lvm报Error reading device 解决办法

作者：吴业亮
博客：wuyeliang.blog.csdn.net

```bash
# pvs
  Error reading device /dev/data/etc at 0 length 512.
  Error reading device /dev/data/etc at 0 length 4.
  Error reading device /dev/data/etc at 4096 length 4.
  Error reading device /dev/data/log at 0 length 512.
  Error reading device /dev/data/log at 0 length 4.
  Error reading device /dev/data/log at 4096 length 4.
  Error reading device /dev/data/lib at 0 length 512.
  Error reading device /dev/data/lib at 0 length 4.
  Error reading device /dev/data/lib at 4096 length 4.
  PV         VG   Fmt  Attr PSize    PFree   
  /dev/sda4  data lvm2 a--   193.46g       0 
  /dev/sdg   ff   lvm2 a--  <200.00g <200.00g

查看设备

# dmsetup ls 
data-log        (253:4)
data-arstore    (253:2)
data-etc (253:5)
data-log (253:6)
data-lib (253:7)
data-backup     (253:3)
data-datastore2 (253:0)
data-datastore1 (253:1)

清除设备

# dmsetup remove  /dev/mapper/
control          data-etc          data-lib          data-log          data-arstore     data-backup      data-datastore1  data-datastore2  data-log         
# dmsetup remove  /dev/mapper/data-etc 
# dmsetup remove  /dev/mapper/data-lib
# dmsetup remove  /dev/mapper/data-log

删除vg，并重新创建

# vgs
  VG   #PV #LV #SN Attr   VSize    VFree   
  data   1   5   0 wz--n-  193.46g       0 
  ff     1   0   0 wz--n- <200.00g <200.00g
# vgremove  data
  Volume group "data" successfully removed
# vgcreate  data  /dev/sdg
  Volume group "data" successfully created