Any possible to use local lvm as storage backend with fs_lvm dm/tm

Community Support
1

hi,

I just get into opennebula not long, I would like to use lvm as storage backend. but didn’t have SAN, any possible to use the host’s local lvm as storage backend? I don’t need the migrated-live or other else HA function. according to the official doc, there are alway suggest to use a shared lun for lvm’s backend.

I got 3 host, each has 2x300G sas and 3x1T sata, running centos 7.5, the one’s version is 5.6.0

2

There is no necessary to have SAN to use LVM as storage backend, but in production with High Load it’s strongly reccomended.

You should to do following:
On the ONE node:

  • create System and Image datastores. Don’t forget to set BRIDGET_LIST (space separated list of all yours hypervisor nodes). Examples of mentioned datastores configs present in the LVM drivers documentation.
  • put your VM image in the just created Image datastore as regular file.
  • create template that uses this image.

On the hypervisor node:

  • initialize 31T SATA as PV (physical volume) via pvcreate command.
  • initialize VG (Volume Group) with the name vg-one-<system_ds_id_got_in_ONE_node.
  • satisfy all requirements for the node (it’s need to allow oneadmin to create/destroy LV (Logical Volume).

Now, you can instantiate your template.

3

thank you @Yurij_Goncharuk
I will try and report back. that would be fantastic if fs_lvm dm/tm can use local host’s lvm instead of a shared storage/LUN.

4

I have been success setup fs_lvm on single node, but when migrate a vm from node-4 to node-5, it failed.

onevm migrate $vm-id $host-id

here is the log:

Fri Nov 16 21:42:52 2018 [Z0][TM][I]: Command execution failed (exit code: 5): /var/lib/one/remotes/tm/fs_lvm/mv node-5:/var/lib/one/datastores/106/36/disk.0 node-6:/var/lib/one/datastores/106/36/disk.0 36 107
Fri Nov 16 21:42:52 2018 [Z0][TM][E]: mv: Command "        set -ex -o pipefail
Fri Nov 16 21:42:52 2018 [Z0][TM][I]: sudo sync
Fri Nov 16 21:42:52 2018 [Z0][TM][I]: sudo lvscan
Fri Nov 16 21:42:52 2018 [Z0][TM][I]: sudo lvchange -ay "/dev/vg-one-106/lv-one-36-0"
Fri Nov 16 21:42:52 2018 [Z0][TM][I]:
Fri Nov 16 21:42:52 2018 [Z0][TM][I]: hostname -f >"/var/lib/one/datastores/106/36/.host" || :" failed: + sudo sync
Fri Nov 16 21:42:53 2018 [Z0][TM][I]: + sudo lvscan
Fri Nov 16 21:42:53 2018 [Z0][TM][I]: + sudo lvchange -ay /dev/vg-one-106/lv-one-36-0
Fri Nov 16 21:42:53 2018 [Z0][TM][I]: Failed to find logical volume "vg-one-106/lv-one-36-0"
Fri Nov 16 21:42:53 2018 [Z0][TM][E]: Error activating disk /var/lib/one/datastores/106/36/disk.0
Fri Nov 16 21:42:53 2018 [Z0][TM][E]: Error executing image transfer script: Error activating disk /var/lib/one/datastores/106/36/disk.0
Fri Nov 16 21:42:53 2018 [Z0][VM][I]: New LCM state is PROLOG_MIGRATE_FAILURE

does the fs_lvm datastore type fully support deploy on local host(not from a shared lun)