Linux下“read failed after 0 of 4096 at 0: Input/output error”
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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
[[email protected] 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
[[email protected] mnt]# vgreduce --removemissing vg_test
/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
[[email protected] mnt]# vgchange -a y
/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
[[email protected] mnt]# df -h
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
[[email protected] 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 --- 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）。
[[email protected] ~]# 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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