Re: [gentoo-user] LiveCD installation not recognizing megaraid RAID set
On Mon, 27 Jul 2009 16:45:28 +0800, Ho-Ki Au wrote: 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, dmraid is for software RAID. If you have a hardware RAID controller, you should just see the single device presented by the controller, not the three individual disks. -- Neil Bothwick If the pen is mightier than the sword, and a picture is worth a thousand words, how dangerous is a fax? signature.asc Description: PGP signature
Re: [gentoo-user] LiveCD installation not recognizing megaraid RAID set
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 :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 BACKPLANE1.05 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
Re: [gentoo-user] LiveCD installation not recognizing megaraid RAID set
It took Carlos' reply for me to reread make sense of the original
post.
On 27 Jul 2009, at 11:46, Carlos wrote:
Ho-Ki Au a écrit :
... In the BIOS settings, all three disks were added to the
controller for a RAID5 set up. ... 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.
It looks like *not only* did you add them to the controller, but you
configured them as a single drive. Therefore this looks correct.
The whole point of RAID is that multiple disks should appear to the
host o/s as a single drive.
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.
A Google for PERC5 Linux reveals:
http://blog.gtuhl.com/2009/03/11/monitoring-dell-perc5-and-perc6-disks-in-arch-linux/
Then searching Portage:
$ eix sys-block/mega
* sys-block/megacli
Available versions: ~1.01.40!m!s!t ~2.00.15!m!s!t ~4.00.11!m!s!t
Homepage:http://www.lsi.com/
Description: LSI Logic MegaRAID Command Line Interface
management tool
* sys-block/megactl
Available versions: ~0.4.1
Homepage:http://sourceforge.net/projects/megactl/
Description: LSI MegaRAID control utility
* sys-block/megamgr
Available versions: ~5.20!m!s!t ~5.20-r1!m!s!t
Homepage:http://www.lsi.com
Description: LSI Logic MegaRAID Text User Interface
management tool
* sys-block/megarc
Available versions: ~1.11!m!s!t {doc}
Homepage:http://www.lsi.com
Description: LSI Logic MegaRAID Text User Interface
management tool
Found 4 matches.
$
Viewing the RAID using the correct LSI utility should show the
individual drives.
I use the tw_cli for my 3ware controller. This is how it it appears on
my system (the LSI utility will have a different name syntax):
$ sudo tw_cli /c0/u1 show
Unit UnitType Status %RCmpl %V/I/M Port Stripe Size(GB)
u1 RAID-5OK - - - 64K 931.303
u1-0 DISK OK - - p4- 465.651
u1-1 DISK OK - - p5- 465.651
u1-2 DISK OK - - p6- 465.651
$
Stroller.
