The latest versions of Red Hat Enterprise Linux, CentOS and Fedora all support LVM thin provisioning. Here's how to tell if a logical volume has been thinly provisioned or not.
Using lvs to display volume information look under the Attr column.
Attribute values have the following meaning:
The lv_attr bits are:
1 Volume type: (C)ache, (m)irrored, (M)irrored without initial sync, (o)rigin, (O)rigin with merging snapshot, (r)aid, (R)aid without initial sync, (s)napshot, merging (S)napshot, (p)vmove, (v)irtual, mirror or raid (i)mage, mirror or raid (I)mage out-of-sync, mirror (l)og device, under (c)onversion, thin (V)olume, (t)hin pool, (T)hin pool data, raid or pool m(e)tadata or pool metadata spare.
This is how lvs looks like when you have a regular LVM setup:
# lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
root rhel_dhcp70-183 -wi-ao---- 17,47g
swap rhel_dhcp70-183 -wi-ao---- 2,00g
When using LVM thin provisioning you're looking for the left-most attribute bit to be V, t or T. Here's an example:
# lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
pool00 rhel_dhcp71-101 twi-aotz-- 14,55g 7,52 3,86
root rhel_dhcp71-101 Vwi-aotz-- 14,54g pool00 7,53
swap rhel_dhcp71-101 -wi-ao---- 2,00g
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