[CentOS] mdraid on top of mdraid

[Emmanuel Noobadmin]

> Multipath should survive ONE switch failure and your storage should
> provide a fast raid implementation.

Am I correct to understand that multi-path will survive up to N-1
switch failure and not just one switch if I used more than two
switches? If so, then I can see that I wouldn't need raid on top of
multi-path.
e.g.
Storage Node
-> Disk export as 192.168.1.10, 192.168.2.10 and 192.168.3.10 to 3
different physical switch?


>You'll have really poor performance if you raid over iscsi...
I was pondering over the need of RAID on top of multi-path but wasn't
sure if multi-path alone would be enough.

Would running LVM, for flexibility in expanding volume sizes, on top
of iSCSI be badly affected as well?