1Z0-997-26 Workload Migration Practice Question
Your engineering team is troubleshooting an issue where migrated Linux virtual machines in OCI are experiencing severe disk I/O performance bottlenecks. The instances were migrated using raw block-level cloning from on-premises SAN storage. The volumes in OCI are provisioned as Lower Cost (Balanced) block volumes. What action should you take to resolve the performance bottleneck while maintaining data integrity?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Modify the OCI block volume performance tier or increase the assigned Volume Performance Units (VPUs) per GB.
OCI Block Volume service offers different performance tiers: Balanced, Higher Performance, and Ultra High Performance, alongside customizable VPU (Volume Performance Units) scaling. Upgrading the VPUs or switching the volume performance tier directly increases IOPS and throughput without requiring data re-migration.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Format the attached block volumes with ext3 file systems instead of ext4.
Why it's wrong here
ext3 is an older file system and will not improve block-level I/O throughput provided by the storage layer.
- ✗
Recreate the virtual machines using denser AMD compute shapes with local NVMe storage.
Why it's wrong here
While local NVMe offers high performance, local NVMe is ephemeral and data does not persist across reboots, making it unsuitable for persistent OS/data disks without application-level replication.
- ✓
Modify the OCI block volume performance tier or increase the assigned Volume Performance Units (VPUs) per GB.
Why this is correct
Increasing VPUs or changing performance tiers dynamically scales IOPS and throughput to match workload requirements.
- ✗
Attach an OCI File Storage Service (FSS) mount target as the primary root volume.
Why it's wrong here
FSS is designed for shared file storage (NFS), not as a high-performance root operating system boot volume for Linux VMs.
Visual reference
About these practice questions
Courseiva writes every 1Z0-997-26 question from scratch — 344 in total, each with an explanation and a wrong-answer breakdown. None are copied from real exams or dumps. Learn why practice questions differ from exam dumps →
JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed August 2026 · checked against the official Oracle exam blueprint
This 1Z0-997-26 practice question is part of Courseiva's free Oracle certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 1Z0-997-26 exam.