000-221 · Question #79
One disk within a mirrored rootvg volume group failed and was replaced. What is the first action the administrator must take after re-establishing mirroring?
The correct answer is A. Create the boot image on the replaced disk. After replacing a failed disk and re-establishing mirroring in a rootvg volume group, the administrator must first create a valid boot image on the new disk to ensure the system can boot from it.
Question
One disk within a mirrored rootvg volume group failed and was replaced. What is the first action the administrator must take after re-establishing mirroring?
Options
- ACreate the boot image on the replaced disk.
- BRecreate/dev/ipldevice.
- CRe-enable volume group quorum.
- DCopy/dev/hd5 to the new disk.
How the community answered
(47 responses)- A72% (34)
- B2% (1)
- C9% (4)
- D17% (8)
Why each option
After replacing a failed disk and re-establishing mirroring in a rootvg volume group, the administrator must first create a valid boot image on the new disk to ensure the system can boot from it.
Running bosboot on the replacement disk writes a new boot image to the boot logical volume on that disk, making it a viable boot device. Without this step, the system cannot boot from the new disk if the original disk fails again, defeating the purpose of mirroring the rootvg.
Recreating /dev/ipldevice is not a standard post-mirror recovery step and is not required after disk replacement in a mirrored rootvg.
Volume group quorum settings do not need to be re-enabled as a first step after disk replacement and mirroring restoration.
Copying /dev/hd5 directly to the new disk is not the correct method - bosboot must be run to properly write the boot image rather than performing a raw device copy.
Concept tested: AIX rootvg mirror recovery and boot image creation
Source: https://www.ibm.com/docs/en/aix/7.3?topic=b-bosboot-command
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