I saw something today that I don't understand and I'm hoping somebody can help. We had a ~2.5TB thin pool that was showing 69% data utilization in lvs:
# lvs -a
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
my-pool myvg twi-aotz-- 2.44t 69.04 4.90
[my-pool_tdata] myvg Twi-ao---- 2.44t
[my-pool_tmeta] myvg ewi-ao---- 15.81g
However, when I dump the thin pool metadata and look at the mapped_blocks for the 2 devices in the pool, I can only account for about 950GB. Here is the superblock and device entries from the metadata xml. There are no other devices listed in the metadata:
<superblock uuid="" time="34" transaction="68" flags="0" version="2" data_block_size="128" nr_data_blocks="0">
<device dev_id="1" mapped_blocks="258767" transaction="0" creation_time="0" snap_time="14">
<device dev_id="8" mapped_blocks="15616093" transaction="27" creation_time="15" snap_time="34">
That first device looks like it has about 16GB allocated to it and the second device about 950GB. So, I would expect lvs to show somewhere between 950G-966G Is something wrong, or am I misunderstanding how to read the metadata dump? Where is the other 700 or so GB that lvs is showing used?
Thanks,
John
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