linux配置软raid0.docx

1.1.1 创建/dev/md0分区需要通过操作系统创建软raid分区，创建分区有两种办法，一是在安装操作系统时创建，二是安装操作系统之后通过命令创建。本文重点介绍一下第二种办法。1. 将sda4创建软raid分区格式，命令如下：rootCT7001 root# fdisk /dev/sdaThe number of cylinders for this disk is set to 38913.There is nothing wrong with that, but this is larger than 1024,and could in certain setups cause problems with:1) software that runs at boot time (e.g., old versions of LILO)2) booting and partitioning software from other OSs (e.g., DOS FDISK, OS/2 FDISK)Command (m for help): nCommand action e extended p primary partition (1-4)pSelected partition 4First cylinder (1841-38913, default 1841): Using default value 1841Last cylinder or +size or +sizeM or +sizeK (1841-38913, default 38913): Using default value 38913Command (m for help): tPartition number (1-4): 4Hex code (type L to list codes): fdChanged system type of partition 4 to fd (Linux raid autodetect)Command (m for help): wThe partition table has been altered!Calling ioctl() to re-read partition table.WARNING: Re-reading the partition table failed with error 16: 设备或资源忙.The kernel still uses the old table.The new table will be used at the next reboot.Syncing disks.2. 将sdb创建软raid分区格式，命令如下：rootCT001 root# fdisk /dev/sdbThe number of cylinders for this disk is set to 38913.There is nothing wrong with that, but this is larger than 1024,and could in certain setups cause problems with:1) software that runs at boot time (e.g., old versions of LILO)2) booting and partitioning software from other OSs (e.g., DOS FDISK, OS/2 FDISK)Command (m for help): nCommand action e extended p primary partition (1-4)pPartition number (1-4): 1First cylinder (1-38913, default 1): Using default value 1Last cylinder or +size or +sizeM or +sizeK (1-38913, default 38913): Using default value 38913Command (m for help): tSelected partition 1Hex code (type L to list codes): fdChanged system type of partition 1 to fd (Linux raid autodetect)Command (m for help): wThe partition table has been altered!Calling ioctl() to re-read partition table.Syncing disks.3. 将sdc，sdd创建软raid分区格式，命令参照sdb：4. 创建md1，命令如下：rootCT7001 root# mdadm -C /dev/md1 -level=0 -raid-devices=4 /dev/sda4 /dev/sdb1 /dev/sdc1 /dev/sdd1 mdadm: /dev/sda4 appears to be part of a raid array: level=1 devices=4 ctime=Fri Feb 9 15:40:51 2007mdadm: /dev/sdb1 appears to be part of a raid array: level=1 devices=4 ctime=Fri Feb 9 15:40:51 2007mdadm: /dev/sdc1 appears to be part of a raid array: level=1 devices=4 ctime=Fri Feb 9 15:40:51 2007mdadm: /dev/sdd1 appears to be part of a raid array: level=1 devices=4 ctime=Fri Feb