dmraid raid5 fakeraid dualboot(Solved)

Hu · Administrator Joined: 06 Mar 2007 Posts: 21706

If those are the only errors, then yes, it is probably otherwise working. I copied the RAID command from your initscript, so I did not know whether it would work. Apparently, that invocation is incorrect.

Gankfest · Posted: Sat May 07, 2011 3:07 am Post subject:

Is it possible that when the raid is created in Ubuntu 10 that the raid is nvidia_cadabaee and when gentoo makes the raid, it's something completely different. If so how would I know what the raid name is to mount it?
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cach0rr0 · Posted: Sat May 07, 2011 3:27 am Post subject:

Gankfest · Posted: Sat May 07, 2011 3:33 am Post subject:

Ya I got the rescue shell to work and with dmraid -r it shows the same name. After trying to do dmraid -ay it fails because the "raid45" module isn't in the kernel, because the raid module is now "raid456" for raid4/5/6. So... is there a way to fix this?

The modules is here in menuconfig:

DONAHUE · Posted: Sat May 07, 2011 4:02 am Post subject:

MD_RAID456 [=y] is for linux software raid
?

Gankfest · Posted: Sat May 07, 2011 4:11 am Post subject:

cach0rr0 · Posted: Sat May 07, 2011 4:19 am Post subject:

Gankfest · Posted: Sat May 07, 2011 4:26 am Post subject:

cach0rr0 · Posted: Sat May 07, 2011 4:36 am Post subject:

trying to think of a way to explain this that makes sense
failing, but ill give it a go:

whenever you're trying to run whichever command that tells you 'raid45' isn't in the kernel...if the driver that makes the device nodes it needs is already loaded, said device nodes will already be created, it doesn't care if the module is named 'raid45', or named 'fred'. All it cares about is whether the device node is created.

In this case, it sees that the device node isn't there, and as a last gasp it hopes the device node isn't there because the driver needed is a module instead of a built-in, as such it tries to load the driver that would make the device.

All that being said:

DONAHUE · Posted: Sat May 07, 2011 4:56 am Post subject:

@cach
what kernel version?
38-r4 here has

cach0rr0 · Posted: Sat May 07, 2011 5:02 am Post subject:

2.6.36-zen1 is where i found that

just checked a 2.6.37.5-zen system, it also has that

havent moved to .38 because im not entirely convinced the new "magic" autogrouping patch wont step on the toes of BFS should I try to use it, or that something else somewhere has changed that'd cause regressions for BFS.

hang tight, ill snag a .38 set of sources at least, and see if i can find 'er

fact of the matter is, if the dev nodes are there, it shouldnt be trying to load *any* driver.
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Gankfest · Posted: Sat May 07, 2011 5:07 am Post subject:

I have .38-r4 as well, so if I get one of those zen kernels build it copy the config over to the .38-r4, will it have the opt to set raid45 module or do I have to use the zen kernel. I don't really care what kernel I use, as long as it works.
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cach0rr0 · Posted: Sat May 07, 2011 5:13 am Post subject:

ok, it also exists on 2.6.38.4-zen

testing gentoo-sources now (rather, I'm emerging it)

aha! That's the difference. Looking at gentoo-sources 2.6.38-r4, it's raid456.

it's just raid45 on zen-sources.
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cach0rr0 · Posted: Sat May 07, 2011 5:15 am Post subject:

Gankfest · Posted: Sat May 07, 2011 5:16 am Post subject:

cach0rr0 · Posted: Sat May 07, 2011 5:17 am Post subject:

Gankfest · Posted: Sat May 07, 2011 6:22 am Post subject:

Alright building the kernel now and will post back if it's working or not. I didn't build 'raid45' as a module, because I don't have a /etc/modules.autoload.d/kernel-2.6. Don't know if I have to make one or not, I've just always built everything directly into the kernel.
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cach0rr0 · Posted: Sat May 07, 2011 6:51 am Post subject:

anything that's required to mount your root file system should *always* be built-in anyway

you can of course technically disregard that rule if you want to copy over a ton of modules and any modules they depend on into your initramfs, but this is clunky and prone to error IMHO
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Gankfest · Posted: Sat May 07, 2011 6:59 am Post subject:

It works and boots just fine, only thing I had to do was change /mnt/disk to /mnt/root and booted fine. Wanna say really appreciate the help and the time spent on making this possible. If you guys ever need anything you know where to find me! ;P
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