Open Telekom Cloud 2020 - FIO IOPS

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Block storage performance is a crucial metric for any infrastructures storing large amount of structured data. Most of the databases stored on volume are mainly limited by the number of I/O per second the device can achieve in read and write mode.

To collect IOPS, Cloud Mercato makes usage of Flexible I/O Tester (FIO) with a configuration designed to highlight the IOPS value:

• Block size: Small size of 4KB essentially stressing block handling not bandwidth
• Access: Read and write not mixed
• Mode: Random avoiding computable optimisation
• No file system: Only infrastructure performance are relevant
• Miscellaneous: We avoid most as possible buffers and cache

Above VM performance, Cloud providers also apply various methods to throttle IOPS depending:

• AWS General Purpose SSD:
  • IOPS are directly linked to volume's size
  • Performance are burstable and won't be at their maximum 100% of the time
• Google Persistent SSD:
  • IOPS are directly linked to volume's size
• Azure No cache Premium LRS:
  • IOPS are directly linked to the the sum of all volumes' size owned by tenant
  • Performance depends of VM flavor
  • No cache option has been used