Understanding NFS Caching Filesystem caching is a great tool for improving performance, but it is important to balance performance with data safety. Caching over NFS involves caches at several different levels, so it is not immediately obvious which…

第7章 高级概念 The Code First modeling functionality that you have seen so far should be enough to get you up and running with most applications. However, Code First also includes some more advanced functionality that you may require as your needs advance.…

原文 Understanding Weak References Posted by enicholas on May 4, 2006 at 5:06 PM PDT 译文 我面试的这几个人怎么这么渣啊,连弱引用概念都没有.不行,我要写一篇吐槽一下. 相信我,弱引用很重要. 强引用(Strong references) 首先先回顾一下强引用(strong reference).强引用是常规的Java引用,你每天都会使用.例如: StringBuffer buffer = new StringBuf…

Understanding Virtual Memory by Norm Murray and Neil Horman Introduction Definitions The Life of a Page Tuning the VM Example Scenarios Further Reading About the Author Introduction One of the most important aspects of an operating system is the Virt…

Understanding Weak References Posted by enicholas on May 4, 2006 at 5:06 PM PDT Some time ago I was interviewing candidates for a Senior Java Engineer position. Among the many questions I asked was "What can you tell me about weak references?" I…

The Guide To Understanding mysqlreport This guide to understanding mysqlreport explains everything that mysqlreport can report. It also teaches how to interpret and understand all the values in context so that after reading a mysqlreport report ("a r…

I've written multiple articles here at Javalobby on the Hibernate O/R mapping tool, and they are usually met with a large degree of popularity. Hibernate isn't just a popular kid on the block, however; it is actually a very powerful, consistent, and…

We have spent last couple of months stabilizing the lock detection functionality in Plumbr. During this we have stumbled into many tricky concurrency issues. Many of the issues are unique, but one particular type of issues keeps repeatedly appearing.…

博客地址:http://www.loveweir.com/ 环境虚拟机centos6.5 主机名h1  IP 192.168.137.11  作为DNS FNS的server 主机名h2  IP 192.168.137.12 主机名h3  IP 192.168.137.13 建立DNS(为了代替集群改动hosts带来的大量反复工作) 1.安装DNS在h1上面 检查命令: rpm –q bind rpm -q bind-chroot 安装命令: yum -y install bind bind-c…

mount -t nfs 10.173.55.154:/oradata /oradatamount: wrong fs type, bad option, bad superblock on 10.173.55.154:/oradata,       missing codepage or helper program, or other error       (for several filesystems (e.g. nfs, cifs) you might       need a /s…

iOS Assembly Tutorial: Understanding ARM Do you speak assembly? When you write Objective-C code, it eventually turns into machine code – the raw 1s and 0s that the ARM CPU understands. In between machine code and machine code, though, is the still hu…

1.1 概述 类似ext家族.xfs格式的本地文件系统,它们都是通过单个文件名称空间(name space)来包含很多文件,并提供基本的文件管理和空间分配功能.而文件是存放在文件系统中(上述名称空间内)的单个命名对象,每个文件都包含了文件实际数据和属性数据.但是,这些类型的文件系统和其内文件都是存放在本地主机上的. 实际上,还有网络文件系统.顾名思义,就是跨网络的文件系统,将远程主机上的文件系统(或目录)存放在本地主机上,就像它本身就是本地文件系统一样.在Windows环境下有cifs协议实现的…

Stephen Toub Download the Code Sample Asynchronous programming has long been the realm of only the most skilled and masochistic of developers-those with the time, inclination and mental capacity to reason about callback after callback of non-linear c…

Caching large objects, duplicate objects, caching collections, live objects, thread unsafe caching and other common mistakes break your app instead of making it fly. Learn ten common caching mistakes devs make. Introduction Caching frequently used ob…

通过‘fstab’也可以配置 NFS 和 SMB 的共享目录.由于涉及到的可选项很重要,并且需要了解一些协议的工作情况,您得先阅读 Samba 和 NFS . 基本语法和本地介质相差不是很多.条目中的‘device file’换成了远程服务器(remote server)和共享目录(share): remote_server:share local_mount_point file_system options dump fsck 服务器‘domain.com’上的‘/share/nfs’目录如…

https://www.codeproject.com/Articles/630346/Understanding-how-SQL-Server-executes-a-query https://www.codeproject.com/Articles/732812/How-to-analyse-SQL-Server-performance     This article will help you write better database code and will help you ge…

In a recent meeting, some folks on my team needed some guidance on load testing the Web application that one of my feature teams are developing. The questions on load testing subsided rather quickly and prior to pluggin my ears with my headphones for…

Linux IO/NFS tunning:IO Test=======dd 测试读性能的命令# time dd if=/nfsfolder/testfile of=/dev/null bs=1kdd 测试写性能的命令time -p dd if=/dev/zero of=test.file bs=1k count=100000[1]Write time -p dd if=/dev/zero of=test.file bs=1k count=100000100000+0 records in1000…

系统版本:CentOS Linux release 7.4.1708 (Core) $ vi /etc/nfsmount.conf # # /etc/nfsmount.conf - see nfsmount.conf(5) for details # # This is an NFS mount configuration file. This file can be broken # up into three different sections: Mount, Server and Glo…

http://woxihuanpes.blog.163.com/blog/static/12423219820097139145238/ http://blog.csdn.net/willvc123/article/details/6325615 [root@lk1 ~]# exportfs -au [root@lk1 ~]# df df: `/mnt': Stale file handle Filesystem 1K-blocks Used Available Use% Mounted on…

