背景：从 ubuntu 16.04 升级到 18.04 后出现此问题。我的 /home 分区位于我的 Ubunutu 16.04 上，是 3 个磁盘的 raid 5 分区，使用 lvm2 进行管理。我完全没有遇到任何问题。使用命令“do-release-upgrade”从 Ubuntu 16.04 升级到 18.04 后，第一次重启失败。我发送了有关此问题的第一条消息： 升级 16.04 -> 18.04 后出现问题 - 设备映射器？ 现在，我对麻烦的理解更加清晰了。
实际上，我已通过编辑 /etc/fstab 和注释 /home 的挂载点来停用 raid 磁盘。因此，现在我在 Ubuntu 18.04 下有一个启动服务器，但没有任何来自 raid 磁盘的数据。
所以现在，我尝试恢复之前在 RAID 5 中使用的 3 个磁盘上的数据。
所以现在，我尝试：
root@xxx:~# dmraid -s
*** Group superset isw_eaabdhefe
--> Subset
name : isw_eaabdhefe_raid5
size : 7814048256
stride : 256
type : raid5_la
status : ok
subsets: 0
devs : 3
spares : 0
root@xxx:~# dmraid -r
/dev/sdc: isw, "isw_eaabdhefe", GROUP, ok, 3907029166 sectors, data@ 0
/dev/sde: isw, "isw_eaabdhefe", GROUP, ok, 3907029166 sectors, data@ 0
/dev/sdd: isw, "isw_eaabdhefe", GROUP, ok, 3907029166 sectors, data@ 0
root@xxx:~#
因此，根据大多数文档，我准备使用以下命令激活突袭组：
root@xxx:~# dmraid -ay
RAID set "isw_eaabdhefe_raid5" was not activated
root@xxx:~#
更确切
root@xxx:~# dmraid -tay
isw_eaabdhefe_raid5: 0 7814048256 raid raid5_la 4 256 nosync region_size 131072 3 - /dev/sdc - /dev/sdd - /dev/sde
root@xxx:~#
每次我尝试激活时，dmesg 中都会出现以下几行：
[xxx] device-mapper: table: 253:0: raid: RAID device lookup failure
[xxx] device-mapper: ioctl: error adding target to table
我也尝试过：
root@xxx:~# dmraid -ay -vvv -d
WARN: locking /var/lock/dmraid/.lock
NOTICE: /dev/sda: asr discovering
NOTICE: /dev/sda: ddf1 discovering
NOTICE: /dev/sda: hpt37x discovering
NOTICE: /dev/sda: hpt45x discovering
NOTICE: /dev/sda: isw discovering
DEBUG: not isw at 180045765632
DEBUG: isw trying hard coded -2115 offset.
DEBUG: not isw at 180044683776
NOTICE: /dev/sda: jmicron discovering
NOTICE: /dev/sda: lsi discovering
NOTICE: /dev/sda: nvidia discovering
NOTICE: /dev/sda: pdc discovering
NOTICE: /dev/sda: sil discovering
NOTICE: /dev/sda: via discovering
NOTICE: /dev/sdc: asr discovering
NOTICE: /dev/sdc: ddf1 discovering
NOTICE: /dev/sdc: hpt37x discovering
NOTICE: /dev/sdc: hpt45x discovering
NOTICE: /dev/sdc: isw discovering
DEBUG: isw metadata found at 2000398932992 from probe at 2000398932992
NOTICE: /dev/sdc: isw metadata discovered
NOTICE: /dev/sdc: jmicron discovering
NOTICE: /dev/sdc: lsi discovering
NOTICE: /dev/sdc: nvidia discovering
NOTICE: /dev/sdc: pdc discovering
NOTICE: /dev/sdc: sil discovering
NOTICE: /dev/sdc: via discovering
NOTICE: /dev/sde: asr discovering
NOTICE: /dev/sde: ddf1 discovering
NOTICE: /dev/sde: hpt37x discovering
NOTICE: /dev/sde: hpt45x discovering
NOTICE: /dev/sde: isw discovering
DEBUG: isw metadata found at 2000398932992 from probe at 2000398932992
NOTICE: /dev/sde: isw metadata discovered
NOTICE: /dev/sde: jmicron discovering
NOTICE: /dev/sde: lsi discovering
NOTICE: /dev/sde: nvidia discovering
NOTICE: /dev/sde: pdc discovering
NOTICE: /dev/sde: sil discovering
NOTICE: /dev/sde: via discovering
NOTICE: /dev/sdb: asr discovering
NOTICE: /dev/sdb: ddf1 discovering
NOTICE: /dev/sdb: hpt37x discovering
NOTICE: /dev/sdb: hpt45x discovering
NOTICE: /dev/sdb: isw discovering
DEBUG: not isw at 160041884672
DEBUG: isw trying hard coded -2115 offset.
