diff --git a/collectors/beegfsmetaMetric.go b/collectors/beegfsmetaMetric.go
index 57b1e39..a27faf2 100644
--- a/collectors/beegfsmetaMetric.go
+++ b/collectors/beegfsmetaMetric.go
@@ -55,6 +55,7 @@ func (m *BeegfsMetaCollector) Init(config json.RawMessage) error {
 
 	m.name = "BeegfsMetaCollector"
 	m.setup()
+	m.parallel = true
 	// Set default beegfs-ctl binary
 
 	m.config.Beegfs = DEFAULT_BEEGFS_CMD
diff --git a/collectors/beegfsstorageMetric.go b/collectors/beegfsstorageMetric.go
index cbc8314..1160664 100644
--- a/collectors/beegfsstorageMetric.go
+++ b/collectors/beegfsstorageMetric.go
@@ -48,6 +48,7 @@ func (m *BeegfsStorageCollector) Init(config json.RawMessage) error {
 
 	m.name = "BeegfsStorageCollector"
 	m.setup()
+	m.parallel = true
 	// Set default beegfs-ctl binary
 
 	m.config.Beegfs = DEFAULT_BEEGFS_CMD
diff --git a/collectors/cpufreqCpuinfoMetric.go b/collectors/cpufreqCpuinfoMetric.go
index 6c3de7a..cdfa437 100644
--- a/collectors/cpufreqCpuinfoMetric.go
+++ b/collectors/cpufreqCpuinfoMetric.go
@@ -48,6 +48,7 @@ func (m *CPUFreqCpuInfoCollector) Init(config json.RawMessage) error {
 	m.setup()
 
 	m.name = "CPUFreqCpuInfoCollector"
+	m.parallel = true
 	m.meta = map[string]string{
 		"source": m.name,
 		"group":  "CPU",
diff --git a/collectors/cpufreqMetric.go b/collectors/cpufreqMetric.go
index 0bf6d4c..63eca26 100644
--- a/collectors/cpufreqMetric.go
+++ b/collectors/cpufreqMetric.go
@@ -53,6 +53,7 @@ func (m *CPUFreqCollector) Init(config json.RawMessage) error {
 
 	m.name = "CPUFreqCollector"
 	m.setup()
+	m.parallel = true
 	if len(config) > 0 {
 		err := json.Unmarshal(config, &m.config)
 		if err != nil {
diff --git a/collectors/cpustatMetric.go b/collectors/cpustatMetric.go
index 556aad4..ac8515d 100644
--- a/collectors/cpustatMetric.go
+++ b/collectors/cpustatMetric.go
@@ -30,6 +30,7 @@ type CpustatCollector struct {
 func (m *CpustatCollector) Init(config json.RawMessage) error {
 	m.name = "CpustatCollector"
 	m.setup()
+	m.parallel = true
 	m.meta = map[string]string{"source": m.name, "group": "CPU", "unit": "Percent"}
 	m.nodetags = map[string]string{"type": "node"}
 	if len(config) > 0 {
diff --git a/collectors/customCmdMetric.go b/collectors/customCmdMetric.go
index ec2109b..492dd48 100644
--- a/collectors/customCmdMetric.go
+++ b/collectors/customCmdMetric.go
@@ -33,6 +33,7 @@ type CustomCmdCollector struct {
 func (m *CustomCmdCollector) Init(config json.RawMessage) error {
 	var err error
 	m.name = "CustomCmdCollector"
+	m.parallel = true
 	m.meta = map[string]string{"source": m.name, "group": "Custom"}
 	if len(config) > 0 {
 		err = json.Unmarshal(config, &m.config)
diff --git a/collectors/diskstatMetric.go b/collectors/diskstatMetric.go
index 4910c83..69ffe07 100644
--- a/collectors/diskstatMetric.go
+++ b/collectors/diskstatMetric.go
@@ -29,6 +29,7 @@ type DiskstatCollector struct {
 
