Limitations

The following are a few limitations that you can encounter while using Block Storage:

• We guarantee operation for the selected operating systems until the vendor or upstream support is available.
• Microsoft Windows Server versions are also supported until vendor support is available. For more information, see Prerequisites.
• The following volume minimum and maximum values apply based on the storage type.

Storage Volume	Essential	Balanced	Performance
Minimum size per volume	1 GB	1 GB	1 GB
Maximum size per volume	4 TB	4 TB	4 TB
Maximum Read/write speed, sequential	200 MB/s (static per instance)	300 Mb/s per volume at 1 MB block size	600 Mb/s per volume at 1 MB block size
Maximum Read speed, full random	1,100 (static per instance)	24,000 IOPS at 4 KB block size and minimum 2 Cores, 2 GB RAM per volume	45,000 IOPS at 4 KB block size and minimum 4 Cores, 4 GB RAM per volume
Maximum Write speed, full random	1,100 (static per instance)	18,000 IOPS at 4 KB block size and minimum 2 Cores, 2 GB RAM per volume	30,000 IOPS at 4 KB block size and minimum 4 Cores, 4 GB RAM per volume

Larger volumes can be made available on request. For more information, contact IONOS CLOUD Support.