I was trying to put gentoo on a dell poweredge 1950 quadcore xeon machine
with three disks connected to a lsi PERC 5/i raid controller.  In the BIOS
settings, all three disks were added to the controller for a RAID5 set up.
 When I boot from LiveCD (2008 version with 2.6.24-r5 kernel) with
dmraid='-ay' option, it came up not recognizing the RAID set, as I only saw
"control" under /dev/mapper.  modprobe megaraid was okay, so was modprobe
raid5.  Under /dev, I only saw sda, but there was no sdb, sdc.  So it looked
like there was only one disk but the system did not recognize it as a raid
set.  Booting from LiveCD with dmraid='-ay' doscsi didn't help.  I got the
same result.  If I did a dmraid -ay in bash, I got "No RAID disks".  Could
anyone point me to some instructions on how to make Gentoo recognize the
PERC 5/i RAID controller?

I tried both 32bit and 64bit gentoo and results were the same.

lspci showed:
02:0e.0 RAID bus controller: Dell PowerEdge Expandable RAID controller 5

dmesg showed:
megaraid cmm: 2.20.2.7 (Release Date: Sun Jul 16 00:01:03 EST 2006)
megaraid: 2.20.5.1 (Release Date: Thu Nov 16 15:32:35 EST 2006)
megasas: 00.00.03.10-rc5 Thu May 17 10:09:32 PDT 2007
megasas: 0x1028:0x0015:0x1028:0x1f03: bus 2:slot 14:func 0
ACPI: PCI Interrupt 0000:02:0e.0[A] -> GSI 78 (level, low) -> IRQ 17
megasas: FW now in Ready state
scsi4 : LSI Logic SAS based MegaRAID driver
scsi 4:0:0:0: Direct-Access     SEAGATE  ST973402SS       S206 PQ: 0 ANSI: 5
scsi 4:0:1:0: Direct-Access     SEAGATE  ST973402SS       S206 PQ: 0 ANSI: 5
scsi 4:0:2:0: Direct-Access     SEAGATE  ST973402SS       S206 PQ: 0 ANSI: 5
QLogic Fibre Channel HBA Driver
scsi 4:0:8:0: Enclosure         DP       BACKPLANE        1.05 PQ: 0 ANSI: 5
scsi 4:2:0:0: Direct-Access     DELL     PERC 5/i         1.03 PQ: 0 ANSI: 5
scsi 4:0:8:0: Attached scsi generic sg1 type 13
sd 4:2:0:0: [sda] 284164096 512-byte hardware sectors (145492 MB)
sd 4:2:0:0: [sda] Write Protect is off
sd 4:2:0:0: [sda] Mode Sense: 1f 00 10 08
sd 4:2:0:0: [sda] Write cache: disabled, read cache: disabled, supports DPO
and FUA
sd 4:2:0:0: [sda] 284164096 512-byte hardware sectors (145492 MB)
sd 4:2:0:0: [sda] Write Protect is off
sd 4:2:0:0: [sda] Mode Sense: 1f 00 10 08

Thanks very much for your help!



-- 
-hoki