On 23/09/14 01:37, NeilBrown wrote: > On Mon, 22 Sep 2014 19:29:46 +0100 Wols Lists > <antlists@xxxxxxxxxxxxxxx> wrote: > >> I'm not sure if this is weird raid, stupid grub2 or incompetent >> newbie, but whatever ... and the system is my development/test >> system so if it gets trashed it's no disaster, but I would like >> to understand what is going on ... >> >> Old setup / = sdb2 /var = sdc2 /home = mdX (sdb3, sdc3), mirror >> >> I added sdd and made a new / = mdY (sdd3, missing) mirror and >> added sdd4 to mdX /home = mdX (sdb3 sdc3 sdd4) >> >> Weirdo one - sdd4 mirrored and synced fine. Then I rebooted ... >> mdX = (sdb3 sdc3 missing) mdZ = (sdd4 missing missing) > > You probably have something silly in your initrd which is making > invalid assumptions. What does /etc/mdadm.conf in your > initrd/initramfs contain? There shouldn't be anything there. I bombed into a grub2 shell, and mdadm.conf appeared to be the empty default. I also used ark to peer into the initramfs file and there didn't appear to be an mdadm.conf. But I've just had a bit of an uh-oh moment. Bear in mind I have two /boot's (mdY/boot and sdb2/boot), and two grubs or more (sda, sdb, sdd), I could be barking up a wrong tree. So that's my next step, try and *make* *sure* which grub I'm working with! Too many variables... > >> >> wtf?!?!? - oh and both of them share the same uuid. The obvious >> (but it shouldn't make any difference?) possibility is that sdb >> and sdc are 500Gb, partitioned identically. sdd is 1Tb, so sdd4 >> is twice the size of the other two. >> >> The other weirdo is I'm trying to migrate from grub/mbr to >> grub2/gpt. Of course that's causing me fun, but I've managed to >> get the system booting fine from mdY. Only snag is, when I list >> /dev, mdY isn't there! mount shows it as mounted on / but that's >> the only place I can find it! > > udev should create it. 'udevadm trigger' should cause udev to > create device files for all devices. That should be done as part > of the boot sequence. If you run "udevadm trigger" does /dev/mdX > get created? > No errors, no messages, no disk ... > >> >> mdadm v3.2.6 kernel 3.14.14-gentoo >> >> Any ideas what's going on? I've googled, but everything I find >> looks out of date or not relevant. > > "out of date or not relevant"?? You must have been looking on the > Internet ?!?! :-) :-) The search results were mostly ubuntu (I run gentoo, but so what), grub1, I'm migrating to grub2, and any mention of root/boot got plenty of results about not finding root and failing to boot, but absolutely nothing about successfully booting off a root that wasn't there! Plus they all seemed to be 2010 or earlier ... > > NeilBrown > Cheers, Wol -- 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
