TL;DR: on Windows guests, the guest agent calls into the VSS (Volume Shadow Copy) subsystem, which has potential to mess up applications which hook into this themselves like SQL server, as described in the bug report [0].
Building upon the proposal in that report, add an (default-enabled) option to the QGA configuration to disable the behavior if really needed. Due to its potential to wreak havor, show the user a warning when disabled. [0] https://bugzilla.proxmox.com/show_bug.cgi?id=4140 Christoph Heiss (1): vzdump: Add VM QGA option to skip `fs-freeze`/`fs-thaw` on backup PVE/QemuServer.pm | 8 +++++++- PVE/VZDump/QemuServer.pm | 5 +++++ 2 files changed, 12 insertions(+), 1 deletion(-) Christoph Heiss (1): ui: qga: Add option to turn off fs-freeze/thaw for backup www/manager6/Utils.js | 2 ++ www/manager6/form/AgentFeatureSelector.js | 30 +++++++++++++++++++++++++++++- 2 files changed, 31 insertions(+), 1 deletion(-) Christoph Heiss (1): qm: Add section explaining fs-freeze/thaw QGA option qm.adoc | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) -- 2.39.1 _______________________________________________ pve-devel mailing list pve-devel@lists.proxmox.com https://lists.proxmox.com/cgi-bin/mailman/listinfo/pve-devel