DEBUG: not isw at 160040802816
NOTICE: /dev/sdb: jmicron discovering
NOTICE: /dev/sdb: lsi discovering
NOTICE: /dev/sdb: nvidia discovering
NOTICE: /dev/sdb: pdc discovering
NOTICE: /dev/sdb: sil discovering
NOTICE: /dev/sdb: via discovering
NOTICE: /dev/sdd: asr discovering
NOTICE: /dev/sdd: ddf1 discovering
NOTICE: /dev/sdd: hpt37x discovering
NOTICE: /dev/sdd: hpt45x discovering
NOTICE: /dev/sdd: isw discovering
DEBUG: isw metadata found at 2000398932992 from probe at 2000398932992
NOTICE: /dev/sdd: isw metadata discovered
NOTICE: /dev/sdd: jmicron discovering
NOTICE: /dev/sdd: lsi discovering
NOTICE: /dev/sdd: nvidia discovering
NOTICE: /dev/sdd: pdc discovering
NOTICE: /dev/sdd: sil discovering
NOTICE: /dev/sdd: via discovering
DEBUG: _find_set: searching isw_eaabdhefe
DEBUG: _find_set: not found isw_eaabdhefe
DEBUG: _find_set: searching isw_eaabdhefe_raid5
DEBUG: _find_set: searching isw_eaabdhefe_raid5
DEBUG: _find_set: not found isw_eaabdhefe_raid5
DEBUG: _find_set: not found isw_eaabdhefe_raid5
NOTICE: added /dev/sdc to RAID set "isw_eaabdhefe"
DEBUG: _find_set: searching isw_eaabdhefe
DEBUG: _find_set: found isw_eaabdhefe
DEBUG: _find_set: searching isw_eaabdhefe_raid5
DEBUG: _find_set: searching isw_eaabdhefe_raid5
DEBUG: _find_set: found isw_eaabdhefe_raid5
DEBUG: _find_set: found isw_eaabdhefe_raid5
NOTICE: added /dev/sde to RAID set "isw_eaabdhefe"
DEBUG: _find_set: searching isw_eaabdhefe
DEBUG: _find_set: found isw_eaabdhefe
DEBUG: _find_set: searching isw_eaabdhefe_raid5
DEBUG: _find_set: searching isw_eaabdhefe_raid5
DEBUG: _find_set: found isw_eaabdhefe_raid5
DEBUG: _find_set: found isw_eaabdhefe_raid5
NOTICE: added /dev/sdd to RAID set "isw_eaabdhefe"
DEBUG: set status of set "isw_eaabdhefe_raid5" to 16
DEBUG: dm_raid: low level dev /dev/sdc
DEBUG: dm_raid: low level dev /dev/sdd
DEBUG: dm_raid: low level dev /dev/sde
RAID set "isw_eaabdhefe_raid5" was not activated
INFO: Activating GROUP raid set "isw_eaabdhefe"
WARN: unlocking /var/lock/dmraid/.lock
DEBUG: freeing devices of RAID set "isw_eaabdhefe_raid5"
DEBUG: freeing device "isw_eaabdhefe_raid5", path "/dev/sdc"
DEBUG: freeing device "isw_eaabdhefe_raid5", path "/dev/sdd"
DEBUG: freeing device "isw_eaabdhefe_raid5", path "/dev/sde"
DEBUG: freeing devices of RAID set "isw_eaabdhefe"
DEBUG: freeing device "isw_eaabdhefe", path "/dev/sdc"
DEBUG: freeing device "isw_eaabdhefe", path "/dev/sdd"
DEBUG: freeing device "isw_eaabdhefe", path "/dev/sde"
root@xxx:~#
