dmraid -r" just returns No RAID disks

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I have installed centOS 5 on our HP Proliant ML110 GH6 server and configured the Smart Array through BIOS

Now, i would like to set up an e-mail notification with the RAID status (especially if it's failed). When I searched through the packages available I found this one:

"dmraid-events-logwatch-1.0.0.rc13-63.el5.x86_64 - dmraid logwatch-based email reporting"

which is basically what I need.

So I installed it & I searched regarding this dmraid tool & found this "dmraid -r" command which gives you the details of your RAID.

Unfortunately mine gives me "No RAID disks".

I also went over this https://help.ubuntu.com/community/FakeRaidDebug but I got stuck when it tells you to try & find the metadata yourself :/

Any help is much appreciated!!

Result of "fdisk -l":

Disk /dev/sda: 500.1 GB, 500107862016 bytes 255 heads, 63 sectors/track, 60801 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1          13      104391   83  Linux
/dev/sda2              14       60801   488279610   8e  Linux LVM

Disk /dev/sdb: 500.1 GB, 500107862016 bytes 255 heads, 63 sectors/track, 60801 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1   *           1       60801   488384001   8e  Linux LVM

hex4

Posted 2011-07-15T08:04:35.487

Reputation: 101

2I may be completly wrong but your not using fake raid your using real RAID, So wouldnt the OS just see this a single disk. Im not definite on this as I heard that some "Hardware Raids" arnt actually the real thing. – squareborg – 2011-07-15T08:16:39.427

@Steve Martin - I'm not really an expert regarding RAID types (fake, hardware, software) so I just searched over the internet to find some help and that's one of the links I found. I don't think that the OS is actually seeing 1 disk because I can both check hdparm -I /dev/sda & hdparm -I /dev/sdb – hex4 – 2011-07-15T08:32:33.737

I had a conversation with a friend a couple months ago and he was saying that linux sees through a "Fake Hardware" and will show 2 disks where as windows would show just one disk, Can you post the output of fdisk -l (as super user) – squareborg – 2011-07-15T08:41:02.187

question updated – hex4 – 2011-07-15T08:46:24.740

Steve has hit the nail on the head - the Proliant Smart Array Controller is managing the array and presenting a 'disk' to CentOS, so there's nothing for dmraid to see. You might have some luck with the tools on the following page, but the drivers are allegedly being deprecated. http://cciss.sourceforge.net/

– Linker3000 – 2011-07-15T12:11:00.310

If the Proliant Smart Array Controller is doing the job, how come when I load the HP ACU (Array Configuration Utility) it's telling me 'No Controller found'? – hex4 – 2011-07-15T14:09:48.107

Answers

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There are three kinds of RAID atm:

  1. Real hardware RAID cards, which need their own driver and show a single disk to the OS. Forexample a smartarray in an HP.
  2. Software RAID. E.g. md under Linux.
  3. Fake RAID (which is software RAID with some assitance from the BIOS). Example IRST which is detected as dm under Linux.

The tools you installed are for this dmraid while you are using a smartarray hardware RAID controller. This is why the tool finds my fake RAID installations and why you get this error.

Hennes

Posted 2011-07-15T08:04:35.487

Reputation: 60 739

Asked: 2011-07-15T08:04:35.487

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Active: 2016-08-10T15:59:13.913