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Martin Hope
zxdawn
Asked: 2018-09-08 00:53:25 +0800 CST
  • 0

我正在尝试从四个磁盘创建 raid 5：

Disk /dev/sdc: 8001.6 GB, 8001563222016 bytes
/dev/sdc1            2048  4294967294  2147482623+  fd  Linux raid autodetect
Disk /dev/sdb: 8001.6 GB, 8001563222016 bytes
/dev/sdb1            2048  4294967294  2147482623+  fd  Linux raid autodetect
Disk /dev/sdd: 24003.1 GB, 24003062267904 bytes
/dev/sdd1            2048  4294967294  2147482623+  fd  Linux raid autodetect
Disk /dev/sde: 8001.6 GB, 8001563222016 bytes
/dev/sde1            2048  4294967294  2147482623+  fd  Linux raid autodetect

但是，创建后我只有 6T 空间（我的一个磁盘）：

/dev/md0         ext4   6.0T  184M  5.7T   1% /mnt/raid5

这是我创建过程的其他信息：

结果mdadm -E /dev/sd[b-e]1：

/dev/sdb1:
          Magic : a92b4efc
        Version : 1.2
    Feature Map : 0x0
     Array UUID : 8953b4f1:61212c46:b0a63144:25eb4a7d
           Name : node7:0  (local to host node7)
  Creation Time : Fri Sep  7 09:16:42 2018
     Raid Level : raid5
   Raid Devices : 4

 Avail Dev Size : 4294703103 (2047.87 GiB 2198.89 GB)
     Array Size : 6442053120 (6143.62 GiB 6596.66 GB)
  Used Dev Size : 4294702080 (2047.87 GiB 2198.89 GB)
    Data Offset : 262144 sectors
   Super Offset : 8 sectors
          State : clean
    Device UUID : 2fcb3346:9ed69eab:64c6f851:0bcc39c4

    Update Time : Fri Sep  7 13:17:38 2018
       Checksum : c701ff7e - correct
         Events : 18

         Layout : left-symmetric
     Chunk Size : 512K

   Device Role : Active device 0
   Array State : AAAA ('A' == active, '.' == missing)
/dev/sdc1:
          Magic : a92b4efc
        Version : 1.2
    Feature Map : 0x0
     Array UUID : 8953b4f1:61212c46:b0a63144:25eb4a7d
           Name : node7:0  (local to host node7)
  Creation Time : Fri Sep  7 09:16:42 2018
     Raid Level : raid5
   Raid Devices : 4

 Avail Dev Size : 4294703103 (2047.87 GiB 2198.89 GB)
     Array Size : 6442053120 (6143.62 GiB 6596.66 GB)
  Used Dev Size : 4294702080 (2047.87 GiB 2198.89 GB)
    Data Offset : 262144 sectors
   Super Offset : 8 sectors
          State : clean
    Device UUID : 6f13c9f0:de2d4c6f:cbac6b87:67bc483e

    Update Time : Fri Sep  7 13:17:38 2018
       Checksum : e4c675c2 - correct
         Events : 18

         Layout : left-symmetric
     Chunk Size : 512K

   Device Role : Active device 1
   Array State : AAAA ('A' == active, '.' == missing)
/dev/sdd1:
          Magic : a92b4efc
        Version : 1.2
    Feature Map : 0x0
     Array UUID : 8953b4f1:61212c46:b0a63144:25eb4a7d
           Name : node7:0  (local to host node7)
  Creation Time : Fri Sep  7 09:16:42 2018
     Raid Level : raid5
   Raid Devices : 4

 Avail Dev Size : 4294703103 (2047.87 GiB 2198.89 GB)
     Array Size : 6442053120 (6143.62 GiB 6596.66 GB)
  Used Dev Size : 4294702080 (2047.87 GiB 2198.89 GB)
    Data Offset : 262144 sectors
   Super Offset : 8 sectors
          State : clean
    Device UUID : 4dab38e6:94c5052b:06d6b6b0:34a41472

    Update Time : Fri Sep  7 13:17:38 2018
       Checksum : f306b65f - correct
         Events : 18

         Layout : left-symmetric
     Chunk Size : 512K

   Device Role : Active device 2
   Array State : AAAA ('A' == active, '.' == missing)
/dev/sde1:
          Magic : a92b4efc
        Version : 1.2
    Feature Map : 0x0
     Array UUID : 8953b4f1:61212c46:b0a63144:25eb4a7d
           Name : node7:0  (local to host node7)
  Creation Time : Fri Sep  7 09:16:42 2018
     Raid Level : raid5
   Raid Devices : 4

