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Disks
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Disks

Local and network disks can be used in the PostgreSQL cloud database cluster. The type of disk used depends on the configuration line selected.

You can select the configuration lineup with the desired disk type and disk size when creating a cloud database cluster. After the cluster is created, you can change the lineup to another lineup with the same disk type and increase the disk size — scale the cluster.

You can see the performance and throughput of the disks in different line configurations in the Performance and Throughput table.

Local disks

Configuration lines
  • Standard;
  • CPU;
  • Memory;
  • HighFreq;
  • Dedicated;
  • Flex
Disk typeSSD NVMe disk
Technical features The disk subsystem is configured in RAID 1 for the Dedicated line and RAID 10 for the Standard, CPU, Memory, HighFreq and Flex lines
AdvantagesLow latency of data access
UtilizationSuitable for tasks that are sensitive to read and write speeds
Number of disks in the DBMS1
Configuration change
  • in all configuration lines with local disk, except Flex, you can't increase only local disk, you can change the whole configuration of nodes — scale the cluster;
  • You can change the local disk configuration lineup to a network disk lineup only during cluster recovery.
Disconnecting the disk
Connecting to another database
Create another disk, snapshot or backup
DeletionDeleted with all data when the cluster is deleted

Network disks

Configuration linesFlex
Disk typeSSD NVMe disk
Technical featuresManaged by Software-Defined Storage (SDS) — Ceph
Advantages
  • triple replication of disk volumes;
  • network disk size is independent of the number of vCPUs
UtilizationNot recommended for systems that are sensitive to network latency and response time (latency). For example, suitable for archival data storage
Number of disks in the DBMS1
Configuration change
  • there is no down time when changing the disk size;
  • when changing the number of vCPUs and RAM, the down time depends on the number of nodes in the cluster: in single-node clusters the down time is equal to the time of rebooting a node (one or two minutes), and in multi-node clusters — to the time of switching to another node (less than one minute);
  • You can change the configuration lineup with a network disk to the local disk lineup only during cluster recovery
Disconnecting the disk
Connecting to another database
Create another disk, snapshot or backup
DeletionDeleted with all data when the cluster is deleted

Performance and throughput

To see a list of available configurations, see the Versions and Configurations manual.

Disk performance and throughput in all line configurations except the Flex line depends on disk size.

Disks
up to 256 GB
Disks
512 GB
Disks
768 GB.
Disks
1 TB
Disks
1.5 TB
Disks
2 TB.
Throughput400 MB/s.500 MB/s600 MB/s700 MB/s.800 MB/s900 MB/s.
Performance (reading)25,600 IOPS40,000 IOPS50,000 IOPS60,000 IOPS70,000 IOPS80,000 IOPS
Performance (recording)12,800 IOPS20,000 IOPS25,000 IOPS30,000 IOPS35,000 IOPS40,000 IOPS