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If we know that the PV is orphan, meaning there's at least one MDA on
that PV which does not reference any VG and at the same time there's
PV_EXT_USED flag set, we're certainly in an inconsistent state and we
need to fix this.
For example, such situation can happen during vgremove/vgreduce if we
removed/reduced the VG, but we haven't written PV headers yet because
vgremove stopped abruptly for whatever reason just before writing new
PV headers with updated state, including PV extension flags (and so the
PV_EXT_USED flag).
However, in case the PV has no MDAs at all, we can't double-check
whether the PV_EXT_USED is correct or not - if that PV is marked
as used, it's either:
- really used (but other disks with MDAs are missing)
- or the error state as described above is hit
User needs to overwrite the PV header directly if it's really clear
the PV having no MDAs does not belong to any VG and at the same time
it's still marked as being in use (pvcreate -ff <dev_name> will fix this).
For example - /dev/sda here has 1 MDA, orphan and is incorrectly marked
with PV_EXT_USED flag:
$ pvs --binary -o+pv_in_use
WARNING: Found inconsistent standalone Physical Volumes.
WARNING: Repairing flag incorrectly marking Physical Volume /dev/sda as used.
PV VG Fmt Attr PSize PFree InUse
/dev/sda lvm2 --- 128.00m 128.00m 0
d97f1c89de