[pve-devel] [PATCH v4 qemu-server 0/2] remote-migration: migration with different cpu
Alexandre Derumier
aderumier at odiso.com
Thu Sep 28 16:45:54 CEST 2023
This patch series allow remote migration between cluster with different cpu model.
2 new params are introduced: "target-cpu" && "target-reboot"
If target-cpu is defined, this will replace the cpu model of the target vm.
If vm is online/running, an extra "target-reboot" safeguard option is needed.
Indeed, as the target cpu is different, the live migration with memory transfert
is skipped (as anyway, the target will die with a different cpu).
Then, after the storage copy, we switch source vm disk to the targetvm nbd export,
then shutdown the source vm and restart the target vm.
(Like a virtual reboot between source/target)
Changelog v2:
The first version was simply shuting down the target vm,
wihout doing the block-job-complete.
After doing production migration with around 400vms, I had
some fs corruption, like some datas was still in buffer.
This v2 has been tested with another 400vms batch, without
any corruption.
Changelog v3:
v2 was not perfect, still have some 1 or 2 fs corruption with vms doing
a lot of write.
This v3 retake idea of the v1 but in a cleaner way
- we migrate disk to target vm
- source vm is switching disk to the nbd of the target vm.
(with a block-job-complete, and not a block-job-cancel with standard disk migration).
We are 100% sure it that no pending write is still pending in the migration job.
- source vm is shutdown
- target with is restart
Changelog v4:
- bugfix: no not override cpu with empty config if targetcpu is not defined
- small cleanups with params
We have redone a lot of migration this summer( maybe another 4000vm),
0 corruption, windows or linux guest vms.
Alexandre Derumier (2):
migration: move livemigration code in a dedicated sub
remote-migration: add target-cpu && target-reboot params
PVE/API2/Qemu.pm | 23 ++-
PVE/CLI/qm.pm | 11 ++
PVE/QemuMigrate.pm | 451 ++++++++++++++++++++++++---------------------
3 files changed, 276 insertions(+), 209 deletions(-)
--
2.39.2
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