@Sasha
often people won’t know that their array has failed and only become aware of it when a drive finally dies… but drives are most often bad long before they die, so people trust their system to keep everything working and then when it breaks its like 1 disk dead and a ½ disk bad, or worn down so much that when the rebuild is started that kicks it over the edge.
raid arrays aren’t backups, they aren’t they are mitigation of the 2% or so odds that a data drive fails… mirror / raid1 is a tank, raid5 is the sports car, raid6 is the SUV, and then raid 0 would be the motorcycle.
either of them will work for what they where intended for, but more often than not when they start to break people don’t notice, if you are running a raid, you should have regular checks of all data, which ensures that, on that day it could all be read within a day and put onto a backup disk…
one should have spare drives on hand, doesn’t have to be perfect… it could be an oversized drive that fits most raid arrays on hand… ofc if you are running a raid 5 and has a spare … then you should be running raid 6 unless if its due to very special performance considerations, and most often that won’t really hold up logical deduction.
@fikros
many of my drives are going to break 10 years of spin time this year…
ofc that cannot keep up forever but thus far quite impressed… but they are enterprise sata drives if memory serves
@Alexey
you really hate raid5 don’t you xD
@Krey
well should have checked the blackblaze data before buying them…
apperently that particular model excels at 30-40% AFR