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MDADM 阵列限制为 2.0TB

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MDADM 阵列限制为 2.0TB

我有一个 MDADM 阵列，其中有四个 1TB 磁盘，采用 RAID5 配置。以下是相关部分mdadm --detail /dev/md1：

        Version : 00.90
     Raid Level : raid5
     Array Size : 2929537920 (2793.83 GiB 2999.85 GB)
  Used Dev Size : 976512640 (931.28 GiB 999.95 GB)
   Raid Devices : 4
  Total Devices : 4
Preferred Minor : 1
    Persistence : Superblock is persistent

它显示该阵列为 2.8TB。如下fdisk -l /dev/md1：

Disk /dev/md1: 2999.8 GB, 2999846830080 bytes
2 heads, 4 sectors/track, 732384480 cylinders
Units = cylinders of 8 * 512 = 4096 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 65536 bytes / 196608 bytes
Disk identifier: 0xffffffff
Disk /dev/md1 doesn't contain a valid partition table

fdisk 也显示为 3TB。但是，df -Th不同意：

Filesystem    Type    Size  Used Avail Use% Mounted on
/dev/md1      ext3    1.8T  1.8T     0 100% /

为什么全部显示/dev/md13TB但空间却限制为2TB？

其他详细信息：Ubuntu 10.10

更新：

$ tune2fs -l /dev/md1：

tune2fs 1.41.12 (17-May-2010)
Filesystem volume name:   <none>
Last mounted on:          <not available>
Filesystem UUID:          1b4e9420-61ee-4ffd-817a-28831f2aeaf2
Filesystem magic number:  0xEF53
Filesystem revision #:    1 (dynamic)
Filesystem features:      has_journal ext_attr resize_inode dir_index filetype needs_recovery sparse_super large_file
Filesystem flags:         signed_directory_hash
Default mount options:    (none)
Filesystem state:         clean
Errors behavior:          Continue
Filesystem OS type:       Linux
Inode count:              122068992
Block count:              488255968
Reserved block count:     24412798
Free blocks:              69746292
Free inodes:              121882953
First block:              0
Block size:               4096
Fragment size:            4096
Reserved GDT blocks:      907
Blocks per group:         32768
Fragments per group:      32768
Inodes per group:         8192
Inode blocks per group:   512
RAID stride:              16
RAID stripe width:        32
Filesystem created:       Sun Oct 17 01:14:23 2010
Last mount time:          Mon Dec  6 01:24:31 2010
Last write time:          Mon Dec  6 00:45:41 2010
Mount count:              12
Maximum mount count:      23
Last checked:             Sun Dec  5 20:37:35 2010
Check interval:           15552000 (6 months)
Next check after:         Fri Jun  3 21:37:35 2011
Reserved blocks uid:      0 (user root)
Reserved blocks gid:      0 (group root)
First inode:              11
Inode size:               256
Required extra isize:     28
Desired extra isize:      28
Journal inode:            8
First orphan inode:       55550208
Default directory hash:   half_md4
Directory Hash Seed:      2a386fcb-b24f-4f40-bf4c-7c03489b086c
Journal backup:           inode blocks

答案1

创建文件系统后是否添加了第 4 个驱动器？这可能会导致 FS 小于底层设备。

或者，也许你的 ext3 有 1k 个块，因为这会导致 2TB 的文件系统大小限制（ext3 大小限制）。

请发布“sudo tune2fs -l /dev/md1”的输出，并仔细查看块大小行。

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