ultra-disk

name	ultra-disk
description	Configure Ultra Disks for extreme IOPS / low latency workloads

Ultra Disk

When to use this skill

• SAP HANA, top-tier OLTP, large NoSQL with sub-ms tail latency

Key concepts

• Tunable IOPS, throughput, size independently — change live without reboot.
• Requires AZ deployment and a SKU with UltraSSDEnabled capability.
• Charged per provisioned IOPS/MBps and per GiB.
• No host caching — bypasses cache for consistent latency.

Azure CLI examples

az vm create -g rg -n vm-hana --image SLES15-SAP --size Standard_M64s_v2 \
  --zone 1 --ultra-ssd-enabled true

Common pitfalls

• Forgetting --ultra-ssd-enabled true on the VM — can't attach Ultra Disks later without recreate.

References

• Microsoft Learn: search for "Ultra Disk Azure VM" on https://learn.microsoft.com

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