for the disk even exists
  in the config.

v1 -> v2:
print info about the new disk volid and key at the end of the job so it
shows up in the CLI output and task log


qemu-server: Aaron Lauterer (2):
  disk reassign: add API endpoint
  cli: disk reassign: add reassign_disk to qm command

 PVE/API2/Qemu.pm        | 108 ++++++++++++++++++++++++++++++++++++++++
 PVE/CLI/qm.pm           |   2 +
 PVE/QemuServer/Drive.pm |   4 ++
 3 files changed, 114 insertions(+)


storage: Aaron Lauterer (2):
  add disk reassign feature
  disk reassign: add not implemented yet message to storages

 PVE/Storage.pm                   | 10 ++++++++++
 PVE/Storage/CephFSPlugin.pm      |  5 +++++
 PVE/Storage/DRBDPlugin.pm        |  5 +++++
 PVE/Storage/GlusterfsPlugin.pm   |  5 +++++
 PVE/Storage/ISCSIDirectPlugin.pm |  5 +++++
 PVE/Storage/ISCSIPlugin.pm       |  4 ++++
 PVE/Storage/LVMPlugin.pm         | 15 +++++++++++++++
 PVE/Storage/Plugin.pm            | 21 +++++++++++++++++++++
 PVE/Storage/RBDPlugin.pm         | 13 +++++++++++++
 PVE/Storage/ZFSPlugin.pm         |  5 +++++
 PVE/Storage/ZFSPoolPlugin.pm     |  9 +++++++++
 11 files changed, 97 insertions(+)


widget-toolkit: Aaron Lauterer (1):
  utils: task_desc_table: add qmreassign

 src/Utils.js | 1 +
 1 file changed, 1 insertion(+)

-- 
2.20.1





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