Openstack All-In-One local storage size

Question

after few deployment of openstack (packstack all-in-one) I founded that (from hypervisor summary) the local storage size is around 40G-50G. The disk storage that I deployed is actually around 150G and 250G but keep getting around 40-50G in openstack. The same behavior when I run over VM and baremetal. During OS(Centos7) installation I just using default auto setup...all storage size (sda) and never set manual. For example this is the VGS output from VM with 150G storage running openstack

VG             #PV #LV #SN Attr   VSize    VFree
  centos           1   3   0 wz--n- <149.00g    4.00m
  cinder-volumes   1   2   0 wz--n-  <20.60g 1012.00m

  --- Volume group ---
  VG Name               cinder-volumes
  System ID
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  42
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                2
  Open LV               1
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               <20.60 GiB
  PE Size               4.00 MiB
  Total PE              5273
  Alloc PE / Size       5020 / <19.61 GiB
  Free  PE / Size       253 / 1012.00 MiB
  VG UUID               rRywdY-5bzs-RnUo-P6p2-JshS-Hw79-zdaje8

  --- Physical volume ---
  PV Name               /dev/sda2
  VG Name               centos
  PV Size               <149.00 GiB / not usable 3.00 MiB
  Allocatable           yes
  PE Size               4.00 MiB
  Total PE              38143
  Free PE               1
  Allocated PE          38142
  PV UUID               833flN-LOb9-qccj-wfdx-5fy7-UWB8-kcbsQe

  --- Physical volume ---
  PV Name               /dev/loop1
  VG Name               cinder-volumes
  PV Size               <20.60 GiB / not usable 2.00 MiB
  Allocatable           yes
  PE Size               4.00 MiB
  Total PE              5273
  Free PE               253
  Allocated PE          5020
  PV UUID               mawPKG-IBfM-EWRN-pqXD-9hyD-ZL0q-vwgI99

lsblk -o NAME,FSTYPE,SIZE,MOUNTPOINT,LABEL
NAME                                                                   FSTYPE       SIZE MOUNTPOINT              LABEL
sda                                                                                 150G
├─sda1                                                                 xfs            1G /boot
└─sda2                                                                 LVM2_member  149G
  ├─centos-root                                                        xfs           50G /
  ├─centos-swap                                                        swap         5.9G [SWAP]
  └─centos-home                                                        xfs         93.1G /home
sdb                                                                                  20G
├─sdb1                                                                             1007K
├─sdb2                                                                 vfat         256M                         EFI
└─sdb3                                                                 ext4         9.8G                         persistence
sr0                                                                    iso9660     55.9M                         VMware Tools
loop0                                                                  ext4           2G /srv/node/swiftloopback
loop1                                                                  LVM2_member 20.6G
├─cinder--volumes-cinder--volumes--pool_tmeta                                        20M
│ └─cinder--volumes-cinder--volumes--pool-tpool                                    19.6G
│   ├─cinder--volumes-cinder--volumes--pool                                        19.6G
│   └─cinder--volumes-volume--ae0fccdd--2b8a--4103--a50f--5475274eb215               20G
└─cinder--volumes-cinder--volumes--pool_tdata                                      19.6G
  └─cinder--volumes-cinder--volumes--pool-tpool                                    19.6G
    ├─cinder--volumes-cinder--volumes--pool                                        19.6G
    └─cinder--volumes-volume--ae0fccdd--2b8a--4103--a50f--5475274eb215               20G

Even with 150G hard disk storage cinder-volumes is <20g ...

From openstack hypervisor it show local disk usage is around 49G

Please someone advise me how to get bigger storage on my openstack. Thank you.

Answer 1

What do you mean by storage size? If you mean the amount of storage for Cinder volumes, adjust the CONFIG_CINDER_VOLUMES_SIZE parameter. The documentation isn't clear about it, but I think the number is in Gigabytes. However, this only works if your root filesystem has enough space.

If you mean ephemeral storage, you also need to have a root filesystem that is large enough. I see that your system has three LVM volumes for root, swap and home. My suspicion is that your root volume (named centos-root) is too small. If that is the case, create a Centos installation that does not separate root and home and try again.

Adding additional information to answer the below questions:

The storage size reported in the hypervisor summary refers to the space available in Nova's instances directory, probably under /var/lib/nova (not sure). Which is on your root filesystem.

Packstack uses an LVM volume group as the storage backend for Cinder. The physical volume for that volume group resides on a loop device /dev/loop1, which is a file that resides on the root filesystem. Therefore, Cinder's storage does take up space in your root filesystem. Use the command losetup -a to see that file.