有人能帮助我理解这些话吗？
更多信息 ：
root@xxx:~# lspci
00:00.0 Host bridge: Intel Corporation Xeon E3-1200 v2/Ivy Bridge DRAM Controller (rev 09)
00:01.0 PCI bridge: Intel Corporation Xeon E3-1200 v2/3rd Gen Core processor PCI Express Root Port (rev 09)
00:01.1 PCI bridge: Intel Corporation Xeon E3-1200 v2/3rd Gen Core processor PCI Express Root Port (rev 09)
00:01.2 PCI bridge: Intel Corporation Xeon E3-1200 v2/3rd Gen Core processor PCI Express Root Port (rev 09)
00:19.0 Ethernet controller: Intel Corporation 82579LM Gigabit Network Connection (Lewisville) (rev 05)
00:1a.0 USB controller: Intel Corporation 6 Series/C200 Series Chipset Family USB Enhanced Host Controller #2 (rev 05)
00:1c.0 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 1 (rev b5)
00:1c.4 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 5 (rev b5)
00:1c.5 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 6 (rev b5)
00:1d.0 USB controller: Intel Corporation 6 Series/C200 Series Chipset Family USB Enhanced Host Controller #1 (rev 05)
00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev a5)
00:1f.0 ISA bridge: Intel Corporation C204 Chipset LPC Controller (rev 05)
00:1f.2 RAID bus controller: Intel Corporation SATA Controller [RAID mode] (rev 05)
00:1f.3 SMBus: Intel Corporation 6 Series/C200 Series Chipset Family SMBus Controller (rev 05)
02:00.0 Ethernet controller: Intel Corporation 82574L Gigabit Network Connection
05:00.0 Ethernet controller: Intel Corporation 82574L Gigabit Network Connection
06:00.0 VGA compatible controller: Matrox Electronics Systems Ltd. MGA G200e [Pilot] ServerEngines (SEP1) (rev 07)
root@xxx:~#
root@xxx:~# ls -al /dev/mapper/
total 0
drwxr-xr-x 2 root root 60 avril 1 12:30 .
drwxr-xr-x 22 root root 4340 avril 1 17:33 ..
crw------- 1 root root 10, 236 avril 1 12:30 control
root@xxx:~#
root@xxx:~# cat /proc/partitions
major minor #blocks name
8 0 175825944 sda
8 1 975872 sda1
8 2 174848000 sda2
8 16 156290904 sdb
8 17 31249408 sdb1
8 18 9765888 sdb2
8 19 2097152 sdb3
8 20 113176576 sdb4
8 64 1953514584 sde
8 32 1953514584 sdc
8 48 1953514584 sdd
9 126 3907023872 md126
root@xxx:~#
root@xxx:~# dmraid -V
dmraid version: 1.0.0.rc16 (2009.09.16) shared
dmraid library version: 1.0.0.rc16 (2009.09.16)
device-mapper version: 4.37.0
root@xxx:~#
root@xxx:~# uname -a
Linux xxx 4.15.0-91-generic #92-Ubuntu SMP Fri Feb 28 11:09:48 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
root@xxx:~#
sdc、sdd、sde 是用于 raid 卷的磁盘。
我可以发送更多信息，只需请求即可。