Physical Memory Capacity Management
Cisco supports memory expansion on Azure Stack Hub servers. Memory expansion is a disruptive operation, and involves shutdown of the Azure Stack Hub system. Following are the guidelines for memory expansion or upgrade:
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All the servers in the Azure Stack Hub have homogeneous hardware configuration. For this reason, you cannot perform memory upgrade only on a single server. You must upgrade the memory on all the servers at the same time.
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Upgrade only to increments supported for M5 — 384 GB, 512 GB and 768 GB using 32 GB DIMMS, 1024 GB or 1536 GB using 64 GB DiMMS.
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You cannot mix and match 32 GB and 64 GB DIMMS
Review the Cisco memory expansion best practices from following links:
https://www.cisco.com/c/en/us/td/docs/unified_computing/ucs/c/hw/C240M4/install/C240M4/replace.html
After supported memory is procured, follow the instructions from the following Microsoft guide to perform the memory expansion: