Linux下“read failed after 0 of 4096 at 0: Input/output error”

23213ew

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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[iyunv@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

1	[iyunv@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

1	[iyunv@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

1	[iyunv@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

1	[iyunv@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

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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[iyunv@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