mirror of
https://git.proxmox.com/git/qemu-server
synced 2025-06-03 06:28:07 +00:00
60e1b142fb
There is a possibility that the drive-mirror job is not yet done when the migration wants to inactivate the source's blockdrives: > bdrv_co_write_req_prepare: Assertion `!(bs->open_flags & BDRV_O_INACTIVE)' failed. This can be prevented by using the 'write-blocking' copy mode (also called active mode) for the mirror. However, with active mode, the guest write speed is limited by the synchronous writes to the mirror target. For this reason, a way to start out in the faster 'background' mode and later switch to active mode was introduced in QEMU 8.2. The switch is done once the mirror job for all drives is ready to be completed to reduce the time spent where guest IO is limited. The loop waiting for actively-synced to become true is not an endless loop: Once the remaining dirty parts have been mirrored by the background iteration, the actively-synced flag will be set. Because the 'block-job-change' QMP command already succeeded, new writes will be done synchronously to the target and thus not lead to new dirty parts. If the job fails or vanishes (shouldn't actually happen, because auto-dismiss is false), the loop will be exited and the error propagated. Reported rarely, but steadily over the years: https://forum.proxmox.com/threads/78954/post-353651 https://forum.proxmox.com/threads/78954/post-380015 https://forum.proxmox.com/threads/100020/post-431660 https://forum.proxmox.com/threads/111831/post-482425 https://forum.proxmox.com/threads/111831/post-499807 https://forum.proxmox.com/threads/137849/ Signed-off-by: Fiona Ebner <f.ebner@proxmox.com> |
||
|---|---|---|
| .. | ||
| QemuMigrateMock.pm | ||
| QmMock.pm | ||
| Shared.pm | ||