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On Tue, Jun 25, 2013 at 5:51 PM, Mark Knecht <markknecht@×××××.com> wrote: |
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> This is related to my thread from a few days ago about the |
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> disappointing speed of my RAID6 root partition. The goal here is to |
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> get the machine booting from an SSD so that I can free up my five hard |
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> drives to play with. |
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> |
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> SHORT SUMMATION: I've tried noninitrd and noraid in the kernel line of |
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> grub.conf but I keep booting from old RAID instead of the new SSD. |
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> What am I doing wrong? |
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Here are some things I would try to narrow it down: |
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Put raid=noautodetect on your kernel commandline to prevent the kernel |
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from auto-assembling the array |
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It sounds like you are pretty sure it is at least using the boot |
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sector of the new drive, so I am thinking it is possible there is some |
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weird combination of using a boot sector from one drive to get you |
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into the boot partition of another drive. If the old boot drive is |
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still attached, you could try moving/renaming the grub config or whole |
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grub folder on the old boot drive to make sure it's not getting used. |
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If that doesn't give any clues, I would physically unplug the cable of |
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every drive other than the SSD (if that is realistic based on your |
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filesystem layout) and see how far it gets. Maybe if it fails you can |
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figure out what it's trying to access on the other disks. |
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As far as the RAID I think there are at least a few different ways an |
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mdraid array comes to be assembled: |
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- your initramfs does it |
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- your kernel does it (only for a RAID with v0.90 superblock) |
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- init script does it (/etc/init.d/mdraid) |
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- udev does it (/lib64/udev/rules.d/64-md-raid.rules) |
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- you manually do it later on using mdadm |
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Viewing dmesg output from around the point where boot begins and the |
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RAID is assembled might give you some clues about who's doing what. |
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I recently upgraded my machine and disks and am using UUID and labels |
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for everything, I can literally boot from either the old HDD or new |
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HDD from my BIOS boot menu, plugging them into the motherboard in any |
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order, and either one will work properly, even though the /dev/sdX |
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assignments might change from boot to boot. You can use the blkid |
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command (as root) to see the labels and UUIDs for all of your drives |
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and partitions. |
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Good luck, |
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Paul |
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