diff --git a/pkg/hostman/guestman/qemu-kvmhelper.go b/pkg/hostman/guestman/qemu-kvmhelper.go
index 392a7d6ad2..1c2d43031f 100644
--- a/pkg/hostman/guestman/qemu-kvmhelper.go
+++ b/pkg/hostman/guestman/qemu-kvmhelper.go
@@ -468,10 +468,10 @@ func (s *SKVMGuestInstance) _generateStartScript(data *jsonutils.JSONDict) (stri
 	cmd += fmt.Sprintf(" -machine %s,accel=%s", s.getMachine(), accel)
 	cmd += " -k en-us"
 	// #cmd += " -g 800x600"
-	cmd += fmt.Sprintf(" -smp %d,maxcpus=128", cpu)
+	cmd += fmt.Sprintf(" -smp %d,maxcpus=255", cpu)
 	cmd += fmt.Sprintf(" -name %s", name)
 	// #cmd += fmt.Sprintf(" -uuid %s", self.desc["uuid"])
-	cmd += fmt.Sprintf(" -m %dM,slots=4,maxmem=262144M", mem)
+	cmd += fmt.Sprintf(" -m %dM,slots=4,maxmem=524288M", mem)
 
 	if s.manager.host.IsHugepagesEnabled() {
 		cmd += fmt.Sprintf(" -mem-prealloc -mem-path %s", fmt.Sprintf("/dev/hugepages/%s", uuid))
diff --git a/pkg/hostman/hostinfo/hostinfo.go b/pkg/hostman/hostinfo/hostinfo.go
index a45ad4b11b..3cf0614d7c 100644
--- a/pkg/hostman/hostinfo/hostinfo.go
+++ b/pkg/hostman/hostinfo/hostinfo.go
@@ -1108,8 +1108,10 @@ func (h *SHostInfo) PutHostOffline() {
 }
 
 func (h *SHostInfo) PutHostOnline() error {
-	if len(h.SysError) > 0 {
+	if len(h.SysError) > 0 && !options.HostOptions.StartHostIgnoreSysError {
 		log.Fatalf("Can't put host online, unless resolve these problem %v", h.SysError)
+	} else if len(h.SysError) > 0 && options.HostOptions.StartHostIgnoreSysError {
+		log.Errorf("Host sys error: %v", h.SysError)
 	}
 
 	if len(h.SysWarning) > 0 {
diff --git a/pkg/hostman/options/options.go b/pkg/hostman/options/options.go
index 86195a57dd..ff4bc9a765 100644
--- a/pkg/hostman/options/options.go
+++ b/pkg/hostman/options/options.go
@@ -134,7 +134,8 @@ type SHostOptions struct {
 	HostHealthTimeout   int    `help:"host health timeout" default:"30"`
 	HostLeaseTimeout    int    `help:"lease timeout" default:"10"`
 
-	SyncStorageInfoDurationSecond int `help:"sync storage size duration, unit is second" default:"60"`
+	SyncStorageInfoDurationSecond int  `help:"sync storage size duration, unit is second" default:"60"`
+	StartHostIgnoreSysError       bool `help:"start host agent ignore sys error" default:"false"`
 }
 
 var (