Mark Knecht <markkne...@gmail.com> wrote: >Hi, > I don't think this is likely to be a Gentoo issue but I figured I'd >ask here first before going elsewhere. (LKML, linux-raid, elsewhere) >Additionally it's not a critical problem at all but rather something >I'd like to try and understand and then report if appropriate. > > On my main i7-980x machine I've been wanting to move root away from >an old 3-disk 50GB RAID1 that I built first built the machine with to >a newer 150GB RAID6. Toward this end the machine has two complete >Gentoo builds on it: > >c2stable ~ # cat /proc/mdstat ><SNIP> > >md3 : active raid6 sdc3[1] sdd3[2] sdb3[0] sde3[3] sdf3[5] >157305168 blocks super 1.2 level 6, 16k chunk, algorithm 2 [5/5] >[UUUUU] > >md126 : active raid1 sdd5[2] sdc5[1] sdb5[0] > 52436032 blocks [3/3] [UUU] > >unused devices: <none> >c2stable ~ # > >md126 is the older RAID1, md3 is the newer RAID6. The are both built >on parts of the 5 hard drives in the box. > >The two builds are intended to be identical. Same packages installed, >same kernel with the only exception being the RAID6 uses an initramfs >built into it. A diff of the two kernel configs shows only that >difference: > >c2stable ~ # diff /usr/src/linux/.config >/mnt/newRAID6/usr/src/linux/.config >137c137,139 >< CONFIG_INITRAMFS_SOURCE="" >--- >> CONFIG_INITRAMFS_SOURCE="/usr/src/initramfs.config" >> CONFIG_INITRAMFS_ROOT_UID=0 >> CONFIG_INITRAMFS_ROOT_GID=0 >142a145,146 >> CONFIG_INITRAMFS_COMPRESSION_NONE=y >> # CONFIG_INITRAMFS_COMPRESSION_GZIP is not set >c2stable ~ # > > In my grub.conf file I have three methods of booting the machine. >There are two methods of booting the RAID1 config, using the device >name and using the label. For the RAID6 I have only the label method: > >(NOTE: Snipped out backup kernels just to clarify) > >c2stable ~ # cat /boot/grub/grub.conf >default 0 >timeout 15 >splashimage=(hd0,0)/boot/grub/splash.xpm.gz > >title RAID1 3.6.11-gentoo >root (hd0,0) >kernel (hd0,0)/boot/bzImage-3.6.11-gentoo root=/dev/md126 > >title RAID1 3.6.11-gentoo using LABEL >root (hd0,0) >kernel (hd0,0)/boot/bzImage-3.6.11-gentoo root=LABEL=RAID1root > >title RAID6 3.6.11-gentoo using LABEL >root (hd0,0) >kernel (hd0,0)/boot/bzImage-RAID6-3.6.11-gentoo root=LABEL=RAID6root > >c2stable ~ # > >c2stable ~ # e2label /dev/md126 >RAID1root >c2stable ~ # e2label /dev/md3 >RAID6root >c2stable ~ # > > >The results are: > >1) RAID1 using md126 boots fine >2) RAID1 using label of RAID1root fails >3) RAID6 using label of RAID6root boots fine > > The failure is a kernel crash before the machine gets very far so >the only capture I might be able to try is with a camera and then post >that on line, but the screen is 80x25 and it's just a kernel crash so >there's very little data on the screen when the machine dies. > > I've been Googling around for a couple of days but haven't found >anything very interesting. I figured I'd ask here first just to see >what ideas come up. > >Thanks, >Mark
Mark. I seem to remember that to be able to use LABEL for the root= line requires an init* as you need userspace utilities to read the labels. You could try the UUIDs instead. But I am not sure if that might work. HTH Joost PS. All the best for 2013! -- Sent from my Android phone with K-9 Mail. Please excuse my brevity.
