On Wed, Mar 9, 2011 at 11:51 AM, <m.roth at 5-cent.us> wrote: > Peter Peltonen wrote: >> On Wed, Mar 9, 2011 at 6:33 PM, <m.roth at 5-cent.us> wrote: >>> Peter Peltonen wrote: >>>> >>>> Based on that info I assume the board having a "8x SAS Ports via LSI >>>> 1068E Controller". We received the server with 3 drives + 1 spare as >>>> hw RAID-5 preinstalled. During bootup I see that the drives are >>>> initialised and everything seems ok. >>>> >>>> The issue I am facing is that when trying to install CentOS no hard >>>> drives are recognised. >>> >>> I recently had a problem like that with a Dell box. The trick is that >>> with a hardware controller, it supercedes software RAID. What you need > to do >>> is go into the firmware controller configuration on boot, before you > get to >>> grub, and make sure everything's visible and correct. The controller can >>> see the drives, but not present them to the o/s if you don't. >> >> Hmm, I am not sure if I understand you correctly: are you saying that >> in the firmware configuration there might be an option that makes the >> disks invisible for the OS? This sounds a bit strange and I wonder >> what such config could be... >> >> Or are you suggesting that I should put the controller in "JBOD mode" >> and then use software RAiD instead of hardware RAID? I would not like >> to go with this option as I think the performance would suffer this >> way? > > Nope. They may have said they "pre-installed the RAID, but you really need > to go into the setup (<ctrl-c>, or -f, or whatever), and see what it > presents ->logically<- (key buzzword). If it hasn't been initialized, or > put into logical configuration, then it simply will not present the > logical drives to the o/s, and AFAIK, it will *not* present the physical > drives at all. I think that it's ctrl-r and that you have to set up "virtual disks" using the "physical disks".