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Cloud Server network volumes

Network volumes are scalable block devices that can be easily transferred between cloud servers. They are suitable for scaling server disk space without changing the boot disk. Triple replication of disk volumes ensures high data integrity.

A network volume can be created along with a cloud server or created separately, and then you can create a server from it or connect it to a server as an additional disk.

You can work with network volumes in the control panel, using OpenStack CLI or Terraform.

You can track network volume metrics for cloud servers using the Metrics service.

Records of operations with network volumes are saved in audit logs.

Features of network volumes

Types of network volumes

  • HDD Basic — HDD based on enterprise-class SATA disks. Suitable for storing large amounts of data that do not need to be frequently read or overwritten;
  • SSD Basic — SSD for tasks that do not require high read and write speeds. Throughput and IOPS are higher than those of the basic HDD;
  • SSD Universal — SSD, suitable for use as a cloud server boot disk;
  • SSD Universal v2 — SSD with the ability to change the IOPS limit and without fixed separation of read and write operations. Suitable for tasks with uneven load. When choosing the maximum number of IOPS, it is suitable for CRM systems, monitoring systems, and for working with big data;
  • SSD Fast — SSD NVMe with lower latency and higher performance compared to other types. Suitable for workloads requiring high read and write speeds.
  • SSD Fast v2 — SSD NVMe with the ability to change the IOPS limit and without fixed separation of read and write operations. Suitable for tasks requiring high I/O speeds and a level of fault tolerance.

Disk types differ in recommended size limits, throughput values, and the number of read and write operations. See the Network volume limits table for details.

Different disk types are available in different pool segments. You can check the availability of types in the Cloud Platform network volumes availability matrix.

You can view the list of IDs and type names in the List of network volume types subsection.

Network volume limits

The maximum size of boot and additional network volumes, throughput values, and the number of IOPS depend on the disk type.

Disks of the same type in different pool segments may have different limits. For example, if two network volumes with the SSD Universal type are located in different segments (the first disk in ru-1c, the second in ru-8a), their limits will differ.

Maximum size for a boot diskMaximum size for an additional diskThroughput
(4 MB blocks)		Number of operations
(read, 4 KB blocks)		Number of operations
(write, 4 KB blocks)
HDD Basic
(all available pool segments)		500 GB10 TB100 MB/s320 IOPS120 IOPS
SSD Basic
(ru-2b, ru-2c, ru-3b, ru-7a, ru-7b, ru-8a, ru-9a)		500 GB10 TB150 MB/s640 IOPS320 IOPS
SSD Universal
(ru-1a, ru-1b, ru-1c, ru-2a, ru-3a)		2 TB10 TB150 MB/s640 IOPS320 IOPS
SSD Universal
(ru-2b, ru-2c, ru-3b, ru-7a, ru-7b, ru-8a, ru-9a, uz-1a, uz-2a, kz-1a, ke-1a)		5 TB10 TB200 MB/s7 000 IOPS4 000 IOPS
SSD
Universal v2
(ru-2c, ru-3b, ru-6a, ru-6b, ru-6c, ru-7a, ru-7b, ru-8a, ru-9a, uz-1a, uz-2a, kz-1a, ke-1a)		10 TB10 TB200 MB/s2 000 — 16 000 IOPS
(without separation
of read and write)
SSD Fast
(ru-1a, ru-1b, ru-1c, ru-2a, ru-2b, ru-3a)		2 TB10 TB500 MB/s12 800 IOPS6 400 IOPS
SSD Fast
(ru-2c, ru-3b, ru-7a, ru-7b, ru-8a, ru-9a, uz-1a, uz-2a, kz-1a, ke-1a)		10 TB10 TB500 MB/s25 000 IOPS15 000 IOPS
SSD Fast v2
(ru-6a, ru-6b, ru-6c)		10 TB10 TB1 000 MB/s25 000 — 75 000 IOPS
(without separation
of read and write)

You can test disk performance.

