my setup is sda and sdb are partitioned identically, boot is raid1/ext3,
swap is raid1, root is raid1/lvm/ext4, each raid1 has a partition on sda
and a partition on sdb.

if sda goes south, will centos7 still boot?  it won't work unless the sdb
mbr points to the sdb member of /boot, which means the sdb mbr would not be
an exact copy of the sda mbr.

i kind of expect it to be more simpleminded and less friendly such that it
will only work if sda is removed and sdb becomes addressable as sda.

or perhaps the mbr is smarter than i expect and looks for a UUID, in which
case it would work either way.

has anyone actually tried this in centos7?
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