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Cloud server network disks
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Cloud server network disks

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

You can create a network disk with the cloud server or  create it separately and then create a server from it or connect it to the server as an additional disk.

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

Features of network drives⁠

Types of network disks⁠

  • HDD Basic — HDD disk based on enterprise-class SATA disks. Suitable for storing large amounts of data that do not need to be read or rewritten frequently;
  • SSD Basic — SSD disk for applications where high read and write speeds are not required. Throughput and IOPS are higher than the basic HDD;
  • SSD Universal — SSD disk, suitable for use as a cloud server boot disk;
  • SSD Universal v2 — SSD disk with the ability to change the IOPS limit and without fixed division of the number of read and write operations. Suitable for tasks with uneven load. If you select the maximum number of IOPS, it is suitable for CRM-systems, monitoring systems and for working with big data;
  • SSD Fast — SSD NVMe disk with lower response time and faster performance than other types. Suitable for workloads that require high read and write speeds.

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

Different disk types are available in different segments of the pool. You can view the availability of the types in the Cloud Platform Network Disk Availability Matrix.

To see a list of IDs and type names, see the Network Disk Type List subsection.

Network disk limits⁠

The maximum size of boot and additional network disks, throughput values, and 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 disks with the SSD Universal type are in different segments (the first disk in ru-1c and the second in ru-8a), their limits will be different.

HDD
Basic
(all
available
segments
pool)		SSD
Basic
(ru-2b, ru-2c, ru-3b, ru-7a, ru-7b, ru-8a, ru-9a)		SSD
Universal
(ru-1a, ru-1b, ru-1c, ru-2a, ru-3a)		SSD
Universal
(ru-2b, ru-2c, ru-3b, ru-7a, ru-7b, ru-8a, ru-9a, gis-1a, uz-1a, uz-2a, kz-1a, ke-1a)		SSD
Universal v2
(ru-2c, ru-3b, ru-7a, ru-7b, ru-8a, ru-9a, gis-1a, uz-1a, uz-2a, kz-1a, ke-1a)		SSD
Quick
(ru-1a, ru-1b, ru-1c, ru-2a, ru-2b, ru-3a)		SSD
Quick
(ru-2c, ru-3b, ru-7a, ru-7b, ru-8a, ru-9a, gis-1a, uz-1a, uz-2a, kz-1a, ke-1a)
Maximum
size
to boot
disk		500 GB500 GB2 TB.5 TB.10 TB.2 TB.10 TB.
Maximum
size
for additional
disk		10 TB.10 TB.10 TB.10 TB.10 TB.10 TB.10 TB.
Throughput
capacity
(4 MB blocks)		100 MB/s.150 MB/s.150 MB/s.200 MB/s.200 MB/s.500 MB/s500 MB/s
Quantity
operations
(reading,
4KB blocks)		320 IOPS640 IOPS640 IOPS7,000 IOPS2,000 — 16,000 IOPS
(unbundled
read and write)		12,800 IOPS25,000 IOPS
Quantity
operations
(record,
4KB blocks)		120 IOPS320 IOPS320 IOPS4,000 IOPS2,000 — 16,000 IOPS
(unbundled
read and write)		6,400 IOPS15,000 IOPS

You can test the performance of the disks.

What affects performance⁠

Different types of disks have different IOPS values — the number of read and write operations per second. File system creation and verification are procedures that require a certain number of reads and writes to the disk. The higher the performance of the disk, the faster these operations are completed.

When a cloud server first starts up, the file system on the system disk is "stretched" to fit the size of the disk. The larger the disk size and the lower its IOPS limits, the longer this process will take — hence the longer the cloud server will take to start up.

The size of the file system affects the time to check its state in case of a server crash. Checking is enabled by default for boot (system) disks of all servers that are created from ready-made images.

List of network disk types⁠

Network disk type IDs or names are used to create network disks through the OpenStack CLI and Terraform. IDs and names are different in pool segments.

note

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

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

List of network disk types in all pool segments⁠

IDName
f42f37b2-062f-4ce2-a6b3-28ca5e619030basic.ru-3a
de922498-6af2-4972-840d-36c5e6790b87basicssd.ru-3b
fca113dd-a80f-4996-be54-cf2515d4ddeeuniversal.ru-3a
9c16598e-342b-4ff2-b948-8c05cf8f1490fast.ru-3a
52cb3250-dbea-4ba6-bbde-b5607f1ca545basic.ru-3b
669c3c07-83e3-4e44-8499-d13d379e79eeuniversal.ru-3b
bbc41cd5-d112-4e19-a781-baf44fb690d3fast.ru-3b
0959f227-26c1-46e6-afed-09e040a80af1universal2.ru-3b

Here:

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

View a list of network disk types in a specific pool⁠

  1. Open the OpenStack CLI.

  2. Check out the list of types:

    openstack volume type list

    Example answer 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      |
    +--------------------------------------+-----------------+

    Here:

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

Cost⁠

Network disks are billed under the cloud platform payment model.

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

You can view the size of the network disk in the Control Panel: from the top menu, click Products → Cloud Servers → Disks section → Disk row → Size column.

For SSD Universal v2 network drives, the number of IOPS used is also charged. The maximum number of IOPS per hour is taken into account. The first 2,000 IOPS are free of charge. The number of IOPS can be viewed in the control panel: in the top menu, click Products → Cloud Servers → Disk section → Disk page → Settings tab.

The cost of one GB (for all types of network disk) and one IOPS (for SSD Universal v2 type disks) can be viewed at selectel.ru.