On Thu, 4 Mar 2010 17:00:10 -0500 (EST) "Ken D'Ambrosio" <ken@xxxxxxxx> wrote: > On Thu, March 4, 2010 3:50 pm, Neil Brown wrote: > > On Thu, 4 Mar 2010 11:12:29 -0500 (EST) > > "Ken D'Ambrosio" <ken@xxxxxxxx> wrote: > > [bad things happened to Ken's RAID-5 here] > > > > > You missed the bit where you provide concrete information rather than > > vaguaries. > > Humble apologies; I'm not well-enough versed with the intricacies of Linux > RAID to know what's appropriate and not. > > > I'm guessing that you created the array over whole-devices, and then > > partitioned the array - is that correct? If fdisk shows you an > > unpartitioned array, maybe just the partition table is corrupt. Seems > > strange. > > Actually, no. These were created using /dev/sd[abcd]2 -- I saved off > space on sd[abcd]1 for swap, /tmp, etc. Done via the Ubuntu installer, if > that makes a difference. For the record, all the /dev/sd[abcd]1 non-RAID > partitions look fine. > > > To so that I/we don't have to guess, please give exact commands that you > > run and the exact output so we have access to the same information as you. > > Well, I rebooted, and was surprised that nothing RAID-esque came up. > Since my OS is on one of the afore-mentioned non-RAIDed partitions, the > OS, itself, booted, but none of the RAID partitions mounted. I tried to > mount, and failed. That's when I checked the RAID device, /dev/md0. > fdisk showed it lacking any partitions, but the mdadm.conf file hadn't > been touched for a couple of weeks, so I was pretty sure nothing there had > changed. On the off chance that the SCSI drives had re-ordered > themselves, I went through all 24 permutations of > mdadm --assemble /dev/md0 /dev/sda2 /dev/sdb2 /dev/sdc2 /dev/sdd2 > since I wasn't sure if the drive order was significant. All of them > "worked," inasmuch as they created /dev/md0, but in all cases it was > partitionless. I also tried mdadm --detail --scan, to verify that it > matched UUIDs with those in the /etc/mdadm.conf file, and it did (the > array line looks thusly: > ARRAY /dev/md0 level=raid5 num-devices=4 > UUID=1e89645a:7e24dcef:9e77d54f:077a6a6f ) > > > > Too much data is much much better than not enough. > > Granted... but, sometimes -- especially when learning -- there can be a > bad signal:noise ratio. Tends to make me hesitant when I'm a (relative) > newbie to a given topic. That being said, I *think* I've figured out what > I should be doing, but I also think I did it. Did I miss something? Which part of "please give exact commands that you run and the exact output" Did you have trouble with? Try this: cat /etc/fstab cat /etc/mdadm.conf mdadm -Esvv mdadm -Asv blkid -p /dev/md* And include all the output. (sorry if I seem grumpy, but I'm a bit tired which makes it harder to appear polite). NeilBrown -- 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
