1、故障描述（ 在线移除一块被设置为pv格式的硬盘，提示unknown device报道）：
/dev/sdb1 /dev/sdc1 /dev/sdd1是组成/dev/vg_test/lvm_test的PV，这里我们模拟/dev/sdd1硬盘被直接断电了
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[root@docker mnt]
# pvdisplay
/dev/sdd
:
read
failed after 0 of 4096 at 0: Input
/output
error
/dev/sdd
:
read
failed after 0 of 4096 at 21474770944: Input
/output
error
/dev/sdd
:
read
failed after 0 of 4096 at 21474828288: Input
/output
error
/dev/sdd
:
read
failed after 0 of 4096 at 4096: Input
/output
error
/dev/sdd1
:
read
failed after 0 of 512 at 21467824128: Input
/output
error
/dev/sdd1
:
read
failed after 0 of 512 at 21467938816: Input
/output
error
/dev/sdd1
:
read
failed after 0 of 512 at 0: Input
/output
error
/dev/sdd1
:
read
failed after 0 of 512 at 4096: Input
/output
error
/dev/sdd1
:
read
failed after 0 of 2048 at 0: Input
/output
error
Couldn't
find
device with uuid 166hLZ-2POl-GIsv-ELGh-8YVT-Zcoa-ZcLXzp.
--- Physical volume ---
PV Name
/dev/sdb1
VG Name vg_test
PV Size 19.99 GiB / not usable 1.43 MiB
Allocatable
yes
(but full)
PE Size 4.00 MiB
Total PE 5118
Free PE 0
Allocated PE 5118
PV UUID fuQdIY-qkJw-fZJB-AauO-Zqpj-91RI-S1GG0X
--- Physical volume ---
PV Name
/dev/sdc1
VG Name vg_test
PV Size 19.99 GiB / not usable 1.43 MiB
Allocatable
yes
PE Size 4.00 MiB
Total PE 5118
Free PE 5116
Allocated PE 2
PV UUID TRlpMQ-snM6-u24f-cMHa-oiVt-XJ3w-6fjAbp
--- Physical volume ---
PV Name unknown device
VG Name vg_test
PV Size 19.99 GiB / not usable 1.43 MiB
Allocatable
yes
PE Size 4.00 MiB
Total PE 5118
Free PE 5118
Allocated PE 0
PV UUID 166hLZ-2POl-GIsv-ELGh-8YVT-Zcoa-ZcLXzp
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[root@docker mnt]
# vgreduce --removemissing vg_test
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/dev/sdd
:
read
failed after 0 of 4096 at 0: Input
/output
error
/dev/sdd1
:
read
failed after 0 of 2048 at 0: Input
/output
error
/dev/sdd
:
read
failed after 0 of 4096 at 21474770944: Input
/output
error
/dev/sdd
:
read
failed after 0 of 4096 at 21474828288: Input
/output
error
/dev/sdd
:
read
failed after 0 of 4096 at 4096: Input
/output
error
/dev/sdd1
:
read
failed after 0 of 512 at 21467824128: Input
/output
error
/dev/sdd1
:
read
failed after 0 of 512 at 21467938816: Input
/output
error
/dev/sdd1
:
read
failed after 0 of 512 at 0: Input
/output
error
/dev/sdd1
:
read
failed after 0 of 512 at 4096: Input
/output
error
Couldn't
find
device with uuid 166hLZ-2POl-GIsv-ELGh-8YVT-Zcoa-ZcLXzp.
Wrote out consistent volume group vg_test
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[root@docker mnt]
# vgchange -a y
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/dev/sdd
:
read
failed after 0 of 4096 at 0: Input
/output
error
/dev/sdd1
:
read
failed after 0 of 2048 at 0: Input
/output
error
1 logical volume(s)
in
volume group
"vg_test"
now active
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[root@docker mnt]
# df -h
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Filesystem Size Used Avail Use% Mounted on
/dev/sda3
193G 14G 170G 8% /
tmpfs 1.9G 228K 1.9G 1%
/dev/shm
/dev/sda1
190M 80M 100M 45%
/boot
/dev/mapper/vg_test-lvm_test
20G 28M 19G 1%
/mnt
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[root@docker mnt]
# pvdisplay
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/dev/sdd
:
read
failed after 0 of 4096 at 0: Input
/output
error
/dev/sdd
:
read
failed after 0 of 4096 at 21474770944: Input
/output
error
/dev/sdd
:
read
failed after 0 of 4096 at 21474828288: Input
/output
error
/dev/sdd
:
read
failed after 0 of 4096 at 4096: Input
/output
error
/dev/sdd1
:
read
failed after 0 of 512 at 21467824128: Input
/output
error
/dev/sdd1
:
read
failed after 0 of 512 at 21467938816: Input
/output
error
/dev/sdd1
:
read
failed after 0 of 512 at 0: Input
/output
error
/dev/sdd1
:
read
failed after 0 of 512 at 4096: Input
/output
error
/dev/sdd1
:
read
failed after 0 of 2048 at 0: Input
/output
error
--- Physical volume ---
PV Name
/dev/sdb1
VG Name vg_test
PV Size 19.99 GiB / not usable 1.43 MiB
Allocatable
yes
(but full)
PE Size 4.00 MiB
Total PE 5118
Free PE 0
Allocated PE 5118
PV UUID fuQdIY-qkJw-fZJB-AauO-Zqpj-91RI-S1GG0X
--- Physical volume ---
PV Name
/dev/sdc1
VG Name vg_test
PV Size 19.99 GiB / not usable 1.43 MiB
Allocatable
yes
PE Size 4.00 MiB
Total PE 5118
Free PE 5116
Allocated PE 2
PV UUID TRlpMQ-snM6-u24f-cMHa-oiVt-XJ3w-6fjAbp
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发现仍旧有I/O的错误出现，跳过重启系统，故障得到解决(这里注意重启前检查fatab信息，看下mount -a是否有报错）。
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[root@docker ~]
# pvdisplay
--- Physical volume ---
PV Name
/dev/sdb1
VG Name vg_test
PV Size 19.99 GiB / not usable 1.43 MiB
Allocatable
yes
(but full)
PE Size 4.00 MiB
Total PE 5118
Free PE 0
Allocated PE 5118
PV UUID fuQdIY-qkJw-fZJB-AauO-Zqpj-91RI-S1GG0X
--- Physical volume ---
PV Name
/dev/sdc1
VG Name vg_test
PV Size 19.99 GiB / not usable 1.43 MiB
Allocatable
yes
PE Size 4.00 MiB
Total PE 5118
Free PE 5116
Allocated PE 2
PV UUID TRlpMQ-snM6-u24f-cMHa-oiVt-XJ3w-6fjAbp
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本文转自 冰冻vs西瓜 51CTO博客，原文链接：http://blog.51cto.com/molewan/1748466，如需转载请自行联系原作者
