Dne 9.3.2017 v 12:12 Eric Ren napsal(a):
Hello,
I find that it will fail to create a thin pool with all the free PE in VG as
follows:
# pvs
PV VG Fmt Attr PSize PFree
/dev/sdb lvm2 --- 200.00g 200.00g
# vgcreate vgtest /dev/sdb
Volume group "vgtest" successfully created
# pvdisplay
--- Physical volume ---
PV Name /dev/sdb
VG Name vgtest
PV Size 200.00 GiB / not usable 32.00 MiB
Allocatable yes
PE Size 4.00 MiB
Total PE 51192
Free PE 51192
Allocated PE 0
PV UUID JD74c2-R4zZ-cgs5-c5Ty-1abQ-cf7l-gdSxzz
# lvcreate -l 51192 --thinpool thinpool0 vgtest
Volume group "vgtest" has insufficient free space (51167 extents): 51192
required.
while it works when specifying '-l' this way:
# lvcreate -l 100%FREE --thinpool thinpool0 vgtest
Logical volume "thinpool0" created.
Is this something by design? or something may be wrong?
I can replicate this on both:
Hi
Yes this is by DESIGN
When you specify '-l|-L' you specify size of 'dataLV' (logical size)
But then you need some more space for 'metadata' LVs (_tmeta & _pmspare)
-l100%FREE figure this automagically and reduces size a bit to fit in metadata LV.
Some 'future' version of lvm2 may support something like '--physicalsize'
which will be 'a total size used for every allocation made by command).
Regards
Zdenek
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