Hi,
I'm testing Storage Space on Windows 2012 R2 at the moment and I'm a bit puzzled with disk redundancy.
I have a server with 24 SATA disks attached through a JBOD controller (1 enclosure).
I then create a storage pool across all 24 disks and create a two-way mirrored virtual disk on top of that.
My understanding is that, when using a two-way mirror with 2 to 4 disk, only one disk can fail without impacting the virtual disk.
If, however, the total disks increases to 5, 2 disks can fail.
In my lab (24 disks), I would expect to, at the very least, be able to loose 2 disks without any impact, but unfortunately, that's not the case.
As soon as I "fail" a second disk, the entire virtual disk goes down!
This doesn't make any sense to me. Surely, with 24 disks, I should be able to sustain more disks failure without impacting the entire virtual disk?
Thanks,
Stephane