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Eitan
Asked: 2024-09-06 00:40:01 +0800 CST

重建 md raid5

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我有 linux ubuntu 11 (bullseye)，带有 raid5、3 个 2TB 磁盘，我想添加一个 2TB 磁盘。我按照手册操作，但在执行 umount 命令后，我丢失了阵列。

当执行 lsblk 时，我发现我没有安装数组，这对我来说是合乎逻辑的。lsblk 输出：

NAME               MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
sda                  8:0    0 238.5G  0 disk
├─sda1               8:1    0   512M  0 part /boot/efi
├─sda2               8:2    0   488M  0 part /boot
└─sda3               8:3    0 237.5G  0 part
  ├─SRV--vg-root   254:0    0 236.5G  0 lvm  /
  └─SRV--vg-swap_1 254:1    0   976M  0 lvm  [SWAP]
sdb                  8:16   0   1.8T  0 disk
└─sdb1               8:17   0   1.8T  0 part
sdc                  8:32   0   1.8T  0 disk
└─sdc1               8:33   0   1.8T  0 part
sdd                  8:48   0   1.8T  0 disk
sde                  8:64   0   1.8T  0 disk
└─sde1               8:65   0   1.8T  0 part

但是当我尝试使用本手册组装阵列时我执行以下命令：

 sudo mdadm --assemble --force /dev/md0 /dev/sdb /dev/sdc /dev/sde

并收到以下输出：

mdadm: Cannot assemble mbr metadata on /dev/sdb
mdadm: /dev/sdb has no superblock - assembly aborted

fdisk -l 输出为：

Disk /dev/sdc: 1.82 TiB, 2000398934016 bytes, 3907029168 sectors
Disk model: WDC WD20EZBX-00A
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: gpt
Disk identifier: 16BEE218-DD7C-11EE-8CF6-D8CB8A1409C0

Device     Start        End    Sectors  Size Type
/dev/sdc1   2048 3907028991 3907026944  1.8T Microsoft basic data


Disk /dev/sdb: 1.82 TiB, 2000398934016 bytes, 3907029168 sectors
Disk model: WDC WD20EZBX-22A
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: gpt
Disk identifier: 16B93AE7-DD7C-11EE-8CF6-D8CB8A1409C0

Device     Start        End    Sectors  Size Type
/dev/sdb1   2048 3907028991 3907026944  1.8T Microsoft basic data


Disk /dev/sdd: 1.82 TiB, 2000398934016 bytes, 3907029168 sectors
Disk model: WDC WD20EZBX-00A
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: gpt
Disk identifier: BF7FEEC8-7DCE-0A4D-85EA-0AA18AB0EBD7


Disk /dev/sde: 1.82 TiB, 2000398934016 bytes, 3907029168 sectors
Disk model: WDC WD20EZBX-22A
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: gpt
Disk identifier: 16C52C55-DD7C-11EE-8CF6-D8CB8A1409C0

Device     Start        End    Sectors  Size Type
/dev/sde1   2048 3907028991 3907026944  1.8T Microsoft basic data


Disk /dev/sda: 238.47 GiB, 256060514304 bytes, 500118192 sectors
Disk model: PLEXTOR PX-256M6
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: gpt
Disk identifier: 37957460-EE75-440F-AC0D-F3333B740269

Device       Start       End   Sectors   Size Type
/dev/sda1     2048   1050623   1048576   512M EFI System
/dev/sda2  1050624   2050047    999424   488M Linux filesystem
/dev/sda3  2050048 500117503 498067456 237.5G Linux LVM


Disk /dev/mapper/SRV--vg-root: 236.53 GiB, 253973495808 bytes, 496041984 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/mapper/SRV--vg-swap_1: 976 MiB, 1023410176 bytes, 1998848 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

据我所知，我毁了我的阵列。是这样吗？我怎样才能重新组装我的阵列而不丢失数据？ 是的，我已经备份了重要的东西，所以如果必须的话，我可以建立一个新阵列。

mdadm

1 个回答

  1. Best Answer

    我根据 DanielB 的评论解决了这个问题，但我丢失了数据……当我这样做的时候

    mdadm --assemble --force /dev/md0 /dev/sdb1 /dev/sdc1 /dev/sde1

    输出是设备正忙，所以我用谷歌搜索并发现我需要停止 md 阵列。从那里组装和重建阵列很容易。

    我不知道是什么毁了我的数据，但至少我对重要的东西进行了备份，这样我就可以恢复数据。

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