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Richard Freeman <rich@××××××××××××××.net> posted |
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463D15D0.1030105@××××××××××××××.net, excerpted below, on Sat, 05 May 2007 |
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19:40:00 -0400: |
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> Ok, I am trying to get my raid working. I have /dev/hda,b,c,d and |
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> /dev/sda,b,c. My boot partition is on /dev/sda1 and /dev/sdb1 |
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> (mirrored). |
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> So, how do I set that up? |
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> |
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> Grub gives me: |
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> |
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> grub> find /boot/grub/stage1 |
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> (hd0,0) |
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> (hd3,0) |
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> (hd4,0) |
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> |
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> You can ignore hd0,0 - that is my old non-raid boot partition - it will |
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> get blown away once I'm migrated to the raid. |
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> |
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> I'm not sure if the drive numbers that grub sees will change when I boot |
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> off of sda or sdb. I did try to set things up following the various |
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> howtos and it didn't work, but they all tend to assume your boot drive |
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> is hd0. |
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> |
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> Any pointers? And don't ask why I have so many drives and am only now |
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> starting to set up a RAID... :) Suffice it to say my current lvm |
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> config makes me nervous... |
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Sounds like you /should/ be nervous. =8^( |
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OK, I'm tired and I'm not sure I'm answering the question you are asking |
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as I'm not sure I'm correctly parsing it, but let's see if this helps. |
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Think of it this way, when each drive is configured in BIOS to boot, |
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it'll probably see itself as hd0, with the BIOS switching around the |
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others accordingly to make it that way. |
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Rather than try to figure out which drive was which and get grub |
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installed correctly in them all (I have four in my RAID) from my running |
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system, I installed grub to a floppy, and booted that, so all the hard |
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drives appeared in their "natural" BIOS order. Then one by one, I |
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installed to them from the floppy, then when I was done, I tested by |
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pointing the BIOS at each one to boot from, and then doing the same |
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thing, but with the other drives removed, to be sure it could find grub |
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and grub could find /boot on the single remaining drive of the mirror set |
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with or without all the others in the mirror set there. |
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As noted above, with the BIOS pointed at a drive to boot, it may see |
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itself as hd0, regardless of where it's normally located. You can test |
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this, by configuring root (hd0,0) for each install, then point the BIOS |
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at it and see if it find /boot. If it does, you know that's what the |
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BIOS is doing, reassigning each drive as the first one. If it doesn't, |
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you know that it's not, and you probably need to use root (hd3,0) when |
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installing grub. Once grub is installed, however, you may be able to |
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boot it and figure out where it needs to point, if it's not pointed at |
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the right place. |
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Hope that helps, and didn't leave you even more confused. I know I did |
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it, but I took it a step at a time, and as I said, installed grub to a |
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floppy and booted it to figure out what was going on, then installed to |
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the hard drive from the floppy. |
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-- |
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Duncan - List replies preferred. No HTML msgs. |
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"Every nonfree program has a lord, a master -- |
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and if you use the program, he is your master." Richard Stallman |
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-- |
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