创建一个空间大小为10G的raid5，要求其chunk为1024k，格式为ext4文件系统，开机可自动挂载至/backup目录，并支持acl功能；

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[root@mail ~] # fdisk /dev/sdc   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): n Command action     e   extended     p   primary partition (1-4) p Partition number (1-4): 1 First cylinder (1-2610, default 1): Using default value 1 Last cylinder, +cylinders or +size{K,M,G} (1-2610, default 2610): +5G   Command (m for help): n Command action     e   extended     p   primary partition (1-4) p Partition number (1-4): 2 First cylinder (655-2610, default 655): Using default value 655 Last cylinder, +cylinders or +size{K,M,G} (655-2610, default 2610): +5G   Command (m for help): n Command action     e   extended     p   primary partition (1-4) p Partition number (1-4): 3 First cylinder (1309-2610, default 1309): Using default value 1309 Last cylinder, +cylinders or +size{K,M,G} (1309-2610, default 2610): +5G   Command (m for help): t Partition number (1-4): 1 Hex code ( type L to list codes): fd Changed system type of partition 1 to fd (Linux raid autodetect)   Command (m for help): t Partition number (1-4): 2 Hex code ( type L to list codes): fd Changed system type of partition 2 to fd (Linux raid autodetect)   Command (m for help): t Partition number (1-4): 3 Hex code ( type L to list codes): fd Changed system type of partition 3 to fd (Linux raid autodetect)   Command (m for help): w The partition table has been altered!   Calling ioctl() to re- read partition table.   WARNING: Re-reading the partition table failed with error 16: Device or resource busy. The kernel still uses the old table. The new table will be used at the next reboot or after you run partprobe(8) or kpartx(8) Syncing disks. [root@mail ~] # partprobe /dev/sdc [root@mail ~] # cat /proc/partitions major minor  #blocks  name       8        0   52428800 sda     8        1     512000 sda1     8        2   51915776 sda2     8       16  524288000 sdb     8       17  524281243 sdb1     8       32   20971520 sdc     8       33    5253223 sdc1     8       34    5253255 sdc2     8       35    5253255 sdc3     8       48   20971520 sdd     8       49    2104483 sdd1     8       50    2104515 sdd2     8       51    2104515 sdd3    11        0    3763200 sr0   252        0   47816704 dm-0   252        1    4096000 dm-1     9        2    2102400 md2   [root@mail ~] # mdadm -C /dev/md5 -a yes -l 5 -n 3 -c 1024 /dev/sdc{1,2,3} mdadm: /dev/sdc1 appears to be part of a raid array:         level=raid0 devices=2 ctime=Tue May 10 20:19:43 2016 Continue creating array? yes mdadm: Defaulting to version 1.2 metadata mdadm: array /dev/md5 started. [root@mail ~] # mdadm -D /dev/md5 /dev/md5 :          Version : 1.2    Creation Time : Wed May 11 09:20:55 2016       Raid Level : raid5       Array Size : 10498048 (10.01 GiB 10.75 GB)    Used Dev Size : 5249024 (5.01 GiB 5.38 GB)     Raid Devices : 3    Total Devices : 3      Persistence : Superblock is persistent        Update Time : Wed May 11 09:21:08 2016            State : clean, degraded, recovering   Active Devices : 2 Working Devices : 3   Failed Devices : 0    Spare Devices : 1             Layout : left-symmetric       Chunk Size : 1024K     Rebuild Status : 52% complete               Name : mail.saviorsyang.com:5  ( local to host mail.saviorsyang.com)             UUID : af628086:b4a74844:bd49e03d:5dae3968           Events : 9        Number   Major   Minor   RaidDevice State         0       8       33        0      active sync   /dev/sdc1         1       8       34        1      active sync   /dev/sdc2         3       8       35        2      spare rebuilding   /dev/sdc3 [root@mail ~] # mdadm -D /dev/md5 /dev/md5 :          Version : 1.2    Creation Time : Wed May 11 09:20:55 2016       Raid Level : raid5       Array Size : 10498048 (10.01 GiB 10.75 GB)    Used Dev Size : 5249024 (5.01 GiB 5.38 GB)     Raid Devices : 3    Total Devices : 3      Persistence : Superblock is persistent        Update Time : Wed May 11 09:21:22 2016            State : clean   Active Devices : 3 Working Devices : 3   Failed Devices : 0    Spare Devices : 0             Layout : left-symmetric       Chunk Size : 1024K               Name : mail.saviorsyang.com:5  ( local to host mail.saviorsyang.com)             UUID : af628086:b4a74844:bd49e03d:5dae3968           Events : 22        Number   Major   Minor   RaidDevice State         0       8       33        0      active sync   /dev/sdc1         1       8       34        1      active sync   /dev/sdc2         3       8       35        2      active sync   /dev/sdc3 [root@mail ~] # mkdir /backup [root@mail ~] # mke2fs -t ext4 /dev/md5 mke2fs 1.43-WIP (20-Jun-2013) Filesystem label= OS type : Linux Block size=4096 (log=2) Fragment size=4096 (log=2) Stride=256 blocks, Stripe width=512 blocks 657072 inodes, 2624512 blocks 131225 blocks (5.00%) reserved for the super user First data block=0 Maximum filesystem blocks=2688548864 81 block groups 32768 blocks per group, 32768 fragments per group 8112 inodes per group Superblock backups stored on blocks:      32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632   Allocating group tables: done                            Writing inode tables: done                            Creating journal (32768 blocks): done Writing superblocks and filesystem accounting information: done   [root@mail ~] # echo '/dev/md5  /backup  ext4  defaults,acl 1 '  >> /etc/fstab [root@mail ~] # cat /etc/fstab   # # /etc/fstab # Created by anaconda on Wed Apr 27 00:43:47 2016 # # Accessible filesystems, by reference, are maintained under '/dev/disk' # See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info # /dev/mapper/vg_demo-lv_root /                       ext4    defaults        1 1      1 2    1 4 /dev/mapper/vg_demo-lv_swap swap                    swap    defaults        0 0 /dev/cdrom      /mnt            iso9660 defaults        1 3 tmpfs                   /dev/shm                tmpfs   defaults        0 0 devpts                  /dev/pts                devpts  gid=5,mode=620  0 0 sysfs                   /sys                    sysfs   defaults        0 0 proc                    /proc                   proc    defaults        0 0 /dev/md5  /backup  ext4  defaults,acl 1   [root@mail ~] # mount -a [root@mail ~] # mount /dev/mapper/vg_demo-lv_root on / type ext4 (rw) proc on /proc type proc (rw) sysfs on /sys type sysfs (rw) devpts on /dev/pts type devpts (rw,gid=5,mode=620) tmpfs on /dev/shm type tmpfs (rw) /dev/sda1 on /boot type ext4 (rw) /dev/sdb1 on /student type ext4 (rw) /dev/sr0 on /mnt type iso9660 (ro) none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw) /dev/md2 on /media type ext4 (rw) /dev/md5 on /backup type ext4 (rw,acl)