2008/12/5 Greg Freemyer :

On Fri, Dec 5, 2008 at 8:42 AM, PaPa NoeL wrote:

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---------- Forwarded message ---------- From: PaPa NoeL Date: 2008/12/5 Subject: Re: [opensuse] Hardware Compatibility : Adaptec 1430SA / OpenSuSe V11.0 To: Per Jessen

2008/12/5 Per Jessen :

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PaPa NoeL wrote:

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yesterday, I have tried to make RAID 10 work with DMRaid. Didn't manage to do it.

Which problems did you experience?

/Per

-- /Per Jessen, Zürich

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I have set my adaptec car to single disk mode. Then I have lunch the OpenSuse 11.0 installer which crashed in the first place so I forced it to start. Then when setting up the arrays in the installer, I could only make raid 0,1 or 5. When I had set up two array of Raid 0, I couldn't make anymore RAID. I tried to play with the dmraid command, but I got nothing except the list of my single disk.

When I set up the Adaptec card to use RAID 10, the installer sees only one BIOS RAID disk and I can't do anything about it really. The thing that might be complicated, is to install straight away the OS on the array, so I can't fiddle around.

Do you appreciate that mdraid is different than dmraild?

dmraid is the "fake-raid" solution that gets the raid config from the fake-raid controller. That is what I recommended avoiding.

mdraid is the pure software raid that I was discussing when I provided pros and cons. You interface to it via mdadm.

Greg -- Greg Freemyer Litigation Triage Solutions Specialist http://www.linkedin.com/in/gregfreemyer First 99 Days Litigation White Paper - http://www.norcrossgroup.com/forms/whitepapers/99%20Days%20whitepaper.pdf

The Norcross Group The Intersection of Evidence & Technology http://www.norcrossgroup.com

OK, So I have made the mdRaid work finally and I have tested it: The performances look slightly better than using the RAID card during file transfers (+/- 10 Mo/s better) However, I have an issue: when I reboot, mdadmin doesn't re-spawn the array entirely: /dev/md0 --> is the Raid 1 of sdb sdc /dev/md1 --> is the Raid 1 of sdd sde /dev/md3 --> is the RAID 0 of md1 & md0 and this one doesn't come up at reboot. I have to rebuild it with mdadm --create /dev/md3 --chunk=64 --level=0 --raid-devices=3 /dev/md0 dev/md1 and remount the file system. I have checked the FStab and it's all ok... so I don't know why it's doing that. But to test the software raid, I had to use a spare disk to first install the system on it.... I'm still thinking about buying another Raid card, because I want my NAS to be "safe" and not a pain to maintain. ElPaPaNoeL