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Updated: Aug 30, 2026
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IBM C4090-958 Exam Overview:
| Certification Vendor: | IBM |
|---|---|
| Exam Name: | Enterprise Storage Technical Support V3 |
| Exam Number: | C4090-958 |
| Passing Score: | 60% |
| Real Exam Qty: | 73 |
| Related Certifications: | IBM Certified Specialist - Enterprise Storage Sales V3 |
| Available Languages: | English |
| Exam Duration: | 90 minutes |
| Exam Price: | $65 USD |
| Certificate Validity Period: | 3 years |
| Exam Format: | Multiple Choice |
| Recommended Training: | IBM Enterprise Storage Technical Support Training |
| Exam Registration: | Pearson VUE Registration IBM Certification Portal |
| Sample Questions: | IBM C4090-958 Sample Questions |
| Exam Way: | Online proctored or onsite at Pearson VUE test centers |
| Pre Condition: | Recommended 18+ months of experience in enterprise storage technical support; no mandatory prerequisite exams |
| Official Syllabus URL: | https://www.ibm.com/certify/exams/C4090-958 |
IBM C4090-958 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Migration Considerations and Installation Planning | 12% | - Capacity and performance planning - Migration strategies and risk management - Pre-installation assessment and planning |
| Evaluate and Establish Customer Environment and Plans | 37% | - Identify scalability and optimization opportunities - Analyze current customer environment and requirements - Understand storage architecture and terminology - Assess business continuity and disaster recovery needs |
| Apply Product Information | 45% | - Software solutions: Tivoli Storage Manager, storage cloud integration - IBM tape storage systems: TS3500, TS7700, ProtecTIER - Storage technologies: SAN, virtualization, compression, deduplication - Competitive analysis and positioning - IBM disk storage systems: DS8000, XIV, Storwize, N series |
| Installation and Post-Installation Support | 6% | - Verification and validation procedures - Hardware installation and configuration - Remote support and ongoing maintenance |
IBM Enterprise Storage Technical Support V3 Sample Questions:
Question 1
A customer is planning to install two XIV storage systems with synchronous mirroring. The two storage systems will be in separate data centers approximately 50 km apart. The technical specialist has been asked what guidelines should be followed to avoid degraded host I/O.
Which guideline should the technical specialist discuss?
A. the link between sites must support minimum speed of 50 Mbps per FC connection
B. use interval schedule named "Never" to configure the synchronous mirror
C. if a single link is used between sites, then only connect one module per XIV system to each other
D. the link between sites must support the full peak host write rate
Question 2
A customer has a TS3500 Tape Library with LTO-3 drives installed. As part of a hardware upgrade, the drives are being changed to LTO-6. The customer is concerned about reusing the existing media, including already purchased but unused tape cartridges.
What advice should the technical specialist give the customer?
A. Tapes written by LTO-3 drives will not be readable by LTO-6 drives; blank tapes can be formatted for LTO-6
B. Retain the written tapes and a LTO-3 drive for later recovery; blank media will be unusable with LTO-6
C. None of the tape cartridges will be writable, however, the data can still be read by the LTO-6 drives
D. Retain the written tape cartridges for later recovery; the blank media can be used for later writes with a lower capacity than LTO-6 specific cartridges
Question 3
A customer needs to know how many Global Mirror sessions are supported within a single DS8870. Which information source would have this information?
A. DS8870 Redbook
B. DS8870 quick reference guide
C. DSsenes website
D. IBM DS6000 Series website
Question 4
A customer has ordered a TS3500 library with one expansion frame and a total of 16 LTO-6 tape drives. Their requirement is to have redundant connections to the integrated patch panel but they see that there is only one connection available per drive.
What must be configured in order to create the redundancy required?
A. 16 additional fibre channel patch panel cables
B. A third empty expansion frame
C. Second patch panel
D. Replace the patch panel with a 24 port fibre switch
Question 5
What is the function of a T33501J Service Bay?
A. Provides storage for a third replacement robot
B. Provides access to tape drives
C. Provides access to the second tape robot
D. Provides access to tape drive cleaning tapes
Solutions:
| Question 1 Answer: D | Question 2 Answer: C | Question 3 Answer: A | Question 4 Answer: D | Question 5 Answer: B |
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