I have successfully installed C7 on a Supermicro server equipped with two system SAS HDDs attached to an LSI MegaRAID SAS 8208ELP controller, and configured as RAID1 device. The installer showed it as a BIOS RAID device with a long name ddf1_..., I was able to create partitions, everything seemed OK.
To my surprise, after rebooting into installed system, 'df -l' shows the partitions as single-disk devices:
# df -l
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/sdc3 20469760 3995036 16474724 20% /
[...]
/dev/sdb1 204850456 32928 204817528 1% /export/scr
Still, 'dmraid' shows the RAID as active and OK:
# dmraid -r
/dev/sdc: ddf1, ".ddf1_disks", GROUP, ok, 583983104 sectors, data@ 0
/dev/sdb: ddf1, ".ddf1_disks", GROUP, ok, 583983104 sectors, data@ 0
# dmraid -s
*** Group superset .ddf1_disks
--> Subset
name : ddf1_4c5349202020202010000055000000004711471100001450
size : 583983104
stride : 128
type : mirror
status : ok
subsets: 0
devs : 2
spares : 0
Also, 'fdisk -l' show identical partitioning of both disks, suggesting that it was really done on a "mirrored device".
Is that OK? Do I have those partitions mirrored or not?
On all other machines I use with BIOS RAID (other hardware), the system partitions are reported as mounted on /dev/md127pX, as I would expect.
regards, Michal.