Reliability of raid 10 vs multiple raid 1?

Question

RAID

Hello. Such a noob question is hypothetical. There are 4 SAS disks and a raid controller.
I can build one raid 10 of four disks or 2 raid 1s of two pairs. Advantages and disadvantages other than reliability are not considered.

Is it true that if both disks containing the same data array crash in my raid 10 (for example, both containing block "a" in the picture), then I will lose and will not be able to restore all the contents of the logical disk at all? In this case, in the case of two raid 1, even if both disks in the same array crash, I will only lose half of the data. nothing will happen with the second raid.

Answer 1

1. True.
2.In your question, are 2 raid1 mirrored (raid1 to raid1)? Then you can safely lose 3 discs out of 4 and everything will be fine?
But in the first case, you have 2 times more disk space.

Answer 2

If we are talking about mdadm, we carefully read - If two of the four disks fail in soft-raid10, does the array fall apart in Linux?

Answer 3

maybe easier R6?

Answer 4

Essentially, the situation in your question boils down to a simpler one - two disks that you can
If one disk falls out, then the losses can be estimated as follows:
You can come up with a situation where option 2 is better, but on average for the hospital in option 1 there will be more "useful" data.