 func (m *DiskstatCollector) Init(config json.RawMessage) error {
 	m.name = "DiskstatCollector"
+	m.parallel = true
 	m.meta = map[string]string{"source": m.name, "group": "Disk"}
 	m.setup()
 	if len(config) > 0 {
@@ -77,11 +78,18 @@ func (m *DiskstatCollector) Read(interval time.Duration, output chan lp.CCMetric
 			continue
 		}
 		path := strings.Replace(linefields[1], `\040`, " ", -1)
-		stat := syscall.Statfs_t{}
+		stat := syscall.Statfs_t{
+			Blocks: 0,
+			Bsize:  0,
+			Bfree:  0,
+		}
 		err := syscall.Statfs(path, &stat)
 		if err != nil {
 			continue
 		}
+		if stat.Blocks == 0 || stat.Bsize == 0 {
+			continue
+		}
 		tags := map[string]string{"type": "node", "device": linefields[0]}
 		total := (stat.Blocks * uint64(stat.Bsize)) / uint64(1000000000)
 		y, err := lp.New("disk_total", tags, m.meta, map[string]interface{}{"value": total}, time.Now())
@@ -95,9 +103,11 @@ func (m *DiskstatCollector) Read(interval time.Duration, output chan lp.CCMetric
 			y.AddMeta("unit", "GBytes")
 			output <- y
 		}
-		perc := (100 * (total - free)) / total
-		if perc > part_max_used {
-			part_max_used = perc
+		if total > 0 {
+			perc := (100 * (total - free)) / total
+			if perc > part_max_used {
+				part_max_used = perc
+			}
 		}
 	}
 	y, err := lp.New("part_max_used", map[string]string{"type": "node"}, m.meta, map[string]interface{}{"value": int(part_max_used)}, time.Now())
diff --git a/collectors/gpfsMetric.go b/collectors/gpfsMetric.go
index ed63201..ca9affe 100644
--- a/collectors/gpfsMetric.go
+++ b/collectors/gpfsMetric.go
@@ -46,6 +46,7 @@ func (m *GpfsCollector) Init(config json.RawMessage) error {
 	var err error
 	m.name = "GpfsCollector"
 	m.setup()
+	m.parallel = true
 
 	// Set default mmpmon binary
 	m.config.Mmpmon = DEFAULT_GPFS_CMD
diff --git a/collectors/infinibandMetric.go b/collectors/infinibandMetric.go
index 274e669..92ea911 100644
--- a/collectors/infinibandMetric.go
+++ b/collectors/infinibandMetric.go
@@ -54,6 +54,7 @@ func (m *InfinibandCollector) Init(config json.RawMessage) error {
 	var err error
 	m.name = "InfinibandCollector"
 	m.setup()
+	m.parallel = true
 	m.meta = map[string]string{
 		"source": m.name,
 		"group":  "Network",
diff --git a/collectors/iostatMetric.go b/collectors/iostatMetric.go
index ca7f33c..19b4157 100644
--- a/collectors/iostatMetric.go
+++ b/collectors/iostatMetric.go
@@ -37,6 +37,7 @@ type IOstatCollector struct {
 func (m *IOstatCollector) Init(config json.RawMessage) error {
 	var err error
 	m.name = "IOstatCollector"
+	m.parallel = true
 	m.meta = map[string]string{"source": m.name, "group": "Disk"}
 	m.setup()
 	if len(config) > 0 {
diff --git a/collectors/ipmiMetric.go b/collectors/ipmiMetric.go
index 16b08ef..50605ac 100644
--- a/collectors/ipmiMetric.go
+++ b/collectors/ipmiMetric.go
@@ -34,6 +34,7 @@ type IpmiCollector struct {
 func (m *IpmiCollector) Init(config json.RawMessage) error {
 	m.name = "IpmiCollector"
 	m.setup()
+	m.parallel = true
 	m.meta = map[string]string{"source": m.name, "group": "IPMI"}
 	m.config.IpmitoolPath = string(IPMITOOL_PATH)
 	m.config.IpmisensorsPath = string(IPMISENSORS_PATH)
diff --git a/collectors/likwidMetric.go b/collectors/likwidMetric.go
index f2229d1..ae44392 100644
--- a/collectors/likwidMetric.go
+++ b/collectors/likwidMetric.go
@@ -177,6 +177,7 @@ func getBaseFreq() float64 {
 
