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Examine this command and output: # mdadm --detail /dev/md0 /dev/md0: Version: 1.2 Creation Time: Tue Oct 27 16:53:38 2020 Raid Level: raid5 Array Size: 207872 (203.03 MiB 212.86 MB) Used Dev Size: 103936 (101.52 MiB 106.43 MB) Raid Devices: 3 Total Devices: 3 Persistence : Superblock is persistent Update Time: Tue Oct 27 16:53:38 2020 State: clean, degraded, recovering Active Devices: 2 Working Devices: 3 Failed Devices: 0 Spare Devices: 1 Layout: left-symmetric Chunk Size: 512K Rebuild Status: 60% complete Name: ol8.example.com:0 (local to host ol8.example.com) UUID: 70f8bd2f:0505d92d:750a781e:c224508d Events: 66 Number Major Minor RaidDevice State 0 8 49 0 active sync /dev/sdd1 1 8 65 1 active sync /dev/sde1 3 8 81 2 spare rebuilding /dev/sdf1 Which two are true?
Correct Answer: B,C
* Option B (Correct):The output shows that the RAID array is in a "degraded, recovering" state, which means one of the devices failed, and the RAID is currently rebuilding with a spare device. When a RAID-5 array is in a degraded state, its read and write performance is reduced because it cannot utilize all disks in parallel, and data is being rebuilt. * Option C (Correct):The output indicates that/dev/sdf1is marked as "spare rebuilding." This implies that a new spare device has been added to the RAID array to replace a previously failed device, and it is in the process of rebuilding to restore redundancy. * Option A (Incorrect):The state of the RAID array is "degraded," which indicates that a RAID device is still being rebuilt. The failed device has not yet returned to normal operating status. * Option D (Incorrect):No extra device was added to increase the RAID set's size. Instead, a spare device was added to replace a failed one. * Option E (Incorrect):Both read and write performance are sub-optimal in a degraded RAID-5 state because data is being rebuilt using the remaining active devices. Oracle Linux Reference:For more information, refer to: * OracleLinux 8: Managing Storage Devices * man mdadmfor details on managing RAID arrays.