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Kvetch
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Joined: 29 Apr 2004
Posts: 318
Location: /dev/null, VA
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 Posted: Sun Mar 18, 2007 3:24 pm Post subject: RAID question - dmraid vs kernel raid1 |
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Hello, I recently purchased two 500GB drives that I would like to put into a raid1 mirror on my nvidia raid controller. I do not want this drive to be my / or /boot. It is just a separate drive that I would like mirrored. Since it is not going to be my main drive should I not use dmraid at all and just use the kernel raid? Which one would give me the best performance and stability? I do not dual boot into any other OS'es.
Thanks,
Nick |
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Veldrin
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Joined: 27 Jul 2004
Posts: 1945
Location: Zurich, Switzerland
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| Posted: Sun Mar 18, 2007 4:23 pm Post subject: |
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I recently set up a (sw)raid1 system with luks encryption, and I used the kernel's raid modules and adadm for userspace raid control. From what I understand dmraid is getting old (and not worth using anymore (??))
OTOH I am not sure whether nvidia raid controller ser supported for hardware raid.
Cheers
V. |
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Kvetch
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Joined: 29 Apr 2004
Posts: 318
Location: /dev/null, VA
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| Posted: Sun Mar 18, 2007 9:44 pm Post subject: |
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I saw a post from NeddySeagoon about dmraid https://forums.gentoo.org/viewtopic-t-512798-highlight-dmraid+boot.html and had another few questions. It sound like I should use kernel swraid and not dmraid.
When doing kernel software raid is there any benefit in setting the bios to use raid or should I just set them up as separate drives? Should I just build the machine on the single drive then add the two drives and setup the software raid?
Any clues to how much overhead swraid is going to eat up? I am not too concerned with it but I wonder if it is worth the trouble. I could just split the two drives and use one to back up the other via rsync or come cpio script. |
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devsk
Advocate
Joined: 24 Oct 2003
Posts: 3003
Location: Bay Area, CA
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| Posted: Mon Mar 19, 2007 4:30 am Post subject: Re: RAID question - dmraid vs kernel raid1 |
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| Kvetch wrote: | | Which one would give me the best performance and stability? |
both are equally stable but have a livecd with latest dmraid executable for BIOS raid: ones in the livecd may not work. You need mdadm for kernel raid and most livecd's have it by default. Performance (as measured by bonnie++) wise, dmraid is better, only slightly though.
| Kvetch wrote: |
I do not dual boot into any other OS'es.
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if you don't dual boot, there is hardly any real reason for using BIOS raid. kernel raid is less headache, probably better maintained and integrated. |
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Kvetch
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Joined: 29 Apr 2004
Posts: 318
Location: /dev/null, VA
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| Posted: Mon Mar 19, 2007 11:50 pm Post subject: |
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