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.
In the Create volume window, enter a volume name and specify a size in gigabytes. Note that volumes can be extended later but not shrunk.
Select a storage tier, failure domain, and redundancy scheme. To benefit from high availability, select a scheme other than No redundancy and failure domain other than Disk.

If the desired encoding mode is not listed, you can create a custom scheme by specifying the number of data fragments and parity fragments used for recovery. For more details, refer to Redundancy modes.
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

--encoding <M>+<N>

Storage erasure encoding mapping in the format:

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

To see a full list of available redundancy schemes, run the vinfra cluster storage-redundancies command.

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

Storage failure domain

--replicas <norm>

Storage replication mapping in the format:

norm: the number of replicas to maintain

<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   |          |        |     |
+------------------+--------------+------+--------------+-----------+----------+--------+-----+