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On 08/01/2016 01:45 AM, J. Roeleveld wrote: |
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> On Sunday, July 31, 2016 03:37:55 PM 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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>> |
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>> =============== %< ============== |
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>> $ ls -l /dev/disk/by-id |
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>> total 0 |
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> |
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> <snipped bunch of 'ls' statements |
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> |
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>> =============== %< ============== |
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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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>> |
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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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> |
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> Which kernel do you boot? |
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> The systerescue-cd has 4 kernels: |
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> 2 * 64bit and 2 * 32bit. |
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> |
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> By default, it boots the "default" one for the architecture you are booting. |
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> Have you tried booting the "alternate" kernel? |
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> |
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> I have 1 system that I need to boot using the "alternate" kernel as the |
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> "default" one is too old. (Yes, by default it boots an old kernel) |
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> |
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> It could easily be that the kernel you are using does not support your USB3 |
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> adapter or something else you used. |
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> |
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> Eg. apart from all the 'ls' statements, also check "uname" and |
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> "/proc/config.gz" for differences. |
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I was just reading about "IOMMU" and how often, if it is not "correctly |
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configured" in the kernel and other places, your memory map to other |
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hardwawre, like USB, can be flaky or not work at all. Fixes often |
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require loading the latest bios for your motherboard. It also matters |
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the 'rev' of your motherboard and other details. |
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|
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I have a Gigabyte GA-990FXA-ud3 that seems to be a victim of this bug. |
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No, I have not had time to ferret out this issue, so here are a few raw |
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links where it is talked about:: |
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https://www.reddit.com/r/linux/comments/4ixnyg/question_about_iommu/ |
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|
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https://en.wikipedia.org/wiki/Input–output_memory_management_unit |
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http://developer.amd.com/community/blog/2008/09/01/iommu/ |
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http://pages.cs.wisc.edu/~basu/isca_iommu_tutorial/ |
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https://en.wikipedia.org/wiki/List_of_IOMMU-supporting_hardware |
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(more posted if you ask)... |
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hth, |
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James |
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