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New AMD64 system. Help a noobie with RAID issues.
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HecHacker1
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PostPosted: Sun Sep 26, 2004 6:39 pm    Post subject: New AMD64 system. Help a noobie with RAID issues. Reply with quote

Ok, I have been doing searching in these forums (and in Nforcershq.com) for anything related to RAID and getting it to work correctly with the Nvidia RAID (or for that matter, even the Si3114). What I have learned so far is that because it is only software RAID it presents a bunch of problems for the linux community. But I don't know if there has been any development on it since then.

My problem is that I have windows installed on 2x160 RAID 0. I left 100GB of it unpartitioned so that I could "hopefully" install Gentoo on it. So the next thing I did was download a new Resier4 live cd with a 2.6.9 kernel so that my devices could have support. I booted up and then did

Code:
fdisk -l


So that i could see what drives I was gettings. It did find my two hard drives, but not in a RAID configuration. I also couldn't find the extra 100GB of free space i left aside.

Is there anything I can do in order to install Gentoo and Windows on the same array? I read about creating identicle partitions and then using modprobe md or something like that, but I don't think that applies to what I want to do. I want to keep windows xp.

Thank's for bearing with me.

System Specs:
Asus K8N-E
Athlon 3200+
2x160GB Western Digital SATA on Nvidia RAID (off mobo support)
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yassen
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PostPosted: Sun Sep 26, 2004 8:20 pm    Post subject: Reply with quote

Well, some advice follows, based on my limited experience with RAID-1 on Intel ICH5(R) SATA (Raid) controller.

(1) As you said these are essentially software raids, and because doing the RAID the "usual linux way" (look for the Linux SW RAID howto) is much better supported, I chose this "usual way". Performance loss? Don't know, but should be insignificant if any.

(2) I advice that you first do your Linux RAID install and then your Windows one. Leave at least one primary partition for each OS (if you are going to have more than one, especially for the Linux install). You will probably need to reinstall and reconfigure your bootloader after doing so, as Windows has the nice habit ot overwrite everyhting in the MBR without any notice.

(3) Some linux RAID related links:
The official Linux SW RAID HOWTO:
http://www.ibiblio.org/pub/Linux/docs/HOWTO/other-formats/html_single/Software-RAID-HOWTO.html

Gentoo SW RAID:
http://www.gentoo.org/doc/en/gentoo-x86-tipsntricks.xml#software-raid
installing on a RAID: http://forums.gentoo.org/viewtopic.php?t=8813

Useful:
http://forums.gentoo.org/viewtopic.php?t=225559
http://forums.gentoo.org/viewtopic.php?t=212546
http://forums.gentoo.org/viewtopic.php?t=226339
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yassen
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PostPosted: Sun Sep 26, 2004 8:23 pm    Post subject: Reply with quote

(and do not expect that fdisk shows anything about RAID -- it know nothing about it, it knows only about your physical devices and how they are partitioned.)
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HecHacker1
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PostPosted: Tue Sep 28, 2004 1:45 am    Post subject: Reply with quote

so what I got from all that is that it is currently not possible to install windows and linux on the same RAID 0 partition. (and installing windows first).

I guess i'll just have to dig up an older hard drive and use it for linux only (sadly i won't get the benfits of RAID).
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makmortiv
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PostPosted: Wed Sep 29, 2004 7:59 am    Post subject: Reply with quote

Mmm...I think you may be missing a little bit of his point. If you're only using RAID0 or RAID0+1...you might as well be using a sw raid. I know since Window 2K softraid has been enabled and is really easy to setup...and for the most part it's equivelent in Linux too.

Now I'm assuming that you'd want 3 partitions? 1 for ntfs (boot windows and program files etc), 1 for linux, 1 for shared files like downloads and whatever? That about hit it on the head? :)
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HecHacker1
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PostPosted: Wed Sep 29, 2004 10:42 pm    Post subject: Reply with quote

well, for swraid i would need three hard disks anyways, so it kind of defeats the purpose of using my built in raid/SATA.

Yes, the mobo RAID's are usually just a little chip that provides connection for software RAID, but NVIDIA finally got it right with my mobo and I'm pretty sure it's a form of Hardware RAID.

If I used Software RAID in windows XP (or linux) then I basically am using a lot of CPU time for doing RAID, it defeats the purpose of my integrated RAID (which has really good performance in Windows XP). The NVRAID drivers for windows only use 0-1% of CPU and provide litterally double the throuhput.

Oh well, i am just going to get a separate IDE hard disk and use it for linux.
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R!tman
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PostPosted: Tue Jan 18, 2005 10:29 pm    Post subject: Reply with quote

yassen wrote:
(3) Some linux RAID related links:
The official Linux SW RAID HOWTO:
http://www.ibiblio.org/pub/Linux/docs/HOWTO/other-formats/html_single/Software-RAID-HOWTO.html

Gentoo SW RAID:
http://www.gentoo.org/doc/en/gentoo-x86-tipsntricks.xml#software-raid
installing on a RAID: http://forums.gentoo.org/viewtopic.php?t=8813

Useful:
http://forums.gentoo.org/viewtopic.php?t=225559
http://forums.gentoo.org/viewtopic.php?t=212546
http://forums.gentoo.org/viewtopic.php?t=226339


Thank you yassen, these links are very useful.
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