volume

LVM逻辑卷

由 隐身守侯 提交于 2019-12-26 17:50:35
文章目录 1、背景：为什么要有逻辑卷这个东西？ 2、简介：逻辑卷是什么？ 1、概念术语 2、架构 3、 原理 4、工作流程 3、安装Lvm 4、创建和管理Lvm 1、创建物理卷 2、查看物理卷创建是否成功 3、 创建data卷组： 4、 查看卷组是否创建成功： 5、 激活卷组 6、 创建新的物理卷 7、 将新的物理卷添加到现有卷组： 8、 查看卷组信息： 9、从现有的卷组中删除一个物理卷： 10、创建逻辑卷 11、创建文件系统： 12、挂载文件系统 13、删除LV 14、扩容LV 卷管理常用命令集合 参考 1、背景：为什么要有逻辑卷这个东西？ 每个Linux使用者在安装Linux时 都会遇到这样的困境：在为系统分区时，如何精确评估和分配各个硬盘分区的容量，因为系统管理员不但要考虑到当前某个分区需要的容量，还要预见该分区以后可能需要的容量的最大值。因为如果估计不准确，当遇到某个分区不够用时管理员可能甚至要备份整个系统、清除硬盘、重新对硬盘分区，然后恢复数据到新分区。 虽然现在有很多动态调整磁盘的工具可以使用，例如Partation Magic等等，但是它并不能完全解决问题，因为某个分区可能会再次被耗尽；另外一个方面这需要重新引导系统才能实现，对于很多关键的服务器，停机是不可接受的，而且对于添加新硬盘，希望一个能跨越多个硬盘驱动器的文件系统时，分区调整程序就不能解决问题。

How to make the color in bar chart of Highstock look like in candlestick chart?

由 有些话、适合烂在心里 提交于 2019-12-25 09:54:07
问题 Can volume chart's color same as the candlestick's color above? I tried give a color list in series with the colors: ['red', 'red', 'green', ...] colorByPoint: true Highstock source code: init: function (series, options, x) { var point = this, colors; point.series = series; point.color = series.color; // #3445 point.applyOptions(options, x); point.pointAttr = {}; if (series.options.colorByPoint) { colors = series.options.colors || series.chart.options.colors; point.color = point.color ||

javascript MouseWheel event & video volume - prevent page scroll

由 我是研究僧i 提交于 2019-12-25 01:09:40
问题 I'm trying to control a video volume using the MouseWheel, I want to completely disable the page scroll when my mouse is over the video, it works but there's a problem when the video's volume reaches the min & max levels: the page scroll begins...and I don't want the page scroll if my mouse is over the video! Actually I'm trying it in chrome: var popo = document.getElementById('popo'); var coco = document.getElementById('coco'); //popo.play(); //setTimeout(function(){ // popo.pause(); //}

GlusterFS分布式文件系统概述

由 ≯℡__Kan透↙ 提交于 2019-12-24 18:26:39
博文目录 一、GlusterFS概述 1、GlusterFS的特点 2、GlusterFS术语 3、模块化堆栈式架构 二、GlusterFS的工作原理 1、GlusterFS的工作流程 2、弹性HASH算法 三、GlusterFS的卷类型 1、分布式卷 2、条带卷 3、复制卷 4、分布式条带卷 5、分布式复制卷 一、GlusterFS概述 GlusterFS是一个开源的分布式文件系统，同时也是Scale-Out存储解决方案Gluster的核心，在存储数据方面有强大的横向扩展能力，通过扩展不同的节点可以支持PB级别的存储容量。GlusterFS借助TCP/IP或InfiniBand RDMA网络将分散的存储资源汇聚在一起，同一提供存储服务，并使用单一全局命令空间来管理数据。GlusterFS基于可堆叠的用户空间以及无元的设计，可为各种不同的数据负载提供优异的性能。 GlusterFS主要由存储服务器、客户端及NFS/Samba存储网关（可选，根据需要选择使用）组成。GlusterFS架构中最大的设计特点就是没有元数据服务器组件，这有助于提升整个系统的性能、可靠性和稳定性。传统的分布式文件系统大多通过元服务器来存储元数据，元数据包含存储节点上的目录信息、目录结构等，这样的设计在浏览目录时效率非常高，但是也存在一些缺陷，如单点故障，一旦元数据服务器出现故障，即使节点具备再高的冗余性

