Does Archera Support Reservations for Azure Storage Disks?

Yes, however, per Microsoft documentation, that disk must meet certain requirements to be considered a "reservable service."

See: Optimize costs for Azure Disk Storage with reservations

Requirements for Reservable Azure Storage Disks

• Must be a regular Premium SSD - Standard SSDs, HDDs and v2 Premium SSDs are not supported
• Must be a Managed Disk - Unmanaged or Blob disks are not supported
• Must be a P30 or larger SKU - 1 TB disk or higher