What affects performance

Different disk types have different IOPS values—the number of read and write operations per second. Creating and checking the file system are procedures that require a certain number of read and write operations to the disk. The higher the performance of the disk, the faster these operations are completed.

When a cloud server starts for the first time, the file system on the system disk expands to the size of the disk. The larger the disk size and the lower its IOPS limits, the longer this process will take, and consequently, the longer it will take for the cloud server to start.

The file system size affects the state check time in the event of an abnormal server shutdown. Checking is enabled by default for boot (system) disks of all servers that are created from pre-made images.

List of network volume types

The IDs or names of network volume types are used to create network volumes via OpenStack CLI and Terraform. IDs and names differ across pool segments.

note

For example, 94350392-3e5c-4b5a-8a51-873f02af833b is an ID, and basicssd.ru-9a is the name used to create a network volume of the SSD Basic type in the ru-9a pool segment.

You can view the list of network volume types in all pool segments in a table or view the list of network volume types in a specific pool via OpenStack CLI.

List of network volume types in all pool segments

IDName
8944eef9-662a-4fbf-80ac-aa2155c6d864basic.uz-1a
38e86933-a095-4b77-8918-62d59721186auniversal.uz-1a
280c4b5f-fd04-4cbe-a22f-6f9670172e44fast.uz-1a
3802e9ce-5427-4285-b571-5fcae8670bbduniversal2.uz-1a

Where:

  • ID — the ID of the network volume type;
  • Name — the name of the network volume type and pool segment in the type.pool_segment format, for example basic.ru-9a. Available types:
    • basic — HDD Basic type;
    • basicssd — SSD Basic type;
    • universal — SSD Universal type;
    • universal2 — SSD Universal v2 type;
    • fast — SSD Fast type;
    • fast2 — SSD Fast v2 type.

View a list of network volume types in a specific pool

  1. Open the OpenStack CLI.

  2. View the list of types:

    openstack volume type list

    Example response for the ru-9 pool:

    +--------------------------------------+-----------------+
    | ID                                   | Name            |
    +--------------------------------------+-----------------+
    | 8ab097f3-3ffc-4fc4-9771-01fd512936eb | basic.ru-9a     |
    | 94350392-3e5c-4b5a-8a51-873f02af833b | basicssd.ru-9a  |
    | 52666f65-ec91-4c09-ad7e-207d10553e4a | universal.ru-9a |
    | 2eab725b-4797-4c34-9e1b-4ad083629608 | universal2.ru-9a|
    | a67bd670-633b-4c82-bb91-84058140aa05 | fast.ru-9a      |
    +--------------------------------------+-----------------+

    Where:

    • ID — the ID of the network volume type;
    • Name — the name of the network volume type and pool segment in the type.pool_segment format, for example basic.ru-9a. Available types:
      • basic — HDD Basic type;
      • basicssd — SSD Basic type;
      • universal — SSD Universal type;
      • universal2 — SSD Universal v2 type;
      • fast — SSD Fast type.

Cost

Network volumes are billed according to the cloud platform payment model.

Each GB of network volumes is charged. The cost depends on the type of network volume, size, and the pool segment in which it is located.

You can view the size of the network volume in the control panel: in the top menu, click Products → Cloud Servers → Disks section → disk row → Size.

For SSD Universal v2 and SSD High-speed v2 network volumes, the number of IOPS used is also charged. The maximum number of IOPS per hour is taken into account. For SSD Universal v2, the first 2 000 IOPS are provided free of charge, for SSD High-speed v2 — the first 25 000 IOPS. You can view the number of IOPS in the Control Panel: in the top menu, click Products → Cloud Servers → section Volumes → volume page → tab Settings.

The cost per GB (for all types of network volumes) and per IOPS (for SSD Universal v2 and SSD Fast v2 type disks) can be viewed at servercore.com.