转载 http://woxihuanpes.blog.163.com/blog/static/12423219820097139145238/ NFS server可以看作是一个FILE SERVER,它可以让你的PC通过网络将远端得NFS SERVER共享出来的档案MOUNT到自己的系统中,在CLIENT看来使用NFS的远端文件就象是在使用本地文件一样. NFS协议从诞生到现在为止,已经有多个版本,如NFS V2(rfc1094),NFS V3(rfc1813)(最新的版本是V4(rfc301…

简言之,NFS(Network FileSystem,网络文件系统)用于在不同机器,不同操作系统之间通过网络互相分享各自的文件.NFS设计之初就是为了在不同的系统间使用,所以它的通讯协议设计与主机及操作系统无关.NFS分服务器和客户机,当使用远端文件时只要用mount命令就可把远端NFS服务器上的文件系统挂载在本地文件系统之下,操作远程文件与操作本地文件没有不同.NFS服务器所共享文件或目录记录在/etc/exports文件中.嵌入式Linux开发中,会经常使用NFS,目标系统通常作为NFS客户…

RAC在LINUX上使用NFS安装前准备(六) 概述:写下本文档的初衷和动力,来源于上篇的<oracle基本操作手册>.oracle基本操作手册是作者研一假期对oracle基础知识学习的汇总.然后形成体系的总结,一则进行回顾复习,另则便于查询使用.本图文文档亦源于此.阅读Oracle RAC安装与使用教程前,笔者先对这篇文章整体构思和形成进行梳理.由于阅读者知识储备层次不同,我将从Oracle RAC安装前的准备与规划开始进行整体介绍安装部署Oracle RAC.始于唐博士指导,对数据库集群进…

NFS全称是Network File System,网络文件系统.它可以通过网络实现文件共享.其结构图大概是这样的: 在机器E上开启NFS服务,机器ABCD都挂载NFS,这样可以实现机器ABCD共享文件. 由于文件共享的特性,NFS还被用作分布式系统的备份.比如Elasticsearch集群的备份需要用到NFS. 服务端 首先开启NFS服务端,在Ubuntu中的命令如下: sudo apt-get update sudo apt-get install nfs-kernel-server 然后我…

nfs挂载步骤 服务器端 1.安装nfs-utils rpcbind $sudo yum –y install nfs-utils rpcbind 2.文件开放出去配置/etc/exports 例子:/opt/data IP(rw, no_root_squash,no_all_squash,sync) 3.执行配置文件/etc/exports $exportfs -r 4.Nfs配置生效并使rpcbind和nfs服务开机启动 $sudo systemctl enable rpcbind $sud…

一.软件包安装 yum -y install nfs-utils  rpcbind 二.服务器端配置共享目录 1. 在服务器上创建NFS共享目录:mkdir /usr/local/test 2. 设置共享目录的读写权限: chmod 666 /usr/local/test 三.NFS服务器配置 NFS服务器的配置相对比较简单,只需要在相应的配置文件中进行设置,然后启动NFS服务器即可. NFS的常用目录 /etc/exports NFS服务的主要配置文件/usr/sbin/exportfs NF…

10.3 NFS服务端部署环境准备 10.3.1 NFS服务部署服务器准备 服务器系统 角色 IP Centos6.7 x86_64 NFS服务器端(NFS-server) 192.168.1.14 Centos6.7 x86_64 NFS客户端(Web-lamp01) 192.168.1.15 Centos6.7 x86_64 NFS客户端(Web-lnmp02) 192.168.1.16 10.3.2 NFS服务部署架构图 10.3.3 NFS服务器端操作系统及内核版本 [root@NFS-…

一.NFS服务简介 NFS 是Network File System的缩写,即网络文件系统.一种使用于分散式文件系统的协定,由Sun公司开发,于1984年向外公布.功能是通过网络让不同的机器.不同的操作系统能够彼此分享个别的数据,让应用程序在客户端通过网络访问位于服务器磁盘中的数据,是在类Unix系统间实现磁盘文件共享的一种方法. NFS 的基本原则是“容许不同的客户端及服务端通过一组RPC分享相同的文件系统”,它是独立于操作系统,容许不同硬件及操作系统的系统共同进行文件的分享. NFS在文件传…

nfs服务端: 编辑/etc/nfsmount.conf,在末尾添加: RQUOTAD_PORT=30001LOCKD_TCPPORT=30002LOCKD_UDPPORT=30002MOUNTD_PORT=30003STATD_PORT=30004 nfs客户端防火墙: iptables -A INPUT -s 10.46.121.240 -p tcp -m multiport --dport 111,2049,30001:30004 -j ACCEPTiptables -A INPUT -s…

在之前的版本中,Session存在于System.Web中,新版ASP.NET 5中由于不在依赖于System.Web.dll库了,所以相应的,Session也就成了ASP.NET 5中一个可配置的模块(middleware)了. 配置启用Session ASP.NET 5中的Session模块存在于Microsoft.AspNet.Session类库中,要启用Session,首先需要在project.json中的dependencies节点中添加如下内容: "Microsoft.AspNet.…