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To replace drive in RAID5/6 array, you need to read the entirety of every drive To replace drive in RAID1 you need to read the entirety of one drive. Instead
by ilyt 3y ago
To replace drive in RAID5/6 array, you need to read the entirety of every drive
To replace drive in RAID1 you need to read the entirety of one drive.
Instead of reading one whole drive worth of stress, you're reading N drives worth of stress
But it is funny that the people making arguments about "stressing drives" don't even fucking know how RAID works...
- edmundsauto 3y agoHowever, RAID1, you stress the drive that has your only copy of the data. With 5/6 (RAIDz w/ 2 spares as well) you can have multiple copies of the data, so although you are overall increasing stress on your fleet, wouldn't it have a lower probability of data loss? Drive stress (for me) is mostly a concern about data loss.
- ilyt 3y agoWith RAID5 you'd have higher probability of data loss. Remember, you just loss the only redundancy you had, brining your redundancy to same level as RAID1 with failed drive. ... except now you have more drives that can fail. With RAID6 yes, you can still fail one more time and still keep your data, which is why it is recommended. Data safety wise I'd go RAID6 -> RAID1/10 (particularly linux implementation can do raid10 on odd number of drives which is nice) -> RAID5