 Avail Dev Size : 4294703103 (2047.87 GiB 2198.89 GB)
     Array Size : 6442053120 (6143.62 GiB 6596.66 GB)
  Used Dev Size : 4294702080 (2047.87 GiB 2198.89 GB)
    Data Offset : 262144 sectors
   Super Offset : 8 sectors
          State : clean
    Device UUID : b04d152e:0448fe56:3b22a2d6:b2504d26

    Update Time : Fri Sep  7 13:17:38 2018
       Checksum : 40ffd3e7 - correct
         Events : 18

         Layout : left-symmetric
     Chunk Size : 512K

   Device Role : Active device 3
   Array State : AAAA ('A' == active, '.' == missing)

结果mdadm --detail /dev/md0：

/dev/md0:
        Version : 1.2
  Creation Time : Fri Sep  7 09:16:42 2018
     Raid Level : raid5
     Array Size : 6442053120 (6143.62 GiB 6596.66 GB)
  Used Dev Size : 2147351040 (2047.87 GiB 2198.89 GB)
   Raid Devices : 4
  Total Devices : 4
    Persistence : Superblock is persistent

    Update Time : Fri Sep  7 13:17:38 2018
          State : clean 
 Active Devices : 4
Working Devices : 4
 Failed Devices : 0
  Spare Devices : 0

         Layout : left-symmetric
     Chunk Size : 512K

           Name : node7:0  (local to host node7)
           UUID : 8953b4f1:61212c46:b0a63144:25eb4a7d
         Events : 18

    Number   Major   Minor   RaidDevice State
       0       8       17        0      active sync   /dev/sdb1
       1       8       33        1      active sync   /dev/sdc1
       2       8       49        2      active sync   /dev/sdd1
       4       8       65        3      active sync   /dev/sde1

结果mkfs.ext4 /dev/md0

mke2fs 1.41.9 (22-Aug-2009)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
402628608 inodes, 1610513280 blocks
80525664 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=4294967296
49149 block groups
32768 blocks per group, 32768 fragments per group
8192 inodes per group
Superblock backups stored on blocks: 
    32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208, 
    4096000, 7962624, 11239424, 20480000, 23887872, 71663616, 78675968, 
    102400000, 214990848, 512000000, 550731776, 644972544

Writing inode tables: done                            
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: 
done

This filesystem will be automatically checked every 37 mounts or
180 days, whichever comes first.  Use tune2fs -c or -i to override.

然后mkdir /mnt/raid5和mount /dev/md0 /mnt/raid5/。

linux software-raid
Martin Hope
zxdawn
Asked: 2018-09-07 17:07:18 +0800 CST
  • 1

我正在尝试根据本教程创建 RAID 5 。但是，当我运行时mdadm -C /dev/md0 -l=5 -n=4 /dev/sd[b-e]1，我收到此错误：

mdadm: invalid raid level: =5

这是输出mdadm -E /dev/sd[b-e]：

/dev/sdb:
   MBR Magic : aa55
Partition[0] :   4294965247 sectors at         2048 (type fd)
/dev/sdc:
   MBR Magic : aa55
Partition[0] :   4294965247 sectors at         2048 (type fd)
/dev/sdd:
   MBR Magic : aa55
Partition[0] :   4294965247 sectors at         2048 (type fd)
/dev/sde:
   MBR Magic : aa55
Partition[0] :   4294965247 sectors at         2048 (type fd)

这是输出mdadm --examine /dev/sdb1 /dev/sdc1 /dev/sdd1 /dev/sde1：

mdadm: No md superblock detected on /dev/sdb1.
mdadm: No md superblock detected on /dev/sdc1.
mdadm: No md superblock detected on /dev/sdd1.
mdadm: No md superblock detected on /dev/sde1.

这是输出fdisk -l | grep sd：

Disk /dev/sda: 300.0 GB, 300000000000 bytes
/dev/sda1   *        2048      626687      312320   83  Linux
/dev/sda2          626688    34187263    16780288   82  Linux swap / Solaris
/dev/sda3        34187264   139059199    52435968   83  Linux
/dev/sda4       139059200   585936895   223438848   83  Linux
Disk /dev/sdc: 8001.6 GB, 8001563222016 bytes
/dev/sdc1            2048  4294967294  2147482623+  fd  Linux raid autodetect
Disk /dev/sdb: 8001.6 GB, 8001563222016 bytes
/dev/sdb1            2048  4294967294  2147482623+  fd  Linux raid autodetect
Disk /dev/sdd: 24003.1 GB, 24003062267904 bytes
/dev/sdd1            2048  4294967294  2147482623+  fd  Linux raid autodetect
Disk /dev/sde: 8001.6 GB, 8001563222016 bytes
/dev/sde1            2048  4294967294  2147482623+  fd  Linux raid autodetect

sda是系统空间，我想用别人来存储数据。

linux raid