TL:DR: use the second configuration: It is more robust. That is a lot better then in the previous case (which was 4/7th, or 57%). Now the other setup, with a stripe of 4 mirrors.Ĩ5% chance that the array is still working. The chance that a second drive fails in the wrong span is 4/7 th (4 drives left in the working span, each of which can fail) and only 3/7 th that is fails in the span which is already down. If the second drive happens in the other span/stripe: If the drive fails in the the same span/stripe then you have the same result as 1 drive lost. If any drives fails in a stripe then that stripe of lost.ġ drive lost -> Working in degraded mode. Your first setup is a mirrored pair of 4 drive stripes. I think your choice should be obvious after this. Read the part in the link I posted where it states: Match this to your setups (both of them labeled as RAID 10 in your text). Notice the difference between RAID 10 and RAID 01. ![]() ![]() First off all, see this post: What are the different widely used RAID levels and when should I consider them
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