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On 07/31/2016 08:37 AM, Jörg Schaible wrote: |
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> Hi, |
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> |
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> for my backups I use a 3TB USB drive (one big ext4 partition) without any |
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> problems. Just plug in the cable, mount it and perform the backup. The |
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> partition (sdi1) is detected an mountable without any problems: |
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this tells you the device is valid and working. good. |
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> |
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> However, when I boot a rescue system from a USB stick, the partition on the |
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> USB is not detected. I already tried latest SystemRescueCD (default and |
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> alternate kernel), Knoppix and the Gentoo Admin CD. Nothing, the partition |
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> is not available. |
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So there could be a multitude of reasons. Did thos systems have a bios |
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that support booting from a usb device? Are the bios setting set to |
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select the bios device correct? |
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I recently read somewhere the usb devices only support (2) types of |
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image booting, but I cannot find that doc right now. rodsbooks is |
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an excellent resource for all the issues around booting and device |
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and various hardware/firmware issues. LikeWhoa has made booting the usb |
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for gentoo, commonplace so search out those postings on the gentoo |
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forums and in the wiki. |
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> What's the difference? Why does my kernel find this partition and the other |
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> one's do not? It's pretty silly to have a backup drive and cannot access it |
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> in question ;-) |
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It could be many things. You just have to ferret thru ideas until |
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something works for your hardware, and it is a frustrating process. |
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make sure the image you are trying to boot is on a compatible partition |
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and file system that is supported by the boot image. |
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hth, |
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James |
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