I have a system with pre configured hardware RAID. It has 2 disks in a RAID1 configuration. It has a further 6 disks in a RAID5 configuration. The 6 disk RAID5 is split (by the hardware) to look like 2 separate disks:
/dev/sda - RAID1 2x discs /dev/sdb - RAID5 6x discs (half of each disk) /dev/sdc - RAID5 6x discs (half of each disk)
I have an lvm physical volume for each of the above. I am considering adding PV /dev/sda and PV /dev/sdb, and possibly /dev/sdc to the same volume group.
To my naive view of LVM/RAID, this is looks like logical volumes would be backed by a mixture of RAID5 and RAID1. What are the risks, ineffciencies or management difficulties with this approach ?