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