A RAID 5 configuration with 20 hard drives loses one hard drive. How many additional hard drive failures can this configuration tolerate before experiencing data loss?
It should be A - 0 hard disk, since it has tolerated a drive failure already, no additional drive can be tolerated.
https://searchstorage.techtarget.com/definition/RAID-5-redundant-array-of-independent-disks
After 2 disks is failed, the array is failed. Is Answer A.
Source: https://www.ibm.com/docs/en/power9/0009-ESS?topic=recovery-raid-5-multiple-disk-failure
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