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SK0-003 · Question #519

A file server is setup in a RAID 5 configuration. Recently there was a power failure in the server room while a user was transferring a document from one drive on the server to another drive on the…

The correct answer is C. Install a battery backed write cache module in the system. To prevent data corruption during unexpected power outages on a file server, especially when a UPS is unavailable, installing a battery-backed write cache module is the most effective solution.

Security and disaster recovery

Question

A file server is setup in a RAID 5 configuration. Recently there was a power failure in the server room while a user was transferring a document from one drive on the server to another drive on the same server. Unfortunately their UPS was in repair during this outage, and the file is now corrupt. Which of the following can be done to prevent this situation in the future?

Options

  • AIncrease the memory on the server.
  • BReconfigure drives to a RAID 0+1.
  • CInstall a battery backed write cache module in the system.
  • DInstruct the user to save to the local system instead of to the server.

How the community answered

(49 responses)
  • A
    12% (6)
  • B
    4% (2)
  • C
    78% (38)
  • D
    6% (3)

Why each option

To prevent data corruption during unexpected power outages on a file server, especially when a UPS is unavailable, installing a battery-backed write cache module is the most effective solution.

AIncrease the memory on the server.

Increasing server memory (RAM) might improve general performance but does not protect data stored in the RAID controller's write cache from loss during a power outage.

BReconfigure drives to a RAID 0+1.

Reconfiguring to RAID 0+1 (striping with mirroring) offers redundancy against drive failures but does not inherently protect data in the controller's write cache from power loss without a BBWC.

CInstall a battery backed write cache module in the system.Correct

A battery-backed write cache (BBWC) module on a RAID controller protects data held in volatile cache memory during a power failure by providing temporary power. This allows the cached data to be written safely to the disk array once power is restored or before the battery fully drains, thereby preventing data loss and corruption from incomplete write operations.

DInstruct the user to save to the local system instead of to the server.

Instructing users to save locally is a procedural change that shifts the problem to the client, rather than a technical solution that protects the server's data integrity during power outages.

Concept tested: Data integrity protection with RAID controllers during power loss

Source: https://www.intel.com/content/www/us/en/support/articles/000005708/server-products.html

Topics

#RAID#Data integrity#Power loss protection#BBWC

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