Installation failure with md/raid

Looks like issue might be because I am mirroring both /boot and / root.
Two disks sda & sdb
Any suggestions?
Two disks sda & sdb
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kernel: md: bind <sda2>
kernel: md/raid1:md1 active with 2 out of 2 mirrors
kernel: md1: detected capacity change from 0 to 10724573184
kernel: md1: unknown partition table
systemd[1]: Job dev-md0.device/start timed out
systemd[1]: Timed out waiting for device dev-md0.device.
Subject: Unit dev-md0.device has failed
Any suggestions?