Ho-Ki Au a écrit :
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!
Your RAID set is being detected by the LiveCD. It looks as though you
have a RAID5 set using 3x72GB drives. This would be consistent with the
size of /dev/sda (144GB). Because it's hardware RAID, operating systems
don't usually access each individual disk but rather the disk set
presented by the controller.
As mentioned by Neil, dmraid is for software RAID management. If you
want to manage your RAID controller or disk sets from Linux, you'll have
to find management software capable of doing this. Try the server
manufacture's site or the RAID manufacture's web site to see if such
software exists.
Hope that helps,
Carlos
