Hi, On Fri, 20 Jan 2006, Reuben Farrelly wrote: > On 20/01/2006 11:32 a.m., Neil Brown wrote: > > > > The in-kernel autodetection in md is purely legacy support as far as I > > am concerned. md does volume detection in user space via 'mdadm'. > > Hrm. <puzzled look> How would I then start my md0 raid-1 array that is > mounted as the root partition / if I'm not doing this when the kernel is > starting up? Because without it I've got no userspace to actually execute. Indeed you won't be able to use a 'plain kernel' anymore but switch to kernel + initrd. This adds a good amount of useful flexibility (but makes life a little bit harder). The autodetect feature got discussed multiple time with pro/cons for it (so I will skip it there) with the overall outcome that it's a to dangerous feature to leave in kernel space (btw. on some architectures it doesn't work at all anyway) in the long term. > Some of the other arrays with things like /var and /home could obviously be > easily assembled soon after the kernel hands over control to userspace before > the filesystem points are mounted, but for the root I am not quite sure > how it > could work... A simple initrd. If you look at random distributions (e.g. Debian) you will see it done that way (yes I don't think it's perfect as it is yet). Personally on systems which change often I run without auto detect. On systems which hardly change and if get wiped disks I use the autodetection. Andre' - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
