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how to resize cinder-volumes ?

i have 500GB space on my servers

after installation i canot create volume > 20GB in dashboard

but can not create volumes that exceed 20GB complex value

How to resize cinder ?

My config is:

[root@openstack ~]# pvdisplay

--- Physical volume ---

PV Name /dev/sda2

VG Name centos_openstack

PV Size 465.27 GiB / not usable 3.00 MiB

Allocatable yes (but full)

PE Size 4.00 MiB

Total PE 119109

Free PE 0

Allocated PE 119109

PV UUID FBFZf6-5bXT-uJuv-VlHt-U7QJ-m3e0-RRl5mv

--- Physical volume ---

PV Name /dev/loop1

VG Name cinder-volumes

PV Size 20.60 GiB / not usable 0

Allocatable yes

PE Size 4.00 MiB

Total PE 5273

Free PE 5273

Allocated PE 0

PV UUID rDSMki-BIlW-HwdO-YlN7-ETo5-k4r1-5r9j2E

[root@openstack ~]# cinder list

+----+--------+--------------+------+-------------+----------+-------------+ | ID | Status | Display Name | Size | Volume Type | Bootable | Attached to | +----+--------+--------------+------+-------------+----------+-------------+ +----+--------+--------------+------+-------------+----------+-------------+

can someone help me? I searched all over the internet but I canot found information how to resise cinder-volumes..