Am 03.05.2020 um 07:44 schrieb Caveman Al Toraboran:
* RAIDs 4 to 6: fails to satisfy point (3)
since they are stuck with a fixed tolerance
towards failing disks (i.e. RAIDs 4 and 5
tolerate only 1 disk failure, and RAID 6
tolerates only 2).
As far as I remember there can be spare drives / partitions which will
replace a failed one if needed. But this does not help if drives /
partitions fail at the same moment. Under normal conditions spares will
rise the number of drives which can fail.
Nothing you asked but I had very bad experience with drives which spin
down by themselves to save energy (mostly titled green or so).
Also there has been some talk about SMR
https://hardware.slashdot.org/story/20/04/19/0432229/storage-vendors-are-quietly-slipping-smr-disks-into-consumer-hard-drives
