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, it can affect performance.Just as important as memory is the tuning of the disk system, which is especially important for the impact of the ESX server disk system. The disk hosting the ESX server kernel, as well as the kernel image, and the console system files should be equipped with RAID1 protectionWe do not recommend using on-board LSI for raid, 5i 6i 6m car
kernel, as well as the kernel image, and the console system files should be equipped with RAID1 protection We do not recommend using on-board LSI for raid, 5i 6i 6m cards are recommended because the onboard LSI has a slow CPU, no cache, no battery protection, and therefore is not recommended for use in production environments For VMFS Storage, we recommend hosting with the best storage devices available. For example: With many disks for RAID, the mor
Solve VMware below CentOS a problem with a slow or too fast clockIn a VMware virtual machine, because the time is not synchronized with the real clock, there are many problems in development, such as Makefile files that cause unnecessary duplication, and even some programs refuse to compile. I tried to run ntpd to sync the clock, but often because of the erro
interrupt rate. 100Hz is adequate for most applications in a Linux guest. see the documentation for your Linux distribution for detailed instructions on how to build and run a custom kernel. before recompiling the guest kernel, locate the following line in/usr/src/linux-2.6/include/asm-i386/Param. h:# Define hz1000 Change the value of Hz to 100:# Define hz100 A different way to deal with a slow guest clock is to increase the host timer interrupt rate
May be living in this fast-paced society for a long time, everyone in doing things like fast, even when using the mouse, but also want the mouse to run speed to keep pace with their own rhythm, once encountered it slow to keep pace with the time, it will be particularly annoying, want to let it get up, So what causes the speed of the mouse to slow down, we will come together to troubleshoot it!In general, t
In the company, in order to make full use of server performance, I installed a VMware Server2.0 on the server, is really convenient, and free, and stable, after a series of tuning, the speed is very good (specific tuning process, query my previous post), a computer changed a lot of servers (that is, hard disk IO is limited, Back to apply for a hard drive).Recent
Tags: good ora read Otto understanding. com None Related configuration torVMWare Esx/esxi has two hard disk provisioning methods, thick prep (thick) and thin provisioning (Thin)There may be times when a virtual machine disk can be turned between two modes due to performance issues or disk space, although there is no wa
time to solve the problem. In particular, the key service host services, such as DNS host, RADIUS authentication host, Mail gateway and other important equipment is reaching. Once there is a problem with the virtual center, managers are at a loss to find the underlying problem quickly and efficiently.Addressing the root causes of today's applications and virtualized infrastructures requires visibility into application services, networks, and virtualized architectures that apply to the various d
Transferred from: http://www.wiser001.cn/2014/11/21/vmware-esxesxi-%E8%99%9A%E6%8B%9F%E6%9C%BA%E7%A1%AC%E7%9B%98%E7%9A%84%E5% 8e%9a%e7%bd%ae%e5%a4%87thick-provision%e4%b8%8e%e7%b2%be%e7%ae%80%e7%bd%ae%e5%a4%87thin-provision%e7%9a%84%e8% bd%ac/VMWare Esx/esxi has two hard disk provisioning methods, thick prep (thick) and thin provisioning (Thin)There may be times
Why is the server disk io so slow? PC users often think that "the disk is fast, so it takes 2 minutes for brother to copy a 1 GB film" The server engineer may think that "Why is the disk so slow, I/O is full in 1 Mbit/s, and his meow dis
, 3692420k cachedSum up:KVM memory usage efficiency is high, hard disk write speed is slow, CPU utilization is stable, also lowVMware memory usage is not high, hard disk read and write fast, high CPU utilizationThe overall performance of KVM and VMware is not visible from da
Background:Previously, I used vmware7.1.1 to install ubuntu10.10 on a virtual hard disk in windows. It is used for software development. Who knows that the vmdk virtual hard disk is getting bigger and bigger when code is compiled all day long!Even if you delete files in the Ubuntu System of the virtual machine, the vmdk virtual hard disk files in windows are stil
number of I/O read operations.7. High load handling after the problem occursAs of this point, this chapter discusses how to find the cause of high loads when the system is overloaded. While top and iostat are great tools, we're not always lucky enough to find a solution when something happens to the system. I can't remember how many times I've met. The machine is running slowly and can only wait for the load to drop to log in. With just a little bit more work, you can install the tools on the s
determine the suspicious slow disk node, assuming that the exception node has been found, the following is how to find the above slow disk, this method is not as complicated as it is, here is the simplest way to write 1 scripts to execute on all disks Time mkdir test rm-r-F test It is possible to observe which
Why is the server so slow? CPU, RAM, and disk I/O resources are exhausted, and ram is used up Machine running is slow because it consumes too many system-specific resources. The main resources of the system include CPU, RAM, disk I/O, and network. Excessive use of any of these resources puts the system in trouble. Howe
In fact, lead disk transmission speed slow mainly from three aspects: U disk Interface, u disk File system, computer and U disk interface, Small series using is USB2.0, computer support USB3.0, in the interface there is nothing to say, the problem is mainly out of the U
Linux hard disk Performance Detection and linux hard disk Detection For today's computers, the performance of the entire computer is mainly affected by the disk I/O speed, and the speed of memory, CPU, and motherboard bus has become very fast.Basic detection method 1. dd com
Sometimes we use U disk when the speed is too slow, if the elimination of infected computer viruses and U disk itself quality problems, may be because the use of U disk does not open the system "open after write cache" this function. The following is the specific way to write caching after opening: Right-click "My Com
|+---------------+-----------+| Com_select | 222693559 |+---------------+-----------+Calculate table Scan Rate:Table Scan rate = Handler_read_rnd_next/com_selectIf the table scan rate exceeds 4000, indicating that there are too many table scans, it is likely that the index is not built, and that increasing the read_buffer_size value will have some benefits, but it is best not to exceed 8MB.Postscript:The article mentions that some numbers are reference values, understand the basic principle, in
When you create a disk, you do two things: allocate space, place zeros1, thick provision delay 0 :the default creation format, when the disk is created, is directly from the disk Allocate Space , but retains data on the disk No Reset 0 . So when there is an I/O operation, only the zero operation is required. Good
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