A mirror only lets you use one disk in a stack in usable space (50%, or less if for some reason you want a double redundant mirror, i.e. three disks). A RAID-Z depends on the amount of parity disks.

Broadly speaking, however, when an all-flash array is a legacy product that’s been retrofitted with flash capacity then you find Raid levels that span the possible combinations of mirroring ...

Since the dawn of computing, long-term mass storage has been a primary factor in the design of systems. At issue is speed, density of storage, and of course, fault recovery.

I'm watching the OS build a RAID-1 array on a Win2k-AS box. It started generating the mirror ~11 hours ago; it's currently 90% complete. That works out to about 5 MBps. Which seems rather slow for ...