iostat tablets

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

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of the word "system", not to mention Linux, it is a face, until the teacher talked about the Linux system, the heart has a little concept, only know that it is able to run the high-level "software" on the computer, real to deep learning, Just understand is a better than Windows operating system, and is open source, perhaps beginners mistakenly think open source is free, wrong! This can be said in turn (free is open source). He is a free and open-source Unix-like operating system that anyone can

IO. sh # iostat is used to view disk activity statistics # display the load of all devices r/s: The number of read I/O devices completed per second. That is, rio/s; w/s: the number of write I/O devices completed per second. That is, iostat such as wio/s # refresh the disk IO information every 2 seconds, in addition, iostat is displayed three times at a time.

First, check the hard disk read speedCommand: Hdparm-t/dev/sda5Printed: Timing buffered disk reads:254 MB in 3.01 seconds = 84.34 mb/secDescription: Be able to specify which hard disk to query for!Second, find the most consumption of iowait processOperation Steps:1./etc/init.d/syslog Stop2. Echo 1 >/proc/sys/vm/block_dump3. DMESG | Egrep "read| Write|dirtied "| Egrep-o ' ([a-za-z]*) ' | Sort | uniq-c | Sort-rn | HeadDon't forget to turn off Block_dump and start the syslog when you're done.4. ech

buffers Cached 3 Mem: 1006988 17 0 96 72 4 -/+ buffers/cache: 819 1865 Swap: 2015 1 2014 The 3rd line represents the data from a system perspective, where used contains buffers and cachedThe 4th line is the data represented from the application's perspective, used is the memory occupied by the real applicationLine 3rd used = 4th row of used+ 3rd row of buffers and cachedThe 5th Behavior Swap area information, respectively, is the total amount of the exchange, the amount of usage (us

Linux Performance Tuning Command essenceTime: 2010-6-23First, see the hard drive read speedCommand: Hdparm-t/dev/sda5Printed: Timing buffered disk reads:254 MB in 3.01 seconds = 84.34 mb/secDescription: Can specify which hard disk to query the OH.Ii. finding the most iowait-consuming processOperation Steps:1./etc/init.d/syslog Stop2. Echo 1 >/proc/sys/vm/block_dump3. DMESG | Egrep "read| Write|dirtied "| Egrep-o ' ([a-za-z]*) ' | Sort | uniq-c | Sort-rn | HeadDon't forget to turn off Block_dump

complexity of the system is 4, it means that the machine has enough resources to handle the work it needs to do, of course, it is barely. In the same 4-core system, if the average complexity is 8, it means that the server system needs 8 cores to process the work to be done, but now there are only 4 cores, so it is overloaded. If the system displays a high average load, but the CPU usage of the system and user is low, you need to observe the IO wait (I/O wait ). In the linuc system, IO wait has

io.sh# #iostat是查看磁盘活动统计情况 # #显示全部设备负载情况 r/s: Number of Read I/O devices completed per second. That is, rio/s;w/s: The number of write I/O devices completed per second. That is, wio/s and other Iostat # #每隔2秒刷新磁盘IO信息, and 3 times per display Iostat 2 3# show the IO information of a disk iostat-d sda1# #显示tty和cpu信息

which disk is being written to Find that disk is being written The above top command shows I/O wait from the system as a whole but it does don't tell you what disk is being affected; For this we'll use the Iostatcommand. The top command above describes an I/O wait as a whole, but it does not indicate which disk is affected and what disk is causing the problem, we have used another command Iostat command $ ios