Service plans

Physical storage solution

Currently STACKIT uses only high-quality SSD hard disks in the Block Storage Service, which results in very good performance.

The provision of inexpensive HDD hard disks is also planned for the future. The distinction between the hard disk types can be made on the basis of the naming:

• Standard → HDD
• Premium → SSD

Single vs Metro AZ

Block Storage is offered in multiple performance classes. All of them are available both for Single Availability Zone (Single AZ) and Metro Availability Zone (Metro) setup.

Single Availability Zone (Single AZ) setup implies fixed assignment to one Availability Zone. Data in a Single AZ are not mirrored across different Availability Zones.

Metro AZ setup means fixed assignment to a region, but no fixed assignment to an Availability Zone. Data in Metro Setup are automatically mirrored across two different Availability Zones.

Performance classes and characteristics

Performance class is defined by performance characteristics, in case of Block Storage it is a combination of IOPS per second and throughput per GB. Performance class is independent of the volume size and can be applied to any available capacity.

Please note: Performance classes refer to the corresponding storage in total, i.e., independent of the access method. This means that read accesses from the virtual machine and backup read accesses, for example, are also handled within the same performance class (i.e., VM and backup share IOPS and throughput).

While creating a volume you can select a performance class.

Currently available Service Plans (performance classes)

The following table lists currently available performance classes for the EU01 region:

Performance class	Name	Max. IOPS	Max. Throughput (MB/s)
Performance class 0	storage_premium_perf0	120	25
Performance class 1	storage_premium_perf1	500	50
Performance class 2	storage_premium_perf2	1000	100
Performance class 4	storage_premium_perf4	2000	150
Performance class 6	storage_premium_perf6	5000	200
Performance class 8	storage_premium_perf8	10000	250
Performance class 10	storage_premium_perf10	15000	300
Performance class 12	storage_premium_perf12	20000	350
Performance class 13	storage_premium_perf13	20000	700
Performance class 14	storage_premium_perf14	25000	400
Performance class 15	storage_premium_perf15	25000	800
Performance class 16	storage_premium_perf16	30000	450
Performance class 17	storage_premium_perf17	30000	900
Performance class 18	storage_premium_perf18	35000	500
Performance class 19	storage_premium_perf19	35000	1000
Performance class 20	storage_premium_perf20	40000	550
Performance class 21	storage_premium_perf21	40000	1100

IOPS - Input/Output Operations per second

Throughput - Throughput in Megabytes per second

Thus, the classes used can be distinguished in detail based on the naming. Example: “Block Storage Premium - Performance Class 2” corresponds to SSD hard disks with max. 1000 IOPS and max. 100 Mbyte/s throughput.