rrd stats: improve io delay stats

src/api2/admin/datastore.rs

@@ -875,8 +875,9 @@ fn get_rrd_stats(
         &rrd_dir,
         &[
             "total", "used",
-            "read_ios", "read_bytes", "read_ticks",
+            "read_ios", "read_bytes",
-            "write_ios", "write_bytes", "write_ticks",
+            "write_ios", "write_bytes",
+            "io_ticks",
         ],
         timeframe,
         cf,

src/api2/node/rrd.rs

@@ -36,8 +36,9 @@ fn get_node_stats(
             "netin", "netout",
             "loadavg",
             "total", "used",
-            "read_ios", "read_bytes", "read_ticks",
+            "read_ios", "read_bytes",
-            "write_ios", "write_bytes", "write_ticks",
+            "write_ios", "write_bytes",
+            "io_ticks",
          ],
         timeframe,
         cf,

src/bin/proxmox-backup-proxy.rs

@@ -741,15 +741,14 @@ fn gather_disk_stats(disk_manager: Arc<DiskManage>, path: &Path, rrd_prefix: &st
                     rrd_update_derive(&rrd_key, stat.read_ios as f64);
                     let rrd_key = format!("{}/read_bytes", rrd_prefix);
                     rrd_update_derive(&rrd_key, (stat.read_sectors*512) as f64);
-                    let rrd_key = format!("{}/read_ticks", rrd_prefix);
-                    rrd_update_derive(&rrd_key, (stat.read_ticks as f64)/1000.0);
 
                     let rrd_key = format!("{}/write_ios", rrd_prefix);
                     rrd_update_derive(&rrd_key, stat.write_ios as f64);
                     let rrd_key = format!("{}/write_bytes", rrd_prefix);
                     rrd_update_derive(&rrd_key, (stat.write_sectors*512) as f64);
-                    let rrd_key = format!("{}/write_ticks", rrd_prefix);
+
-                    rrd_update_derive(&rrd_key, (stat.write_ticks as f64)/1000.0);
+                    let rrd_key = format!("{}/io_ticks", rrd_prefix);
+                    rrd_update_derive(&rrd_key, (stat.io_ticks as f64)/1000.0);
                 }
             }
         }

src/tools/disks.rs

@@ -427,6 +427,8 @@ impl Disk {
     }
 
     /// Read block device stats
+    ///
+    /// see https://www.kernel.org/doc/Documentation/block/stat.txt
     pub fn read_stat(&self) -> std::io::Result<Option<BlockDevStat>> {
         if let Some(stat) = self.read_sys(Path::new("stat"))? {
             let stat = unsafe { std::str::from_utf8_unchecked(&stat) };
@@ -434,18 +436,15 @@ impl Disk {
                 u64::from_str_radix(s, 10).unwrap_or(0)
             }).collect();
 
-            if stat.len() < 8 { return Ok(None); }
+            if stat.len() < 15 { return Ok(None); }
 
             return Ok(Some(BlockDevStat {
                 read_ios: stat[0],
-                read_merges: stat[1],
                 read_sectors: stat[2],
-                read_ticks: stat[3],
+                write_ios: stat[4] + stat[11], // write + discard
-                write_ios: stat[4],
+                write_sectors: stat[6] + stat[13], // write + discard
-                write_merges: stat[5],
+                io_ticks: stat[10],
-                write_sectors: stat[6],
+             }));
-                write_ticks: stat[7],
-            }));
         }
         Ok(None)
     }
@@ -470,11 +469,8 @@ pub enum DiskType {
 /// Represents the contents of the /sys/block/<dev>/stat file.
 pub struct BlockDevStat {
     pub read_ios: u64,
-    pub read_merges: u64,
     pub read_sectors: u64,
-    pub read_ticks: u64, //milliseconds
     pub write_ios: u64,
-    pub write_merges: u64,
     pub write_sectors: u64,
-    pub write_ticks: u64, //milliseconds
+    pub io_ticks: u64, // milliseconds
 }

src/tools/disks/zfs.rs

@@ -37,10 +37,7 @@ pub fn zfs_pool_stats(pool: &OsStr) -> Result<Option<BlockDevStat>, Error> {
         write_sectors: stat[1]>>9,
         read_ios: stat[2],
         write_ios: stat[3],
-        read_merges: 0, // there is no such info
+        io_ticks: ticks,
-        write_merges: 0, // there is no such info
-        write_ticks: ticks,
-        read_ticks: ticks,
     };
 
     Ok(Some(stat))

www/DataStoreStatistic.js

@@ -5,24 +5,18 @@ Ext.define('pve-rrd-datastore', {
 	'total',
 	'read_ios',
 	'read_bytes',
-	'read_ticks',
 	'write_ios',
 	'write_bytes',
-	'write_ticks',
+        'io_ticks',
 	{
-	    name: 'read_delay', calculate: function(data) {
+	    name: 'io_delay', calculate: function(data) {
-		if (data.read_ios === undefined || data.read_ios === 0 || data.read_ticks == undefined) {
+		let ios = 0;
+		if (data.read_ios !== undefined) { ios += data.read_ios; }
+		if (data.write_ios !== undefined) { ios += data.write_ios; }
+		if (ios == 0 || data.io_ticks === undefined) {
 		    return undefined;
 		}
-		return (data.read_ticks*1000)/data.read_ios;
+		return (data.io_ticks*1000.0)/ios;
-	    }
-	},
-	{
-	    name: 'write_delay', calculate: function(data) {
-		if (data.write_ios === undefined || data.write_ios === 0 || data.write_ticks == undefined) {
-		    return undefined;
-		}
-		return (data.write_ticks*1000)/data.write_ios;
 	    }
 	},
 	{ type: 'date', dateFormat: 'timestamp', name: 'time' }
@@ -85,9 +79,9 @@ Ext.define('PBS.DataStoreStatistic', {
 		},
 		{
 		    xtype: 'proxmoxRRDChart',
-		    title: gettext('Delay (ms)'),
+		    title: gettext('IO Delay (ms)'),
-		    fields: ['read_delay','write_delay'],
+		    fields: ['io_delay'],
-		    fieldTitles: [gettext('Read'), gettext('Write')],
+		    fieldTitles: [gettext('IO Delay')],
 		    store: rrdstore
 		},
 	    ]

www/ServerStatus.js

@@ -21,8 +21,24 @@ Ext.define('pve-rrd-node', {
 	'memused',
 	'swaptotal',
 	'swapused',
-	'roottotal',
+	'total',
-	'rootused',
+	'used',
+	'read_ios',
+	'read_bytes',
+        'write_ios',
+	'write_bytes',
+        'io_ticks',
+	{
+	    name: 'io_delay', calculate: function(data) {
+		let ios = 0;
+		if (data.read_ios !== undefined) { ios += data.read_ios; }
+		if (data.write_ios !== undefined) { ios += data.write_ios; }
+		if (ios == 0 || data.io_ticks === undefined) {
+		    return undefined;
+		}
+		return (data.io_ticks*1000.0)/ios;
+	    }
+	},
 	'loadavg',
 	{ type: 'date', dateFormat: 'timestamp', name: 'time' }
     ]
@@ -146,8 +162,8 @@ Ext.define('PBS.ServerStatus', {
 		{
 		    xtype: 'proxmoxRRDChart',
 		    title: gettext('Root Disk IO Delay (ms)'),
-		    fields: ['read_delay','write_delay'],
+		    fields: ['io_delay'],
-		    fieldTitles: [gettext('Read'), gettext('Write')],
+		    fieldTitles: [gettext('IO Delay')],
 		    store: rrdstore
 		},
 	    ]