One additional issue.
6. Once the PV metadata ring has been used a lot, pvck finds few or
zero metadata regions, often not including the current one.
This should be straightforward to reproduce. Here's what I currently see.
# pvck -v /dev/sdb2 # the replacement disk
Scanning /dev/sdb2
Found label on /dev/sdb2, sector 1, type=LVM2 001
Found text metadata area: offset=4096, size=1044480
Found LVM2 metadata record at offset=481280, size=22016, offset2=0 size2=0
Found LVM2 metadata record at offset=459264, size=22016, offset2=0 size2=0
Found LVM2 metadata record at offset=437248, size=22016, offset2=0 size2=0
Found LVM2 metadata record at offset=415232, size=22016, offset2=0 size2=0
Found LVM2 metadata record at offset=392704, size=22528, offset2=0 size2=0
Found LVM2 metadata record at offset=370176, size=22528, offset2=0 size2=0
Found LVM2 metadata record at offset=347136, size=23040, offset2=0 size2=0
Found LVM2 metadata record at offset=324608, size=22528, offset2=0 size2=0
Found LVM2 metadata record at offset=302080, size=22528, offset2=0 size2=0
Found LVM2 metadata record at offset=279040, size=23040, offset2=0 size2=0
Found LVM2 metadata record at offset=256512, size=22528, offset2=0 size2=0
Found LVM2 metadata record at offset=233984, size=22528, offset2=0 size2=0
Found LVM2 metadata record at offset=210944, size=23040, offset2=0 size2=0
Found LVM2 metadata record at offset=188416, size=22528, offset2=0 size2=0
Found LVM2 metadata record at offset=165888, size=22528, offset2=0 size2=0
Found LVM2 metadata record at offset=142848, size=23040, offset2=0 size2=0
Found LVM2 metadata record at offset=119296, size=23552, offset2=0 size2=0
Found LVM2 metadata record at offset=95744, size=23552, offset2=0 size2=0
Found LVM2 metadata record at offset=72704, size=23040, offset2=0 size2=0
Found LVM2 metadata record at offset=50176, size=22528, offset2=0 size2=0
Found LVM2 metadata record at offset=27136, size=23040, offset2=0 size2=0
# .../parse_pv_meta /dev/sdb2 | wc
/dev/sdb2
Found label at 512 of type LVM2 001 with CRC 668745670
PV header for UUID UTRUfMiTVIWpuGbVMYbRh8te3c2QvuSE with device_size
1999861972992
data area at 1048576 size 0
metadata area at 4096 size 1044480
reading metadata at 4096 of size 1044480
metadata header looks OK
region at 499200 rsize 21907 rflags 0 and CRC 3460382297
1532 3190 21906
# pvck -v /dev/sda2 # an older disk
Scanning /dev/sda2
Found label on /dev/sda2, sector 1, type=LVM2 001
Found text metadata area: offset=4096, size=1044480
Found LVM2 metadata record at offset=935936, size=22016, offset2=0 size2=0
# .../parse_pv_meta /dev/sda2 | wc # my utility
/dev/sda2
Found label at 512 of type LVM2 001 with CRC 3061781507
PV header for UUID 9WMRxLdsD6Or0ehN0xuRsRqmiprfdJtK with device_size
1999860997632
data area at 1048576 size 0
metadata area at 4096 size 1044480
reading metadata at 4096 of size 1044480
metadata header looks OK
region at 953856 rsize 21907 rflags 0 and CRC 3460382297
1532 3190 21906
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