Linux CentOS 5.5 软RAID10 (一)磁盘分区与格式化

raid 英文全称是 Redundant Array of Independent Disk ，独立冗余磁盘阵列，  有 raid 0  raid 1  raid 10  raid 01  raid  5   raid 50  等等。

一.新增四块scsi磁盘

比如用虚拟机新增4个1G大小的磁盘，分别是

/dev/sdb  /dev/sdc  /dev/sdd  /dev/sde

二.分别对四块磁盘进行分区

此处以 /dev/sdb为例，其他三块都类似，直接只分一个主分区

fdisk /dev/sdb
Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel
Building a new DOS disklabel. Changes will remain in memory only,
until you decide to write them. After that, of course, the previous
content won't be recoverable.

Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)

Command (m for help): m
Command action
   a   toggle a bootable flag
   b   edit bsd disklabel
   c   toggle the dos compatibility flag
   d   delete a partition
   l   list known partition types
   m   print this menu
   n   add a new partition
   o   create a new empty DOS partition table
   p   print the partition table
   q   quit without saving changes
   s   create a new empty Sun disklabel
   t   change a partition's system id
   u   change display/entry units
   v   verify the partition table
   w   write table to disk and exit
   x   extra functionality (experts only)

Command (m for help): l

 0  Empty           1e  Hidden W95 FAT1 80  Old Minix       bf  Solaris       
 1  FAT12           24  NEC DOS         81  Minix / old Lin c1  DRDOS/sec (FAT-
 2  XENIX root      39  Plan 9          82  Linux swap / So c4  DRDOS/sec (FAT-
 3  XENIX usr       3c  PartitionMagic  83  Linux           c6  DRDOS/sec (FAT-
 4  FAT16 <32M      40  Venix 80286     84  OS/2 hidden C:  c7  Syrinx        
 5  Extended        41  PPC PReP Boot   85  Linux extended  da  Non-FS data   
 6  FAT16           42  SFS             86  NTFS volume set db  CP/M / CTOS / .
 7  HPFS/NTFS       4d  QNX4.x          87  NTFS volume set de  Dell Utility  
 8  AIX             4e  QNX4.x 2nd part 88  Linux plaintext df  BootIt        
 9  AIX bootable    4f  QNX4.x 3rd part 8e  Linux LVM       e1  DOS access    
 a  OS/2 Boot Manag 50  OnTrack DM      93  Amoeba          e3  DOS R/O       
 b  W95 FAT32       51  OnTrack DM6 Aux 94  Amoeba BBT      e4  SpeedStor     
 c  W95 FAT32 (LBA) 52  CP/M            9f  BSD/OS          eb  BeOS fs       
 e  W95 FAT16 (LBA) 53  OnTrack DM6 Aux a0  IBM Thinkpad hi ee  EFI GPT       
 f  W95 Ext'd (LBA) 54  OnTrackDM6      a5  FreeBSD         ef  EFI (FAT-12/16/
10  OPUS            55  EZ-Drive        a6  OpenBSD         f0  Linux/PA-RISC b
11  Hidden FAT12    56  Golden Bow      a7  NeXTSTEP        f1  SpeedStor     
12  Compaq diagnost 5c  Priam Edisk     a8  Darwin UFS      f4  SpeedStor     
14  Hidden FAT16 <3 61  SpeedStor       a9  NetBSD          f2  DOS secondary 
16  Hidden FAT16    63  GNU HURD or Sys ab  Darwin boot     fb  VMware VMFS   
17  Hidden HPFS/NTF 64  Novell Netware  b7  BSDI fs         fc  VMware VMKCORE
18  AST SmartSleep  65  Novell Netware  b8  BSDI swap       fd  Linux raid auto
1b  Hidden W95 FAT3 70  DiskSecure Mult bb  Boot Wizard hid fe  LANstep       
1c  Hidden W95 FAT3 75  PC/IX           be  Solaris boot    ff  BBT           

Command (m for help): n
Command action
   e   extended
   p   primary partition (1-4)

Command action
   e   extended
   p   primary partition (1-4)
p
Partition number (1-4): 1
First cylinder (1-130, default 1):
Using default value 1
Last cylinder or +size or +sizeM or +sizeK (1-130, default 130):  
Using default value 130

Command (m for help): w
The partition table has been altered!

Calling ioctl() to re-read partition table.
Syncing disks.

三.对磁盘分区进行格式化
fsck -t ext3 /dev/sd{b,c,d,e}1 

此处，我格式化为 ext3 文件系统，也可以格式化为ext4  等其他文件系统