Ubuntu : Status 14: The disk contains an unclean file system By mkyong | July 23, 2014 | Viewed : 10,649 times +47 pv/w Dual boot Windows and Ubuntu, but Ubuntu is unable to access the Windows partition /dev/sdb3, shows the following error message :…

File System Basics The file systems in OS X and iOS handle the persistent storage of data files, apps, and the files associated with the operating system itself. Therefore, the file system is one of the fundamental resources used by all processes. OS…

SRC=http://www.cs.rutgers.edu/~pxk/416/notes/13-fs-studies.html Paul Krzyzanowski April 24, 2014 Introduction We've studied various approaches to file system design. Now we'll look at some real file systems to explore the approaches that were taken i…

1.磁盘基础知识 1.1 物理结构 硬盘的物理结构一般由磁头与碟片.电动机.主控芯片与排线等部件组成:当主电动机带动碟片旋转时,副电动机带动一组(磁头)到相对应的碟片上并确定读取正面还是反面的碟面,磁头悬浮在碟面上画出一个与碟片同心的圆形轨道(磁轨或称柱面),这时由磁头的磁感线圈感应碟面上的磁性与使用硬盘厂商指定的读取时间或数据间隔定位扇区,从而得到该扇区的数据内容.所有的盘片都固定在一个旋转轴上,这个轴即盘片主轴.而所有盘片之间是绝对平行的,在每个盘片的存储面上都有一个磁头,磁头与盘片之间的距…

最近在思考和实践怎样应用重复数据删除技术到云存储服务中.找了些论文来读,其中<Avoiding the Disk Bottleneck in the Data Domain Deduplication File System>是鼎鼎大名的李凯教授出品,读来收益匪浅. 论文主要内容 Data Domain的去重存储系统是商业上大获成功的产品,从产品的角度来讲非常完善,其架构图如下: 去重存储系统在数据存储和重建的过程中,都需要频繁地访问数据块的索引,即图中的Segment Index.为了降低成…

參考文献: Harley Hahns:Guide to Unix and Linux. Chap 24 -->首先要有的关键概念:the amount of "disk space" used by a file is not the same as the amount of data in the file. -->其次,理解在file system和disk(or other storage medium)中都存在各自的最小空间单元:file system中叫&quo…

A mechanism is provided in a data processing system for reliable asynchronous solid-state device based de-duplication. Responsive to receiving a write request to write data to the file system, the mechanism sends the write request to the file system,…

在使用fdisk创建分区时,我们会使用partprobe命令可以使kernel重新读取分区信息,从而避免重启系统,但是有时候会遇到下面错误信息"Warning: Unable to open /dev/sr0 read-write (Read-only file system). /dev/sr0 has been opened read-only.",如下所示: [root@getlnx14test scsi_device]# fdisk /dev/sde   The number…

环境:DB VERSION: 11.2.0.4.0RAC 2 nodes 问题:邮件显示rman备份失败,查看rman备份日志 Starting Control File and SPFILE Autobackup at 2013-12-30 04:07:02released channel: c1released channel: c2released channel: c3released channel: c4RMAN-00571: ============================…

之前在项目里用MQ是用单节点,因为业务量不大没有主从.这样风险很大,会有单点问题.新项目起来了,需要一个高可用的MQ,故研究了下AMQ的几种master-slave方式: 1.Pure Master-Slave 5.8版本之后已经不支持了,主要原因是Master挂了之后再起来无法自动融入集群,需要停掉MQ重新启动才可以.这里略过. http://activemq.apache.org/pure-master-slave.html 2.Share File System Master-Slave…