O049、准备 LVM Volume Provider

参考https://www.cnblogs.com/CloudMan6/p/5597790.html   Cinder 真正负责volume 管理的组件是 volume provider 。Cinder 支持多种 volume provider ，LVM 是默认的volume provider。DevStack 安装之后， /etc/cinder/cinder.conf 已经配置好了LVM。   [root@DevStack-Rocky-Controller-31 ~]# cat /etc/cinder/cinder.conf   [DEFAULT]   default_volume_type = lvmdriver-1 enabled_backends = lvmdriver-1   [lvmdriver-1] image_volume_cache_enabled = True volume_clear = zero lvm_type = auto target_helper = lioadm volume_group = stack-volumes-lvmdriver-1 volume_driver = cinder.volume.drivers.lvm.LVMVolumeDriver volume_backend_name = lvmdriver-1   上面的配置定义了名为 lvmdriver-1 的 volume provider，也称作 back-end。其driver 是LVM，LVM的volume group 名为 stack-volumes-lvmdriver-1 。DevStack 部署 rocky版本的OpenStack 已经帮我们都配置好了。   [root@DevStack-Rocky-Compute-12 lvm]# vgdisplay   --- Volume group ---   VG Name               stack-volumes-default   System ID                Format                lvm2   Metadata Areas        1   Metadata Sequence No  1   VG Access             read/write   VG Status             resizable   MAX LV                0   Cur LV                0   Open LV               0   Max PV                0   Cur PV                1   Act PV                1   VG Size               <24.00 GiB   PE Size               4.00 MiB   Total PE              6143   Alloc PE / Size       0 / 0      Free  PE / Size       6143 / <24.00 GiB   VG UUID               5IdgWN-YX3V-rxNR-08SG-OjDw-M9xS-al102A       --- Volume group ---   VG Name               centos   System ID                Format                lvm2   Metadata Areas        1   Metadata Sequence No  4   VG Access             read/write   VG Status             resizable   MAX LV                0   Cur LV                3   Open LV               3   Max PV                0   Cur PV                1   Act PV                1   VG Size               <159.00 GiB   PE Size               4.00 MiB   Total PE              40703   Alloc PE / Size       40702 / 158.99 GiB   Free  PE / Size       1 / 4.00 MiB   VG UUID               O7gUtM-Ef0y-XsZ0-trOc-fpWX-uYcc-pefodm       --- Volume group ---   VG Name               stack-volumes-lvmdriver-1   System ID                Format                lvm2   Metadata Areas        1   Metadata Sequence No  4   VG Access             read/write   VG Status             resizable   MAX LV                0   Cur LV                1   Open LV               0   Max PV                0   Cur PV                1   Act PV                1   VG Size               <24.00 GiB   PE Size               4.00 MiB   Total PE              6143   Alloc PE / Size       5849 / <22.85 GiB   Free  PE / Size       294 / <1.15 GiB   VG UUID               5RFdup-8ta0-QsOv-t42v-bAOa-oaX9-gLSPla         后面各小节都将以 LVM 为 volume provider 详细介绍 volume的 各种操作。