iostat

The first line shows the average value since the subsystem was started, and the next report shows the average of the increments, one row per Devicedevice:rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await SVCTM%utilSDA 0.00 23.75 0.00 5.79 0

Http://pkgs.repoforge.org/dstat/download the corresponding CPU version: Http://nmon.sourceforge.net/pmwiki.php? N = site. DownloadWget http://sourceforge.net/projects/nmon/files/download/nmon_x86_12a.zip/download Unzip nmon_x86_12a.zip Archive: nmon_

1. installation#yum Install Sysstat2. start#/etc/init.d/sysstat start3. self-priming#checkfig Sysstat4. Basic Use#iostat-k 2Refresh every two secondsDevice:tps kb_read/s kb_wrtn/s Kb_read Kb_wrtnSCD0 0.00 0.01 0.00 144 0SDA 4.44 71.99 211.08 1847933

Install the sysstat package on Redhat Linux el4.   [Root @ Nanjing MNT] # umount/mnt/ISO[Root @ Nanjing MNT] # Mount-T iso9660/mnt/hda6/RHEL4-i386-AS-disc4.iso/mnt/ISO-O loop[Root @ Nanjing MNT] # Find/mnt/iso-name "* stat

IntroductionThe Iostat is primarily used to monitor the IO load on the system device, Iostat the statistics from the start of the system startup when the first run, and then running Iostat displays statistics from the last time the command was Run.

IntroductionThe Iostat is primarily used to monitor the IO load on the system device, Iostat the statistics from the start of the system startup when the first run, and then running Iostat displays statistics from the last time the command was Run.

IOSTAT (1) Linux User ' s Manual IOSTAT (1)NAMEIostat-report Central processing Unit (CPU) statistics and input/out-Put statistics for devices, partitions and network filesystems (NFS).SynopsisIostat [-c] [-d] [-n] [-n] [-h] [-k |-m] [-t] [-v] [-x] [

of loss, which will degrade performance. Application caching technology reduces the number of times an application accesses a disk, and caching technology can be applied at the file system level or at the application level. Since the optimized cache technology is already included in most databases, database I/O should directly access the raw disk partition (raw partition) or take advantage of the memory read-write bandwidth far better than the direct disk I/O operation with DIO technology (dire

usage, network traffic, and disk I/O?Q: How can I view CPU, memory usage, network traffic, and disk I/O in the command line mode? A: In command line mode,1. Command for viewing CPU usage$ Vmstat 5Refresh Every 5 seconds, with CPU usage data at the rightmost.$ TopTop, then sort by SHIFT + P, by process processor usage2. Command to view memory usage$ FreeTop and then sort by SHIFT + M, by process memory usage$ Top3. View network trafficYou can use the iptraf tool.$ Iptraf-G"" Can be obtained by c

Deadline scheduling algorithm should be used. View and modify the IO scheduling algorithm: Temporary modification: [Root @ localhost ~] # Cat/sys/block/sda/queue/schedue Noop anticipatory deadline [cfq] [Root @ localhost ~] # Echo noop>/sys/block/sda/queue/schedue [Root @ localhost ~] # Cat/sys/block/sda/queue/schedue [Noop] anticipatory deadline cfq Permanent modification: # Vi/boot/grub/menu. lst Change to the following content: Kernel/boot/vmlinuz-2.6.18-8.el5 ro root = LABEL =/eleva

Tags: 1.2-o proc main two times Stat svc ping share pictureI. Iostat and iowait detailed commentary-View disk bottlenecks one, Iostat basics%iowait does not respond to disk bottlenecks1, installation IostatIostat's bag is called Sysstat.Yum Install sysstat- y2, iowait the actual measurement is CPU time: Time time)Note: high-speed CPUs can cause high iowait values, but this does not mean that the disk is a

. So: The size from the virtual memory to the disk. Io Bi: Total amount of data read by Block devices, read Disk Bo: The total amount of data written by Block devices to a disk. System In: Number of device interruptions per second Cs: Number of context switches per second Cpu Us: cpu usage of user processes Sy: Percentage of cpu consumed by kernel Processes Id: percentage of time when the cpu is idle Wa: percentage of time the I/O waits for the cpu. 1.4 iostat1.4.1 command descript

These tools may have been used, especially the system administrator or Linux Server maintenance students may know these gadgets, there will be a little more, in addition to the system monitoring gadgets, including some MySQL tools, and even in-depth tools will be mentioned.1, probably will tell the contentVmstat/iostat/mpstat/ifstat/dstat:stat class, view system status,Pstack: This command displays the stack trace for each process. The Pstack command

exhausted, and if so, fix the problem first . If you still have a large amount of RAM available, you need to identify which process is consuming most of the I/O operations.Sometimes it's hard to figure out which process is taking up a lot of I/O resources, but if there are multiple partitions in the system, you can narrow down and find which partition is performing a lot of I/O operations. To do this, you need to use the Iostat program, which is avai

Zabbix automatic discovery of hard disk scripts disk_discovery.py[email protected] etc]$ cat disk_discovery.py#/usr/bin/pythonimport subprocessimport jsonargs= "Cat/proc/diskstats | Grep-e ' \ssd[a-z]\s|\sxvd[a-z]\s|\svd[a-z]\s ' |awk ' {print $} ' |sort|uniq 2>/dev/null ' t=subprocess. Popen (args,shell=true,stdout=subprocess. PIPE). Communicate () [0] disks=[] for disk in T.split (' \ n '): If Len (disk)! = 0:disks.append ({' {#DISK_NAME} ':d ISK}) Print json.dumps ({' Data ':d isks},indent=4,

LoadRunnerController menu tools? In gt; options, we can see that the server resource information is collected every 3 seconds, as shown in: nbsp; LoadRunnerController menu tools? Gt; options, we can see that the server resource information is collected every 3 seconds, as shown in LoadRunner Controller menu tools?> In options, we can see that the server resource information is collected every 3 seconds, as shown in: LoadRunner Controller menu tools?> In options, we can see that the server re

Use ten commands to check Linux server performance within one minute If the load on your Linux Server suddenly surges and an alert message is sent to your mobile phone, how can I find out the Linux performance problem in the shortest time? Let's take a look at this blog post by the Netflix performance engineering team and see that they use ten commands to diagnose machine performance problems within one minute.Overview By executing the following command, you can get a rough idea of system resour

Install the sysstat software package bash: Iostat: commandnotfound using the yun command to solve the problem that the iostat command cannot be found [root @ herry ~] # Iostat-bash: Iostat: commandnotfound found that the iostat command does not exist. this is when the system

in the system, you can narrow down the scope, find the partition that is performing a large number of I/O operations. To achieve this, you need to use the iostat program, which is provided in the Red Hat and Debian-based sysstat packages. If the machine is not installed, you can use the package management tool to install it. First, we can see CPU information similar to the top command, followed by the I/O status information of all hard disk devices

Tags: iostatFirst, IostatThe background is that we are doing a lot of data update operations to see the status of the disks.We look at disk IO, and this is mostly done through the Iostat command. -D indicates that the display device (disk) Usage status, removed can be displayed with the CPU status;-K Some columns that use block units are forced to use kilobytes, instead of-m (shown in megabytes);1 5 indicates that the data display is refreshe