我安装了 Ubuntu 服务器 16（Linux 版本 4.4.0-38-generic（buildd@lgw01-58）（gcc 版本 5.4.0 20160609（Ubuntu 5.4.0-6ubuntu1~16.04.2））并选择在安装时使用三个磁盘（启动单独在第四个上）设置 RAID1 以将它们用作数据存储。
看来 RAID 没问题，但无法挂载。我不明白这是否是文件系统问题。安装时没有文件系统选项，它在 fdisk 下列为“HPFS/NTFS/exFAT”。指定其中任何一个都会在挂载时出现错误（尝试在“/scratch”处挂载）：
mount /dev/md0 /scratch
NTFS signature is missing.
Failed to mount '/dev/md0': Invalid argument
The device '/dev/md0' doesn't seem to have a valid NTFS.
Maybe the wrong device is used? Or the whole disk instead of a
partition (e.g. /dev/sda, not /dev/sda1)? Or the other way around?
以下是各种测试输出。感谢您的帮助。S.
cat /proc/mdstat
Personalities : [raid1] [linear] [multipath] [raid0] [raid6] [raid5] [raid4] [raid10]
md0 : active raid1 sdc1[1] sdb1[0] sdd1[2]
1953381376 blocks super 1.2 [3/3] [UUU]
bitmap: 0/15 pages [0KB], 65536KB chunk
mdadm --detail --scan
ARRAY /dev/md0 metadata=1.2 name=10-115-66-42:0 UUID=a44eb3e4:20bee35e:2c6c6819:e4a4ed83
dmsetup ls
10--115--66--42--vg-root (252:0)
10--115--66--42--vg-swap_1 (252:1)
dmsetup table
10--115--66--42--vg-root: 0 1902182400 linear 8:5 2048
10--115--66--42--vg-swap_1: 0 50331648 linear 8:5 1902184448
file -s -L /dev/mapper/*
/dev/mapper/10--115--66--42--vg-root: Linux rev 1.0 ext4 filesystem data, UUID=750c998b-8c36-4f5f-84de-cbe07fb4794c (needs journal recovery) (extents) (large files) (huge files)
/dev/mapper/10--115--66--42--vg-swap_1: Linux/i386 swap file (new style), version 1 (4K pages), size 6291455 pages, no label, UUID=8ed911a4-0069-493a-bc02-8945b41fbc18
/dev/mapper/control: ERROR: cannot read `/dev/mapper/control' (Invalid argument)
fdisk -l /dev/sd*
Disk /dev/sda: 931.5 GiB, 1000204886016 bytes, 1953525168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x6ab41cea
Device Boot Start End Sectors Size Id Type
/dev/sda1 * 2048 999423 997376 487M 83 Linux
/dev/sda2 1001470 1953523711 1952522242 931G 5 Extended
/dev/sda5 1001472 1953523711 1952522240 931G 8e Linux LVM
Disk /dev/sda1: 487 MiB, 510656512 bytes, 997376 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk /dev/sda2: 1 KiB, 1024 bytes, 2 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x00016824
Device Boot Start End Sectors Size Id Type
/dev/sda2p1 2 1952522241 1952522240 931G 8e Linux LVM
Disk /dev/sda5: 931 GiB, 999691386880 bytes, 1952522240 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk /dev/sdb: 1.8 TiB, 2000398934016 bytes, 3907029168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x57d341ca
Device Boot Start End Sectors Size Id Type
/dev/sdb1 2048 3907026943 3907024896 1.8T 7 HPFS/NTFS/exFAT
Disk /dev/sdb1: 1.8 TiB, 2000396746752 bytes, 3907024896 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x00000000
Device Boot Start End Sectors Size Id Type
/dev/sdb1p1 4294967295 8589934589 4294967295 2T ff BBT
/dev/sdb1p2 4294967295 8589934589 4294967295 2T ff BBT
/dev/sdb1p3 4294967295 8589934589 4294967295 2T ff BBT
/dev/sdb1p4 4294967295 5035196669 740229375 353G ff BBT
Disk /dev/sdc: 1.8 TiB, 2000398934016 bytes, 3907029168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x57d341cc
Device Boot Start End Sectors Size Id Type
/dev/sdc1 2048 3907026943 3907024896 1.8T 7 HPFS/NTFS/exFAT
Disk /dev/sdc1: 1.8 TiB, 2000396746752 bytes, 3907024896 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x00000000
Device Boot Start End Sectors Size Id Type
/dev/sdc1p1 4294967295 8589934589 4294967295 2T ff BBT
/dev/sdc1p2 4294967295 8589934589 4294967295 2T ff BBT
/dev/sdc1p3 4294967295 8589934589 4294967295 2T ff BBT
/dev/sdc1p4 4294967295 5035196669 740229375 353G ff BBT
Disk /dev/sdd: 1.8 TiB, 2000398934016 bytes, 3907029168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x57d341cd
Device Boot Start End Sectors Size Id Type
/dev/sdd1 2048 3907026943 3907024896 1.8T 7 HPFS/NTFS/exFAT
Disk /dev/sdd1: 1.8 TiB, 2000396746752 bytes, 3907024896 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x00000000
Device Boot Start End Sectors Size Id Type
/dev/sdd1p1 4294967295 8589934589 4294967295 2T ff BBT
/dev/sdd1p2 4294967295 8589934589 4294967295 2T ff BBT
/dev/sdd1p3 4294967295 8589934589 4294967295 2T ff BBT
/dev/sdd1p4 4294967295 5035196669 740229375 353G ff BBT
root@10-115-66-42:/home/theoa# mount -t hpfs /dev/md0 /scratch
mount: wrong fs type, bad option, bad superblock on /dev/md0,
missing codepage or helper program, or other error