When an administrator needs to scale the size of an Oracle database running on Nutanix NDB and originally configured using ASMLib (Automatic Storage Management Library), the most efficient approach is to use NDB's built-in scaling ability to resize existing vDisks. NDB supports dynamic resizing of virtual disks (vDisks) associated with database VMs, allowing the administrator to increase storage capacity without disrupting the database or requiring complex migrations. This method leverages Nutanix's storage integration, resizing the underlying vDisks and updating the ASMLib configuration to reflect the new size, ensuring seamless operation.
* Option A (Leverage the scaling ability built into NDB to resize existing vDisks) is correct as it is the most efficient, native NDB feature for scaling storage.
* Option B (Extend the size by adding new vDisks) is incorrect because adding new vDisks requires additional configuration (e.g., ASM disk group adjustments), making it less efficient than resizing.
* Option C (Create a new, larger database and migrate) is incorrect because migration is time- consuming and unnecessary when resizing is supported.
* Option D (Mount an iSCSI LUN and extend the database onto the new LUN) is incorrect because iSCSI LUNs are not the preferred method in NDB, and resizing vDisks is more integrated.
This approach minimizes downtime and complexity.
References
* Nutanix Database Service (NDB) User Guide, Chapter 4: Managing Database Servers, Section: Scaling Storage for Databases
* Nutanix Support & Insights, Knowledge Base Article: "Resizing vDisks for Oracle Databases in NDB"
* Nutanix Certified Professional - Database Automation (NCP-DB) v6.5 Blueprint, Section 4: Manage Database Servers