# uname -a Linux hs105.localdomain2.6.32-358.el6.x86_64 #1 SMP Tue Jan 29 11:47:41 EST 2013 x86_64 x86_64 x86_64GNU/Linux # cat /etc/redhat-release Red Hat Enterprise Linux Server release 6.4(Santiago)
使用rpm 安裝mdadm
[root@hs105 ~]# mount /dev/cdrom/mnt/cdrom/ mount: block device /dev/sr0 iswrite-protected, mounting read-only [root@hs105 ~]# cd /mnt/cdrom/Packages/ [root@hs105 Packages]# rpm -ivhmdadm-3.2.5-4.el6.x86_64.rpm Preparing... ########################################### [100%] package mdadm-3.2.5-4.el6.x86_64 is already installed
查看安裝文件
[root@hs105 Packages]# rpm -qa mdadm mdadm-3.2.5-4.el6.x86_64 [root@hs105 Packages]# rpm -qc mdadm /etc/cron.d/raid-check /etc/sysconfig/raid-check
格式化硬盤
[root@hs105 Packages]# fdisk /dev/sdb
Device contains neither a valid DOSpartition table, nor Sun, SGI or OSF disklabel
Building a new DOS disklabel with diskidentifier 0xe4366023.
Changes will remain in memory only, untilyou decide to write them.
After that, of course, the previous contentwon't be recoverable.
Warning: invalid flag 0x0000 of partitiontable 4 will be corrected by w(rite)
WARNING: DOS-compatible mode is deprecated.It's strongly recommended to
switch off the mode (command 'c') and change display units to
sectors (command 'u').
Command (m for help): d
No partition is defined yet!
Command (m for help): n
Command action
e extended
p primary partition (1-4)
p
Partition number (1-4): 1
First cylinder (1-3916, default 1):
Using default value 1
Last cylinder, +cylinders or +size{K,M,G}(1-3916, default 3916):
Using default value 3916
Command (m for help): t
Selected partition 1
Hex code (type L to list codes): fd
Changed system type of partition 1 to fd(Linux raid autodetect)
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
創建RAID1卷
[root@hs105 Packages]# mdadm -Cv /dev/md0 -l1 -n2 /dev/sdc /dev/sdb mdadm: /dev/sdc appears to contain anext2fs file system size=31457280K mtime=Thu Aug 1414:57:50 2014 mdadm: Note: this array has metadata at thestart and may not be suitable as a boot device. If you plan to store '/boot' on this device please ensure that your boot-loader understands md/v1.x metadata, or use --metadata=0.90 mdadm: /dev/sdb appears to contain anext2fs file system size=31457280K mtime=Thu Aug 1414:44:05 2014 mdadm: /dev/sdb appears to be part of araid array: level=raid0 devices=0 ctime=Thu Jan 1 08:00:00 1970 mdadm: partition table exists on /dev/sdbbut will be lost or meaningless after creating array mdadm: size set to 31440768K Continue creating array? y mdadm: Defaulting to version 1.2 metadata mdadm: array /dev/md0 started. [root@hs105 Packages]# cd / [root@hs105 /]# cat /proc/mdstat Personalities : [raid1] md0 : active raid1 sdb[1] sdc[0] 31440768 blocks super 1.2 [2/2] [UU] [===>.................] resync= 16.4% (5166208/31440768) finish=2.1min speed=206648K/sec unused devices: <none>
格式化 RAID卷
[root@hs105 /]# mkfs -t ext4 /dev/md0 mke2fs 1.41.12 (17-May-2010) Filesystem label= OS type: Linux Block size=4096 (log=2) Fragment size=4096 (log=2) Stride=0 blocks, Stripe width=0 blocks 1966080 inodes, 7860192 blocks 393009 blocks (5.00%) reserved for thesuper user First data block=0 Maximum filesystem blocks=4294967296 240 block groups 32768 blocks per group, 32768 fragments pergroup 8192 inodes per group Superblock backups stored on blocks: 32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208, 4096000 Writing inode tables: done Creating journal (32768 blocks): done Writing superblocks and filesystemaccounting information: done This filesystem will be automaticallychecked every 29 mounts or 180 days, whichever comes first. Use tune2fs -c or -i to override.
將RAID卷掛載到 /DATA 目錄下
[root@hs105 /]# mount /dev/md0 /DATA
將文件寫入DATA下
[root@hs105 /]#cd DATA [root@hs105 DATA]# ll total 16 drwx------. 2 root root 16384 Aug 14 15:06lost+found [root@hs105 DATA]# touch 123.txt [root@hs105 DATA]# touch 456.txt [root@hs105 DATA]# touch 789.txt [root@hs105 DATA]# vi 123.txt [root@hs105 DATA]# cat 123.txt 12345678asfghrtyjuk T
模擬磁盤壞掉
可以看到此時連接虛擬機的的磁盤只有兩個
進入虛擬機
查看/DATA 目錄
發現原文件依然存在
查看系統日誌
[root@hs105 DATA]# tail -f/var/log/messages Aug 14 15:19:15 hs105 kernel: sd 2:0:1:0:[sdb] CDB: Read(10): 28 00 03 bf ff f8 00 00 0 8 00 Aug 14 15:19:15 hs105 kernel: Buffer I/Oerror on device sdb, logical block 7864319 Aug 14 15:19:15 hs105 kernel: sd 2:0:1:0:[sdb] Unhandled error code Aug 14 15:19:15 hs105 kernel: sd 2:0:1:0:[sdb] Result: hostbyte=DID_NO_CONNECT driverby te=DRIVER_OK Aug 14 15:19:15 hs105 kernel: sd 2:0:1:0:[sdb] CDB: Read(10): 28 00 03 bf ff f8 00 00 0 8 00 Aug 14 15:19:15 hs105 kernel: Buffer I/O erroron device sdb, logical block 7864319 Aug 14 15:19:15 hs105 kernel: sd 2:0:1:0:[sdb] Unhandled error code Aug 14 15:19:15 hs105 kernel: sd 2:0:1:0:[sdb] Result: hostbyte=DID_NO_CONNECT driverby te=DRIVER_OK Aug 14 15:19:15 hs105 kernel: sd 2:0:1:0:[sdb] CDB: Read(10): 28 00 00 00 00 00 00 00 0 8 00 Aug 14 15:19:15 hs105 kernel: Buffer I/Oerror on device sdb, logical block 0
接下來進行RAID1的Rebuild
查看raid卷狀態
[root@hs105 ~]# cat /proc/mdstat Personalities : [raid1] md127 : active (auto-read-only) raid1sdb[1] 31440768 blocks super 1.2 [2/1] [_U] unused devices: <none>
發現/dev/md0 自動更名爲md127
md127上存在sdb
於是我們將sdc格式化並
格式化操作參考之前的格式化RAID卷部分
接下來將sdc掛載到md127裏面
[root@hs105 DATA]# mdadm /dev/md127 -a/dev/sdc mdadm: added /dev/sdc 查看raid卷狀態 [root@hs105 DATA]# cat /proc/mdstat Personalities : [raid1] md127 : active raid1 sdb[2] sdc[1] 31438720 blocks super 1.2 [2/1] [_U] [=>...................] recovery = 7.0% (2201920/31438720) finish=2.4min speed=200174K/sec unused devices: <none>
查看/DATA
[root@hs105 DATA]# cd /DATA [root@hs105 DATA]# ll total 4 -rw-r--r--. 1 root root 23 Aug 14 15:48123.txt -rw-r--r--. 1 root root 0 Aug 14 15:47 456.txt -rw-r--r--. 1 root root 0 Aug 14 15:47 789.txt