 func (m *LikwidCollector) Init(config json.RawMessage) error {
 	m.name = "LikwidCollector"
+	m.parallel = false
 	m.initialized = false
 	m.running = false
 	m.config.AccessMode = LIKWID_DEF_ACCESSMODE
diff --git a/collectors/loadavgMetric.go b/collectors/loadavgMetric.go
index 3859721..58fb102 100644
--- a/collectors/loadavgMetric.go
+++ b/collectors/loadavgMetric.go
@@ -36,6 +36,7 @@ type LoadavgCollector struct {
 
 func (m *LoadavgCollector) Init(config json.RawMessage) error {
 	m.name = "LoadavgCollector"
+	m.parallel = true
 	m.setup()
 	if len(config) > 0 {
 		err := json.Unmarshal(config, &m.config)
diff --git a/collectors/lustreMetric.go b/collectors/lustreMetric.go
index d5a96e4..eade2ca 100644
--- a/collectors/lustreMetric.go
+++ b/collectors/lustreMetric.go
@@ -288,6 +288,7 @@ var LustreDeriveMetrics = []LustreMetricDefinition{
 func (m *LustreCollector) Init(config json.RawMessage) error {
 	var err error
 	m.name = "LustreCollector"
+	m.parallel = true
 	if len(config) > 0 {
 		err = json.Unmarshal(config, &m.config)
 		if err != nil {
diff --git a/collectors/memstatMetric.go b/collectors/memstatMetric.go
index c6c7f34..fb27d89 100644
--- a/collectors/memstatMetric.go
+++ b/collectors/memstatMetric.go
@@ -81,6 +81,7 @@ func getStats(filename string) map[string]MemstatStats {
 func (m *MemstatCollector) Init(config json.RawMessage) error {
 	var err error
 	m.name = "MemstatCollector"
+	m.parallel = true
 	m.config.NodeStats = true
 	m.config.NumaStats = false
 	if len(config) > 0 {
@@ -159,8 +160,10 @@ func (m *MemstatCollector) Init(config json.RawMessage) error {
 
 func (m *MemstatCollector) Read(interval time.Duration, output chan lp.CCMetric) {
 	if !m.init {
+		cclog.ComponentPrint(m.name, "Here")
 		return
 	}
+	cclog.ComponentPrint(m.name, time.Now())
 
 	sendStats := func(stats map[string]MemstatStats, tags map[string]string) {
 		for match, name := range m.matches {
diff --git a/collectors/metricCollector.go b/collectors/metricCollector.go
index 7c04e90..13f8f2a 100644
--- a/collectors/metricCollector.go
+++ b/collectors/metricCollector.go
@@ -13,17 +13,19 @@ import (
 )
 
 type MetricCollector interface {
-	Name() string                                         // Name of the metric collector
-	Init(config json.RawMessage) error                    // Initialize metric collector
-	Initialized() bool                                    // Is metric collector initialized?
+	Name() string                      // Name of the metric collector
+	Init(config json.RawMessage) error // Initialize metric collector
+	Initialized() bool                 // Is metric collector initialized?
+	Parallel() bool
 	Read(duration time.Duration, output chan lp.CCMetric) // Read metrics from metric collector
 	Close()                                               // Close / finish metric collector
 }
 
 type metricCollector struct {
-	name string            // name of the metric
-	init bool              // is metric collector initialized?
-	meta map[string]string // static meta data tags
+	name     string            // name of the metric
+	init     bool              // is metric collector initialized?
+	parallel bool              // can the metric collector be executed in parallel with others
+	meta     map[string]string // static meta data tags
 }
 
