Disks are partitions of an integrated storage data store that can be allocated to specific virtual servers. OnApp Storage disks are managed through the Control Panel > Storage menu. Disks for individual virtual servers are managed through the Control Panel > Cloud > Virtual Servers menu.

  • When you exceed the NBD device path limit, you will see the following message in the UI failure log when starting a virtual server: No free devices available for the operation.
  • Note that the advanced disk sector format is not supported for Integrated Storage disks. Ensure that your disk drives support the 512-byte sector alignment before installing and using them with Integrated Storage.
  • You cannot decrease the size of Integrated Storage data store disks.
  • When you exceed the NBD device path limit, you will see the following message in the UI failure log when starting a virtual server: No free devices available for the operation.

During the backup process, we take a snapshot of the virtual disk to be backed up. Before OnApp 6.8, the snapshot occupied 10% of the virtual disk size in the data store. To make a backup, you should have had a free space of at least 10% of the virtual disk size at nodes where the virtual disk was allocated. Starting with OnApp 6.8, you can configure the size of a snapshot proportionally to the size of a virtual disk.

To configure the snapshot size per cloud basis, open the /onapp/interface/config/info_hub.yml file and change the following parameters:

  • snapshot_percentage_small_vdisk - the size of the vDisk is up to 10 GB; the default snapshot value is 100%
  • snapshot_percentage_medium_vdisk - the size of the vDisk is from 11 to 100 GB; the default snapshot value is 15%
  • snapshot_percentage_large_vdisk - the size of the vDisk is 101 GB and up; the default snapshot value is 5%

Also, you can change snapshot reservation on parent vDisk via the CLI tool from any compute resource:

 onappstore snapreserve uuid=<VDISK UUID> reserve=<PERCENTAGE VALUE, e.g '20'>
CODE

The percentage value must be a multiple of 5 between 5 and 100.