Which mdadm command is used to change the RAID level of an existing array from RAID 1 to RAID 5?

mdadm --change /dev/md0 --level=5

mdadm --grow /dev/md0 --level=5

mdadm --reshape /dev/md0 --level=5

mdadm --convert /dev/md0 --level=5

After a power outage, a server fails to boot. The administrator suspects a RAID array issue. The administrator runs mdadm --detail /dev/md0 and sees that the array is inactive. The administrator checks /etc/mdadm/mdadm.conf and finds that the array is not listed. What is the most likely cause and the correct first step to recover the array?

The array is in a degraded state and needs a new disk; replace the failed disk and then assemble.

The array was not assembled because it is not listed in mdadm.conf; run mdadm --assemble --scan to discover and assemble it.

The array metadata is corrupted; run mdadm --create to recreate the array.

The array metadata format is incompatible; use mdadm --examine to check the superblock version and then recreate.

What is a prerequisite for converting a RAID 1 array to RAID 5 using mdadm --grow?

The array must be stopped first

The array must have at least three devices

The array must be empty (no filesystem)

The array must use metadata version 0.90

In a RAID 5 array, what does the 'chunk size' parameter define?

The amount of contiguous data written to a single disk before moving to the next disk

The size of the superblock metadata

The size of the parity block written to each disk

LPI LPIC-3 High Availability and Storage Clusters

Domain 4Objective 2

364.2 Advanced RAID (weight: 2) LPIC-3-HIGH-AVAILABILITY Practice Questions (Page 1)

Part of the Topic 364: Single Node High Availability domain, which makes up ~27% of our current practice bank. Linux Professional Institute does not publish an official question count, but from its 90-minute exam (~35–60 total, ~9–16 in this domain), expect 2–4 from this objective — we provide 27 practice questions to prepare you well beyond it. (estimate)

27questions here

6free pages

10concepts

Questions 1–5

1foundation · easy
Which mdadm command is used to change the RAID level of an existing array from RAID 1 to RAID 5?
Select an answer first
2foundation · easy
Which mdadm metadata format stores the superblock at the beginning of the device and is the default for arrays created with mdadm?
Select an answer first
3expert · hard
After a power outage, a server fails to boot. The administrator suspects a RAID array issue. The administrator runs mdadm --detail /dev/md0 and sees that the array is inactive. The administrator checks /etc/mdadm/mdadm.conf and finds that the array is not listed. What is the most likely cause and the correct first step to recover the array?
Select an answer first
4foundation · easy
What is a prerequisite for converting a RAID 1 array to RAID 5 using mdadm --grow?
Select an answer first
5foundation · easy
In a RAID 5 array, what does the 'chunk size' parameter define?
Select an answer first

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364.2 Advanced RAID (weight: 2) LPIC-3-HIGH-AVAILABILITY Practice Questions (Page 1)

Questions 1–5

Which mdadm command is used to change the RAID level of an existing array from RAID 1 to RAID 5?

Which mdadm metadata format stores the superblock at the beginning of the device and is the default for arrays created with mdadm?

What is a prerequisite for converting a RAID 1 array to RAID 5 using mdadm --grow?

In a RAID 5 array, what does the 'chunk size' parameter define?

Keep studying — Topic 364: Single Node High Availability