I exercise myself to raid with debian and i have tested to remove one disk to see how debian react. at boot screen lock for 10 ~ 15 sec and going the initramfs shell Vmware in RAID1 or Server SCSI drive RAID1 (MBR) test with jessie 8.1 netinst in i386 or amd64 No problem with wheezy 7.8 netinst