Deploying the storage cluster

Create the storage cluster on one (the first) node, then populate it with more nodes.

Limitations

  • You can assign a role to a disk only if its size is greater than 1 GiB.
  • You can assign an additional role to a system disk only if its size is at least 100 GiB.
  • It is recommended to assign the System and Metadata roles to either an SSD disk or different HDDs. Assigning both of these roles to the same HDD disk will result in mediocre performance suitable only for cold data (for example, archiving).
  • The System role cannot be combined with the Cache and Metadata+Cache roles. The reason is that the I/O generated by the operating system and applications would contend with the I/O generated by journaling, thus negating its performance benefits.
  • You can use shingled magnetic recording (SMR) HDDs only with the Storage role and only if the node has an SSD disk with the Cache role.
  • You cannot use SMR and standard disks in the same tier.
  • You cannot assign roles to system and non-system disks at a time.

Prerequisites

To create the storage cluster on the first node

Admin panel

  1. Open the Infrastructure > Nodes screen, and then click Create storage cluster.
  2. In the Create storage cluster window, enter a name for the cluster. The cluster name may only contain Latin letters (a-z, A-Z), numbers (0-9), and hyphens ("-"). It must start with a letter and end with a letter or number.
  3. Enable disk encryption for tiers. You can also enable it later.

  4. Select one node to create the storage cluster from, and then click Next.

  5. In the next window, check the default disk configuration. If it is correct, proceed to create the storage cluster.

    Also, you can assign roles to your disks manually or use Disk actions to work with the disks.

    • To assign roles to disks manually, do the following:

    • To assign roles to disks automatically, click Disk actions > Configure automatically.
    • To assign a role to multiple disks at a time, click Disk actions > Bulk disk management, select disks, and then click Assign role. Choose the desired role for the selected disks, and then click Assign.
    • To reset the disk configuration, click Disk actions > Clear configuration.
  6. Once you finish configuring the disks, click Create, to create the storage cluster.

You can monitor cluster creation on the Infrastructure > Nodes screen. The creation might take some time, depending on the number of disks to be configured. Once the configuration is complete, the cluster is created.

Command-line interface

Use the following command:

vinfra cluster create [--disk <disk>:<role>[:<key=value,…>]] [--tier-encryption {0,1,2,3}]
                      --node <node> <cluster-name>
--disk <disk>:<role> [:<key=value,…>]

Disk configuration in the format:

  • <disk>: disk device ID or name
  • <role>: disk role (cs, mds, journal, mds-journal, mds-system, cs-system, system)
  • comma-separated key=value pairs with keys (optional):
    • tier: disk tier (0, 1, 2 or 3)
    • journal-tier: journal (cache) disk tier (0, 1, 2 or 3)
    • journal-type: journal (cache) disk type (no_cache, inner_cache or external_cache)
    • journal-disk: journal (cache) disk ID or device name

    • bind-address: bind IP address for the metadata service

Example: sda:cs:tier=0,journal-type=inner_cache.
This option can be used multiple times.

--tier-encryption {0,1,2,3}
Enable encryption for storage cluster tiers. Encryption is disabled by default. This option can be used multiple times.
--node <node>
Node ID or hostname
<cluster-name>
Storage cluster name

For example, to create the storage cluster stor1 on the node node001, run:

# vinfra cluster create stor1 --node node001

As disk roles are not explicitly specified, they are assigned automatically: mds-system to the system disk, and cs to all other disks.

You can view the storage cluster details in the vinfra cluster show output:

# vinfra cluster show
+-------+--------------------------------------------+
| Field | Value                                      |
+-------+--------------------------------------------+
| id    | 1                                          |
| name  | stor1                                      |
| nodes | - host: node001.vstoragedomain             |
|       |   id: f59dabdb-bd1c-4944-8af2-26b8fe9ff8d4 |
|       |   is_installing: false                     |
|       |   is_releasing: false                      |
+-------+--------------------------------------------+

To add nodes to the cluster

Admin panel

  1. On the Infrastructure > Nodes screen, click an unassigned node.
  2. On the node right pane, click Join to cluster.
  3. In the Join node to storage cluster window, check the default disk configuration. If it is correct, proceed to join the node to the storage cluster.

    Also, you can assign roles to your disks manually or use Disk actions to work with the disks. Alternatively, you can copy the disk configuration from another node by clicking Copy configuration from and selecting the desired node.

  4. Once you finish configuring the disks, click Join, to add the node to the storage cluster.

Command-line interface

Use the following command:

vinfra node join [--disk <disk>:<role>[:<key=value,…>]] <node>
--disk <disk>:<role> [:<key=value,…>]

Disk configuration in the format:

  • <disk>: disk device ID or name
  • <role>: disk role (cs, mds, journal, mds-journal, mds-system, cs-system, system)
  • comma-separated key=value pairs with keys (optional):
    • tier: disk tier (0, 1, 2 or 3)
    • journal-tier: journal (cache) disk tier (0, 1, 2 or 3)
    • journal-type: journal (cache) disk type (no_cache, inner_cache or external_cache)
    • journal-disk: journal (cache) disk ID or device name

    • bind-address: bind IP address for the metadata service

Example: sda:cs:tier=0,journal-type=inner_cache.
This option can be used multiple times.

<node>
Node ID or hostname

For example, to add the node node002 to the storage cluster and assign roles to disks: mds-system to sda, cs to sdb and sdc, run:

# vinfra node join f59dabdb-bd1c-4944-8af2-26b8fe9ff8d4 --disk sda:mds-system \
--disk sdb:cs --disk sdc:cs

The added node will appear in the vinfra node list output:

# vinfra node list
+--------------+--------------+------------+-----------+-------------+----------+
| id           | host         | is_primary | is_online | is_assigned | is_in_ha |
+--------------+--------------+------------+-----------+-------------+----------+
| 09bb6b8<...> | node001<...> | True       | True      | True        | False    |
| 187edb1<...> | node002<...> | False      | True      | True        | False    |
+--------------+--------------+------------+-----------+-------------+----------+