Don't do that for anything critical. Manage mdraid yourself. It's a whole lot more predictable, manageable, and debuggable than an opaque abstraction. Example:

Don't do that for anything critical. Manage mdraid yourself. It's a whole lot more predictable, manageable, and debuggable than an opaque abstraction. Example: I have 5 XFS volumes across 45 drives on a 4U NAS box with 1 cold spare. Granted, I probably should've chopped them up with a single-box hypervisor RAIDless Ceph cluster of VMs in retrospect.