卸下物理驱动器后，卸下vg和lv

我们在服务器中发生磁盘故障，并在从LVM中删除驱动器之前将其更换。

该服务器有4个物理驱动器（PV），每个都有自己的卷组（VG）。每个VG具有2个或多个逻辑卷（LV）。现在LVM抱怨缺少驱动器。因此，我们有一个带有两个LV的VG（vg04），这些LV变成了孤立的孤儿，超出了我们从系统中清除的需要。

问题是，每当我们运行任何LVM命令时，都会出现以下“读取失败”错误：

# lvscan
  /dev/vg04/swap: read failed after 0 of 4096 at 4294901760: Input/output error
  /dev/vg04/swap: read failed after 0 of 4096 at 4294959104: Input/output error
  /dev/vg04/swap: read failed after 0 of 4096 at 0: Input/output error
  /dev/vg04/swap: read failed after 0 of 4096 at 4096: Input/output error
  /dev/vg04/vz: read failed after 0 of 4096 at 995903864832: Input/output error
  /dev/vg04/vz: read failed after 0 of 4096 at 995903922176: Input/output error
  /dev/vg04/vz: read failed after 0 of 4096 at 0: Input/output error
  /dev/vg04/vz: read failed after 0 of 4096 at 4096: Input/output error

# vgreduce vg04 --removemissing --force
  /dev/vg04/swap: read failed after 0 of 4096 at 4294901760: Input/output error
  /dev/vg04/swap: read failed after 0 of 4096 at 4294959104: Input/output error
  /dev/vg04/swap: read failed after 0 of 4096 at 0: Input/output error
  /dev/vg04/swap: read failed after 0 of 4096 at 4096: Input/output error
  /dev/vg04/vz: read failed after 0 of 4096 at 995903864832: Input/output error
  /dev/vg04/vz: read failed after 0 of 4096 at 995903922176: Input/output error
  /dev/vg04/vz: read failed after 0 of 4096 at 0: Input/output error
  /dev/vg04/vz: read failed after 0 of 4096 at 4096: Input/output error
  Volume group "vg04" not found

# vgchange -a n /dev/vg04
  /dev/vg04/swap: read failed after 0 of 4096 at 4294901760: Input/output error
  /dev/vg04/swap: read failed after 0 of 4096 at 4294959104: Input/output error
  /dev/vg04/swap: read failed after 0 of 4096 at 0: Input/output error
  /dev/vg04/swap: read failed after 0 of 4096 at 4096: Input/output error
  /dev/vg04/vz: read failed after 0 of 4096 at 995903864832: Input/output error
  /dev/vg04/vz: read failed after 0 of 4096 at 995903922176: Input/output error
  /dev/vg04/vz: read failed after 0 of 4096 at 0: Input/output error
  /dev/vg04/vz: read failed after 0 of 4096 at 4096: Input/output error
  Volume group "vg04" not found

# lvchange -a n /dev/vg04/vz
  /dev/vg04/swap: read failed after 0 of 4096 at 4294901760: Input/output error
  /dev/vg04/swap: read failed after 0 of 4096 at 4294959104: Input/output error
  /dev/vg04/swap: read failed after 0 of 4096 at 0: Input/output error
  /dev/vg04/swap: read failed after 0 of 4096 at 4096: Input/output error
  /dev/vg04/vz: read failed after 0 of 4096 at 995903864832: Input/output error
  /dev/vg04/vz: read failed after 0 of 4096 at 995903922176: Input/output error
  /dev/vg04/vz: read failed after 0 of 4096 at 0: Input/output error
  /dev/vg04/vz: read failed after 0 of 4096 at 4096: Input/output error
  Volume group "vg04" not found
  Skipping volume group vg04

丢失的VG和LV并不重要，我们只想删除它们。

如您所见，到目前为止，我们没有尝试过所有提出的建议。

可以从http://pastebin.com/MHiBzrLJ检查“ lvm dumpconfig”的输出

解决方案是运行dmsetup，在本例中为两个命令

dmsetup remove vg04-vz
dmsetup remove vg04-swap

在执行此操作之前，我使用命令“ dmsetup info”检查了两个LV的“开放计数”为零。

警告： dmsetup可能会严重破坏磁盘，因此以后使用此信息的任何人都请确保已阅读手册页。

卸下VMware磁盘后，我遇到了类似的情况/dev/sdb。

使用lsscsi确定正在使用的设备（您可能需要安装程序），然后运行lsscsi：

# lsscsi
[1:0:0:0]    cd/dvd  NECVMWar VMware IDE CDR10 1.00  /dev/sr0
[2:0:0:0]    disk    VMware   Virtual disk     1.0   /dev/sda
[2:0:1:0]    disk    VMware   Virtual disk     1.0   /dev/sdb <== the removed physical disk
[2:0:2:0]    disk    VMware   Virtual disk     1.0   /dev/sdc

现在用以下命令写入删除文件

# echo 1 > /sys/class/scsi_device/2\:0\:1\:0/device/delete

设备立即不见了。

vgchange -an / dev / vg04

如果逻辑卷仍处于活动状态，则可能必须

lvchange -a n /dev/vg04/swap
lvchange -a n dev/vg04/vz

等等