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-5 OK - - - 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.
