[ILUG] Linux RAID introduction

[Wesley Darlington]

Hi,

On Tue, Apr 11, 2000 at 10:37:19AM +0100, John P. Looney wrote:
>  Speaking of, anyone added disks to a Dell box, that has a hardware raid
> card ? One of our servers here had a pair of 9GB disks, working away Raid
> 1+0'd. 
> 
>  Then I added two more, initialised them in the BIOS (took poxy ages), and
> then when I booted the machine up, it didn't see a "/dev/sdb" like I'd
> expected. Any ideas what else I've to do ? The relevant dmesg output is:
> 
> scsi2 : Found a MegaRAID controller at 0xe490, IRQ: 18
> megaraid: [Uc77:1.47] detected 2 logical drives
> scsi2 : AMI MegaRAID Uc77 254 commands 16 targs 2 chans 8 luns
> scsi : 3 hosts.
> scsi2: scanning channel 1 for devices.
> scsi2: scanning channel 2 for devices.
> scsi2: scanning virtual channel for logical drives.
>   Vendor: MegaRAID  Model: LD0 RAID1  8568R  Rev: Uc77
>   Type:   Direct-Access                      ANSI SCSI revision: 02
> Detected scsi disk sda at scsi2, channel 2, id 0, lun 0
> 
>  So, it sees 2 logical drives, but only detects one ?

I think you have to turn on "probe all LUNs" with the megaraid. It
presents all its hard drives as id0, lun $n$.

Just a thought,
Wesley.