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Old 12-12-2008, 04:02 AM   #1
Registered: Dec 2008
Location: Athens
Distribution: Centos Ubundu RedHat
Posts: 38

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iscci disks support

I have just installed Centos 5.2 in a DELL PowerEdge 2970.
It has hardware raid builtin, which I didn't configure at installation time.
My current setup is
/dev/sda disk with three partitions /dev/sda1 /boot , /dev/sda2 /swap , /dev/sda3 / , and ofcourse my root is on vg00 and it has seperate partitions for /root, /home, /var, /usr.
My Disks are
/dev/sda 73GB
/dev/sdb 73GB
/dev/sdc 450GB
/dev/sdd 450GB
For the time being I can only see configured /dev/sda.
When I do fdisk -l It doesn't see any of the other drives. I can tel that my three partions on /dev/sda are mirrored in /dev/sdb because If I take one of the drives of I can still boot normaly which means that mirroring is on.
Now my question is how can i see the other two drives and configure them?
What is the command/s for hardware raid?
By the way is there support for iscsi devices in Centos 5.2 or I need to download drive?
When I run dmraid -l I get
asr : Adaptec HostRAID ASR (0,1,10)

Desired Configuration that I want to end up with is:

/dev/md0 raid1 with membership of /dev/sda1 and /dev/sdb1 (boot )
/dev/md1 raid1 with membership of /dev/sda2 and /dev/sdb2 (root on both)
/dev/md2 raid1 with membership of /dev/sdc1 and /dev/sdd1 (root )
Old 12-13-2008, 09:53 AM   #2
Registered: Feb 2008
Location: Texas
Distribution: Fedora, RHEL, CentOS
Posts: 488

Rep: Reputation: 78
I believe the PowerEdge Expandable Raid Controller (PERC) will be either a PERC5 or PERC6, which you can enter by pressing Ctrl-R during POST when the PERC is initializing (you should see it on the screen what to press). Once in the PERC BIOS you can allocate any available physical disk storage to a virtual disk (create a new array) so that it is presented to the OS as available storage. The PERC masks any available physical disk storage from the OS until it is added to a virtual disk in the controller. Dell has tools that allow you to manage it in the OS (see: Repository/OMSA for more information) as well.

I'm guessing here but it is likely that what you call sda and sdb are physical disks (pd0 and pd1) that are mirrored in the controller bios and presented to the OS as sda. As far as configuring pd2 (sdc) and pd3 (sdd), it is a matter of entering the raid controller during POST and creating a virtual-disk (?mirror?) out of the two unallocated disks and then that new virtual-disk should appear to the OS as sdb for your use.

Dell™ PowerEdge™ 2970 Systems

RAID Controllers
Dell™ PowerEdge™ Expandable RAID Controller 5/i and 5/E
Dell™ PERC 6/i, PERC 6/E, and CERC 6/i Controllers

iSCSI support should be provided by the iscsi-initiator-utils package.
Old 12-15-2008, 04:15 AM   #3
Registered: Dec 2008
Location: Athens
Distribution: Centos Ubundu RedHat
Posts: 38

Original Poster
Rep: Reputation: 15
My PowerEdge Expandable Raid Controller (PERC) is a PERC5 .
As I am reading the documentation I see that I need to download DKMS. Is this in order to be able to support the HW raid?
As well I have installed a centos5 will the same procedure apply to my Centos?



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