A Linux administrator receives a call from the network operations team that one of the database applications is down on a Linux server. The Linux server is configured with RAID 1 for redundancy, and…

Question

Exhibit

Options

• Amdadm /dev/md0 --remove /dev/sdb1
• Bmdadm /dev/sdb1 --fail /dev/md0
• Cmdadm /dev/md0 --fail /dev/sdb1
• Dmdadm /dev/sdb1 --remove /dev/md0
• Eracadm --remove /dev/sdb1
• Fracadm --fail /dev/sdb1

• A
  72% (26)
• B
  3% (1)
• D
  6% (2)
• E
  14% (5)
• F
  6% (2)

Explanation

Removing a failed drive from a Linux software RAID array managed by mdadm requires two sequential steps. First, the device must be marked as faulty using 'mdadm /dev/md0 --fail /dev/sdb1' (Choice C) - this tells the RAID array that the drive has failed, even if mdadm hasn't already marked it as such automatically. Second, the device is removed from the array using 'mdadm /dev/md0 --remove /dev/sdb1' (Choice A) - a device cannot be removed unless it is first in a failed state. In both commands, the array device (/dev/md0) is specified first as the target, followed by the member device (/dev/sdb1). Choices B and D have the arguments reversed, which is invalid syntax. Choices E and F reference 'racadm', which is a Dell-specific remote management tool unrelated to Linux software RAID.

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