iPhone: Implement Volume control using buttons

由 眉间皱痕 提交于 2019-12-24 12:41:58
问题 Could anyone please tell me how could I implement the functionality of adjusting the volume on button click? Basically I am trying to put two buttons Volume Up and Volume Down but I couldn't find anyway to adjust the volume of button click. This link mentions about the MPVolumeView but I can't find it in my XCode 4.0 objects list and also I am not sure if I can use that for button click volume adjust. Could someone please point me in correct direction. 回答1: If I'm understanding you correctly,

lvm磁盘扩容

由 怎甘沉沦 提交于 2019-12-24 05:35:58
LVM实现新挂载磁盘扩容到原有目录 1 #查看磁盘 2 fdisk -l 3 #创建pv 4 pvcreate /dev/sdb 5 [root@VM-67-49 ~]# pvcreate /dev/sdb 6 Physical volume "/dev/sdb" successfully created. 7 [root@VM-67-49 ~]# pvdisplay 8 --- Physical volume --- 9 PV Name /dev/sda2 10 VG Name centos 11 PV Size 29.51 GiB / not usable 3.00 MiB 12 Allocatable yes 13 PE Size 4.00 MiB 14 Total PE 7554 15 Free PE 10 16 Allocated PE 7544 17 PV UUID jfRAJl-pnUs-8lXi-1F37-IX3t-Nq8S-RdtQvq 18 19 "/dev/sdb" is a new physical volume of "100.00 GiB" 20 --- NEW Physical volume --- 21 PV Name /dev/sdb 22 VG Name 23 PV Size 100.00 GiB 24 Allocatable NO 25 PE

javascript volume calculator from width, length and depth

由 邮差的信 提交于 2019-12-24 01:41:15
问题 I'm not amazing at maths, I must admit :) Essentially I need to create a calculator that takes: 1. width 2. length 3. depth From these inputs, I need to display the answer in m³. Making it a little more tricky, a user can choose between 5 drop-down options: 1. Centimeter 2. Inches 3. Feett 4. Yards 5. Meters For example, a user could do something like: width = 10 centimeters length = 7 foot depth = 2 inches So my thought was to convert all user input into millimeters to make them the same

How to play tracks from iPod music library with different volume than system volume?

由 ε祈祈猫儿з 提交于 2019-12-24 00:16:02
问题 How can I play music from the ipod music library (like user-defined playlists, etc.) at a different volume than the system volume? 回答1: This is for anyone who is trying to play music / playlists from the ipod music library at a different volume than the system volume. There are several posts out there saying that the [MPMusicPlayerController applicationMusicPlayer] can do this, but I have found that anytime I change the volume of the applicationMusicPlayer, the system volume changes too.

Mute webview in android apps

由 邮差的信 提交于 2019-12-23 17:30:44
问题 I'm building an app that includes some WebViews . I want to mute one of them (not the whole app or device just that specific WebView ) I searched but there's no certain answer to this question. Is there anyone knows how to mute a WebView sound in Android? 回答1: You can't mute only WebViews volume, but you can mute the whole system volume when you are showing the WebView. Like : When you are showing that particular WebView use the below method : public static void mute(Context context) {

AVPlayer Questions, while Live Streaming (iOS)

由 怎甘沉沦 提交于 2019-12-23 13:11:12
问题 I have AVPlayer Questions. 1.How to control the volume of it? 2.How to know if the AVPlayer is reloading music because bad connection, do i have some inidication of it? 回答1: AVPlayer uses the system volume, so if you need to provide controls for this you can use MPVolumeView which gives you the slider for volume control. For audio fading, you can use an AVAudioMix . Here's some code: //given an AVAsset called asset... AVPlayerItem *playerItem = [AVPlayerItem playerItemWithAsset:asset]; id
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