[CentOS] mdraid on top of mdraid

Is it possible or will there be any problems with using mdraid on top of mdraid?

specifically say
mdraid 1/5 on top of mdraid multipath.

e.g. 4 storage machines exporting iSCSI targets via two different
physical network switches

then use multipath to create md block devices
then use mdraid on these md block devices

The purpose being the storage array surviving a physical network switch failure.
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