Creating volumes

While it is convenient to create desired volumes while creating a target group, you can also do this at any time afterwards.

Prerequisites

A clear understanding of the concept Storage policies.
A target group is created, as described in Creating target groups.

To create a volume

Admin panel

Open Storage services > Block storage > Volumes, and then click Create volume. A wizard will open.
On Name and size, enter a volume name and specify a size in gigabytes. Note that volumes can be extended later but not shrunk.
On Storage policy, select a redundancy mode, a storage tier, and a failure domain. To benefit from high availability, select a mode other than No redundancy and failure domain other than Disk.
On Summary, review the volume details. You can go back to change them if necessary. Click Create.

Command-line interface

Use the following command:

vinfra service block-storage volume create --size <size> --tier {0,1,2,3} (--replicas <norm> | --encoding <M>+<N>)
                                           --failure-domain {0,1,2,3,4} <name>

--size <size>

Volume size, in bytes

--tier {0,1,2,3}

Storage tier (default: 0)

--replicas <norm>

Storage replication mapping in the format:

norm: the number of replicas to maintain (default: 1)

--encoding <M>+<N>

Storage erasure encoding mapping in the format:

M: the number of data blocks
N: the number of parity blocks

--failure-domain {0,1,2,3,4}

Storage failure domain

<name>

Volume name

For example, to create the volume vol1 with the size of 100 GiB, the 3 replicas redundancy mode on tier 0 and the failure domain host, run:

# vinfra service block-storage volume create vol1 --size 107374182400 --tier 0 --replicas 3 --failure-domain 1

The created volume will appear in the vinfra service block-storage volume list output:

# vinfra service block-storage volume list
+------------------+--------------+------+--------------+-----------+----------+--------+-----+
| id               | serial       | name | size         | used_size | grp_name | grp_id | lun |
+------------------+--------------+------+--------------+-----------+----------+--------+-----+
| 9841d72f-5d68<…> | cd96cf1031b6 | vol1 | 107374182400 | 1048576   |          |        |     |
+------------------+--------------+------+--------------+-----------+----------+--------+-----+