diff --git a/qm.adoc b/qm.adoc index 4bb8f2c..40caaa3 100644 --- a/qm.adoc +++ b/qm.adoc @@ -1355,14 +1355,19 @@ that calling 'fs-freeze' with some SQL Servers triggers VSS to call the SQL Writer VSS module in a mode that breaks the SQL Server backup chain for differential backups. -For such setups you can configure {pve} to not issue a freeze-and-thaw cycle on +There are two options on how to handle such a situation. + +1. Configure the QEMU Guest Agent to use a different VSS variant that does not +interfere with other VSS users. The https://pve.proxmox.com/wiki/VM_Backup_Consistency[{pve} wiki] +has more details. +2. Alternatively, you can configure {pve} to not issue a freeze-and-thaw cycle on backup by setting the `freeze-fs-on-backup` QGA option to `0`. This can also be done via the GUI with the 'Freeze/thaw guest filesystems on backup for consistency' option. - -IMPORTANT: Disabling this option can potentially lead to backups with inconsistent -filesystems and should therefore only be disabled if you know what you are -doing. ++ +IMPORTANT: Disabling this option can potentially lead to backups with +inconsistent filesystems. Therefore, adapting the QEMU Guest Agent +configuration in the guest is the preferred option. Troubleshooting ^^^^^^^^^^^^^^^ diff --git a/vzdump.adoc b/vzdump.adoc index aecb353..d0c26d9 100644 --- a/vzdump.adoc +++ b/vzdump.adoc @@ -84,6 +84,10 @@ backup, in which data blocks are copied while the VM is running. If the guest agent is enabled (`agent: 1`) and running, it calls `guest-fsfreeze-freeze` and `guest-fsfreeze-thaw` to improve consistency. ++ +NOTE: On Windows guests it is necessary to configure the guest agent if another +backup software is used within the guest. See xref:qm_qga_fsfreeze[Freeze & Thaw] +in the guest agent section for more details. A technical overview of the {pve} live backup for QemuServer can be found online