When I create an lvmthinpool with size S and poolmetadatasize P, it reduces the available freespace by S+2P. I expected that to be S+P. Where did the extra poolmetadatasize get used? See below for example. before lvcreate we had 255868 free, after we had 254588. The difference is 1280. (1024 + 2*128). # lvm vgcreate --metadatasize=128m myvg0 /dev/vda Physical volume "/dev/vda" successfully created. Volume group "myvg0" successfully created # pvs --unit=m PV VG Fmt Attr PSize PFree /dev/vda myvg0 lvm2 a-- 255868.00m 255868.00m # vgs --unit=m VG #PV #LV #SN Attr VSize VFree myvg0 1 0 0 wz--n- 255868.00m 255868.00m # lvm lvcreate --ignoremonitoring --yes --activate=y \ --setactivationskip=n --size=1024m --poolmetadatasize=128m \ --thinpool=mythinpool myvg0 Thin pool volume with chunk size 64.00 KiB can address at most 15.81 TiB of da ta. Logical volume "mythinpool" created. # vgs --unit=m VG #PV #LV #SN Attr VSize VFree myvg0 1 1 0 wz--n- 255868.00m 254588.00m # lvs --all --unit=m LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert [lvol0_pmspare] myvg0 ewi------- 128.00m mythinpool myvg0 twi-a-tz-- 1024.00m 0.00 10.03 [mythinpool_tdata] myvg0 Twi-ao---- 1024.00m [mythinpool_tmeta] myvg0 ewi-ao---- 128.00m _______________________________________________ linux-lvm mailing list linux-lvm@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
