LinuxQuestions.org

LinuxQuestions.org (http://www.linuxquestions.org/questions/index.php)
-   Linux - Hardware (http://www.linuxquestions.org/questions/forumdisplay.php?f=18)
-   -   SiL3114 RAID10 + Fedora 17 only sees four separate drives (http://www.linuxquestions.org/questions/showthread.php?t=4175432475)

Klaus_K 10-16-2012 07:35 AM

SiL3114 RAID10 + Fedora 17 only sees four separate drives
 
Hi, I am trying to configure a system using a Silicon Image 3114 chipset RAID controller to connect 4x1TB drives in a RAID-10 configuration. Unfortunately, when I try and install Fedora17, it sees the RAID array as four separate drives, rather than as one larger drive. Any suggestions gratefully received!

jefro 10-16-2012 03:04 PM

I can only guess that the raid you believe you have is not a true raid. Different linux distro's see them once in a while but I'd never use one of the faux raid (fakeraid) controllers in linux.

CubanVJ 10-16-2012 05:59 PM

RAID
 
Have you setup the RAID first. Typically, you setup the RAID up in the BIOS first. That way the OS sees it as a whole volume. If you attempt to setup the array after the install, it will fail because you need to initialize the drives for the spanning and mirroring to occur.

Klaus_K 10-17-2012 10:31 AM

Quote:

Originally Posted by CubanVJ (Post 4807628)
Have you setup the RAID first. Typically, you setup the RAID up in the BIOS first. That way the OS sees it as a whole volume. If you attempt to setup the array after the install, it will fail because you need to initialize the drives for the spanning and mirroring to occur.

Yes, I set up the array no problem. I think that the issue is that the standard open source driver shipped with Fedora is not compatible with this chipset. See here for further details.

The next issue is how do I get the system to boot with the 'noprobe' mode? But that's a question for another day, I guess :-(

I've tried various techniques, following various bits of documentation I've found on the internet, but none of them seem to work. I suspect (fear?) that this may be due to the fact that I'm installing from a Fedora Live CD, but this is no more than a suspicion.

cascade9 10-18-2012 03:26 AM

SiL3114 is another fakeRAID chip. I'd use mdadm.

Klaus_K 10-18-2012 03:52 AM

Quote:

Originally Posted by cascade9 (Post 4808878)
SiL3114 is another fakeRAID chip. I'd use mdadm.

Bugger, bugger, bugger :(

It seems weird that the chipset requires me to configure the RAID in the BIOS at boot-up, which is not what I'd expect from a softraid.

Oh well, older and wiser - see if I can find a h/w RAID - used Promise in the past, which worked fine.

jefro 10-18-2012 05:01 PM

Those chips have a bios and can configure the drives before the OS is loaded. That part is more like a real hardware based raid. It's use within the OS is the fake part. Some chip sets may work with some version or kernel on some distro's. They all tend to be iffy from distro to distro or even updates.

If you want true raid then you need a real hardware based raid controller.

If you want software raid then the mdadmin deal is a way to go.

Fake raid is somewhere between real and software. It got the term fake for a good reason.

Klaus_K 10-19-2012 03:39 AM

I've now ordered a 3Ware 9500S which I've used in the past and which I *think* provides h/w RAID - will let you know how I get on.

jefro 10-19-2012 03:29 PM

If you believe the sales pitch from one place.

"3ware 9500S Features

Optimized hardware XOR RAID 5 "

And a sweet addition.

"Battery Backup Unit (BBU)"

CubanVJ 10-19-2012 05:13 PM

Quote:

Originally Posted by Klaus_K (Post 4809741)
I've now ordered a 3Ware 9500S which I've used in the past and which I *think* provides h/w RAID - will let you know how I get on.

You should have better luck with that. We use 3ware/LSI cards here at work on RHEL and Ubuntu servers with no issues. Good luck.

Klaus_K 10-21-2012 05:49 AM

3Ware 9500S working fine (so far)
 
Quote:

Originally Posted by CubanVJ (Post 4810286)
You should have better luck with that. We use 3ware/LSI cards here at work on RHEL and Ubuntu servers with no issues. Good luck.

Yup - it's working just fine thanks, configured 4x 1TB into a 2TB RAID10, which appears to the installer as a single 2TB drive. Up and running no problem. I can't justify a BBU which, surprisingly, is considerably more expensive than the actual RAID controller. Fortunately, I'm using it in my media server, so write caching is not really necessary, hence can disable this and cope without BBU.


All times are GMT -5. The time now is 11:47 PM.