Dell EMC PowerPath for Linux 7.4 及次要版本安装和管理指南

[root@hostname~] # vgchange -ay ppvg
  WARNING: Not using lvmetad because duplicate PVs were found.
  WARNING: Use multipath or vgimportclone to resolve duplicate PVs?
  WARNING: After duplicates are resolved, run "pvscan --cache" to enable lvmetad.
  /dev/sdb: open failed: No medium found
  /dev/sdc: open failed: No medium found
  WARNING: Not using device /dev/sdd2 for PV USHeZ8-rhWS-AuOY-LYL1-AYHZ-Aew4-xzPykl.
  WARNING: Not using device /dev/sdg2 for PV USHeZ8-rhWS-AuOY-LYL1-AYHZ-Aew4-xzPykl.
  WARNING: Not using device /dev/sdf for PV 5MwDqG-WUAO-ZJT3-B0wB-CHnB-e2w8-9UxVry.
  WARNING: Not using device /dev/sdh for PV 5MwDqG-WUAO-ZJT3-B0wB-CHnB-e2w8-9UxVry.
  WARNING: PV USHeZ8-rhWS-AuOY-LYL1-AYHZ-Aew4-xzPykl prefers device /dev/sda2 because device is used by LV.
  WARNING: PV USHeZ8-rhWS-AuOY-LYL1-AYHZ-Aew4-xzPykl prefers device /dev/sda2 because device is used by LV.
  WARNING: PV 5MwDqG-WUAO-ZJT3-B0wB-CHnB-e2w8-9UxVry prefers device /dev/sde because device is used by LV.
  WARNING: PV 5MwDqG-WUAO-ZJT3-B0wB-CHnB-e2w8-9UxVry prefers device /dev/sde because device is used by LV.
  Cannot activate LVs in VG ppvg while PVs appear on duplicate devices.
  o logical volume(s) in volume group "ppvg" now active

# Configuration option devices/allow_changes_with_duplicate_pvs.
# Allow VG modification while a PV appears on multiple devices.
# When a PV appears on multiple devices, LVM attempts to choose the
# best device to use for the PV. If the devices represent the same
# underlying storage, the choice has minimal consequence. If the
# devices represent different underlying storage, the wrong choice
# can result in data loss if the VG is modified. Disabling this
# setting is the safest option because it prevents modifying a VG
# or activating LVs in it while a PV appears on multiple devices.
# Enabling this setting allows the VG to be used as usual even with
# uncertain devices.
allow_changes_with_duplicate_pvs = 0