 // Name returns the name of the metric collector
@@ -31,6 +33,11 @@ func (c *metricCollector) Name() string {
 	return c.name
 }
 
+// Name returns the name of the metric collector
+func (c *metricCollector) Parallel() bool {
+	return c.parallel
+}
+
 // Setup is for future use
 func (c *metricCollector) setup() error {
 	return nil
diff --git a/collectors/netstatMetric.go b/collectors/netstatMetric.go
index d171d4b..8cfb34e 100644
--- a/collectors/netstatMetric.go
+++ b/collectors/netstatMetric.go
@@ -39,6 +39,7 @@ type NetstatCollector struct {
 
 func (m *NetstatCollector) Init(config json.RawMessage) error {
 	m.name = "NetstatCollector"
+	m.parallel = true
 	m.setup()
 	m.lastTimestamp = time.Now()
 
diff --git a/collectors/nfsMetric.go b/collectors/nfsMetric.go
index c511b0d..6b15784 100644
--- a/collectors/nfsMetric.go
+++ b/collectors/nfsMetric.go
@@ -114,6 +114,7 @@ func (m *nfsCollector) MainInit(config json.RawMessage) error {
 	m.data = make(map[string]NfsCollectorData)
 	m.initStats()
 	m.init = true
+	m.parallel = true
 	return nil
 }
 
diff --git a/collectors/numastatsMetric.go b/collectors/numastatsMetric.go
index 52a2638..f65a019 100644
--- a/collectors/numastatsMetric.go
+++ b/collectors/numastatsMetric.go
@@ -54,6 +54,7 @@ func (m *NUMAStatsCollector) Init(config json.RawMessage) error {
 	}
 
 	m.name = "NUMAStatsCollector"
+	m.parallel = true
 	m.setup()
 	m.meta = map[string]string{
 		"source": m.name,
diff --git a/collectors/sampleMetric.go b/collectors/sampleMetric.go
index 47078a6..09a6b3c 100644
--- a/collectors/sampleMetric.go
+++ b/collectors/sampleMetric.go
@@ -35,6 +35,10 @@ func (m *SampleCollector) Init(config json.RawMessage) error {
 	m.name = "InternalCollector"
 	// This is for later use, also call it early
 	m.setup()
+	// Tell whether the collector should be run in parallel with others (reading files, ...)
+	// or it should be run serially, mostly for collectors acutally doing measurements
+	// because they should not measure the execution of the other collectors
+	m.parallel = true
 	// Define meta information sent with each metric
 	// (Can also be dynamic or this is the basic set with extension through AddMeta())
 	m.meta = map[string]string{"source": m.name, "group": "SAMPLE"}
diff --git a/collectors/tempMetric.go b/collectors/tempMetric.go
index 7ba8eb1..af9d7fd 100644
--- a/collectors/tempMetric.go
+++ b/collectors/tempMetric.go
@@ -50,6 +50,7 @@ func (m *TempCollector) Init(config json.RawMessage) error {
 	}
 
 	m.name = "TempCollector"
+	m.parallel = true
 	m.setup()
 	if len(config) > 0 {
 		err := json.Unmarshal(config, &m.config)
@@ -116,6 +117,10 @@ func (m *TempCollector) Init(config json.RawMessage) error {
 		}
 
 		// Sensor file
+		_, err = ioutil.ReadFile(file)
+		if err != nil {
+			continue
+		}
 		sensor.file = file
 
 		// Sensor tags
diff --git a/collectors/topprocsMetric.go b/collectors/topprocsMetric.go
index 408c3cc..1f4aaca 100644
--- a/collectors/topprocsMetric.go
+++ b/collectors/topprocsMetric.go
@@ -28,6 +28,7 @@ type TopProcsCollector struct {
 func (m *TopProcsCollector) Init(config json.RawMessage) error {
 	var err error
 	m.name = "TopProcsCollector"
+	m.parallel = true
 	m.tags = map[string]string{"type": "node"}
 	m.meta = map[string]string{"source": m.name, "group": "TopProcs"}
 	if len(config) > 0 {