linux软raid练习

时间：2016-08-05 22:55:39 阅读：308 评论：0 收藏：0 [点我收藏+]
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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；
[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)
来自为知笔记(Wiz)
linux软raid练习
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原文地址：http://www.cnblogs.com/Saviorsyang/p/5742921.html
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