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Old 09-18-2006, 10:57 AM   #1
Registered: Aug 2002
Location: Atlanta
Distribution: Redhat Linux 7.2 & 7.3 + 8.0
Posts: 59

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New to RAID

So I recently acquired a Dell Poweredge 1800 with two 250GB hard drives and installed Redhat AS 4 on this bad boy.

I used the Dell RAID controller to create a hardware RAID 1 on the system before installing Linux. Everything works great and it identifies the RAID 1 when the computer posts.

However in linux, all I see is sda under dev. It shows all the correct partitions and all but shows me no evidence of the second drive being there. I am just curious, with hardware raid, does the raid controller take care of it in the background so the OS doesnt see the the other drives?

Just curious. I don't want to wait for a drive to die only to find out That the RAID is not working.

Thanks for all the help.


Last edited by kofi; 09-18-2006 at 11:02 AM.
Old 09-18-2006, 11:41 AM   #2
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Registered: Sep 2004
Distribution: RHEL AS3, AS4 / Vector
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reboot your system and when prompted, go into the disk management.
if you look under the manage disks option, you can see your raid devices and their health status.

see for a good raid info page.
Old 09-18-2006, 01:38 PM   #3
Registered: Dec 2005
Location: "The South Coast of Texas"
Distribution: Slackware64-current
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So, what's supposed to be wrong? Linux will see a RAID 1 array as one disk. Be worried if it shows more than one. As EdR said, check the RAID BIOS, as you are booting, to get info on individual disks.
Old 09-18-2006, 03:11 PM   #4
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Location: Northeast Ohio
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You could always consult Dells site for Management utilities that may allow you to view the status of your system and array from within Linux...

And since RHEL is supported by Dell, chances are good the packages you need will be a simple download away..

Management Utility

    * perc-cerc-apps-6.03-A06.tar.gz includes Dellmgr-5.31, linflash-3.01, Megamon-4.0-0a, percsnmp-4.09-1 (Search for R71524).
    * Older releases
          o lin_apps_a04.tar.gz includes dellmgr 5.22, linflash 2.14, megamon 3.6, and percsnmp-4.06. (Search for R49828).
          o CERC_LinApps-5.22.tar.gz includes dellmgr 5.22, linflash 2.10, megamon 3.6, and percnmp 4.06. This is a useful set of utilities for managing, monitoring, and upgrading your controller.
          o megaraid-CERC_ATA100.tar.gz includes dellmgr 5.16, linflash 2.05, megamon 3.0, megarac 1.00 and percnmp 4.02.
          o megaraid-util-rh7.3.tar.gz includes dellmgr 5.11, megaflash 2.01, megamon 2.6, and megaraid-snmp 3.00. This is a useful set of utilities for managing, monitoring, and upgrading your controller.
          o dellmgr-5.11-1.tar.gz same as in the above RPM, in .tar.gz format. By popular request. To preserve the path, extract as: tar -Pxvzf dellmgr-5.11.1.tar.gz
          o DellMgr v5.07a for PERC 3/SC, 3/DCL, 3/DC, 3/QC, 2/SC, 2/DC
          o megamgr management utility for PERC 2/SC, 2/DC (depreciated)
Old 09-18-2006, 05:41 PM   #5
Registered: Aug 2002
Location: Atlanta
Distribution: Redhat Linux 7.2 & 7.3 + 8.0
Posts: 59

Original Poster
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Thanks guys... you have been very helpful.. .. I did your suggestions and all is well. I guess I wanted to make sure.. that the RAID was infact working and not to assume.



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