linux軟raid練習

建立一個空間大小爲10G的raid5，要求其chunk爲1024k，格式爲ext4文件系統，開機可自動掛載至/backup目錄，並支持acl功能；

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206

[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)

來自爲知筆記(Wiz)