QCOW2 images for VMs should be created with subclusters enabled #PSBM…

…-131094 L2 subcluster is an extension for qcow2 format: - it saves on disk space if the subcluster will contain hole - it improves backup speed
OpenVZ · Jul 15, 2021 · ba14b5b · ba14b5b
1 parent 8165198
commit ba14b5b
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Showing 2 changed files with 2 additions and 2 deletions.
diff --git a/Dispatcher/Dispatcher/Tasks/Task_MigrateVmTarget.cpp b/Dispatcher/Dispatcher/Tasks/Task_MigrateVmTarget.cpp
@@ -966,7 +966,7 @@ void Frontend::create(const CVmHardDisk& event_)
 	}
 	QStringList a;
 	a << "create" << "-f" << "qcow2";
-	a << "-o" << "cluster_size=1M,lazy_refcounts=on";
+	a << "-o" << "cluster_size=1M,lazy_refcounts=on,extended_l2=on";
 	a << event_.getSystemName();
 	a << QString::number(event_.getSize()).append("M");
 

diff --git a/Dispatcher/Dispatcher/Tasks/Task_RestoreVmBackupTarget.cpp b/Dispatcher/Dispatcher/Tasks/Task_RestoreVmBackupTarget.cpp
@@ -495,7 +495,7 @@ PRL_RESULT Assistant::operator()(const QString& image_, const QString& archive_,
 	QStringList cmdline = QStringList() << QEMU_IMG << "convert" << "-O" << format_
 			<< "-S" << "64k" << "-t" << "none";
 	if (format_ == "qcow2")
-		cmdline << "-f" << "raw" << "-o" << "cluster_size=1M,lazy_refcounts=on"; 
+		cmdline << "-f" << "raw" << "-o" << "cluster_size=1M,lazy_refcounts=on,extended_l2=on"; 
 	cmdline << e.value() << image_;
 
 	Program::result_type q = Program::execute(cmdline, *m_task);