Hi Michael, lsblk does not show the third partition, but gdisk knows it's there - see below. See also results when trying to mount the 3rd partition. [root@localhost ~]# ls -l /mnt total 6 drwxr-xr-x. 2 root root 4096 Feb 2 15:33 raid drwxrwxrwx. 1 root root 2304 Feb 2 15:46 sdd1 [root@localhost ~]# mount --read-only /dev/sdc3 /mnt/raid mount: you must specify the filesystem type [root@localhost ~]# mount --read-only -t ext4 /dev/sdc3 /mnt/raid mount: special device /dev/sdc3 does not exist [root@localhost ~]# lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda 8:0 0 596.2G 0 disk ├─sda1 8:1 0 500M 0 part /boot └─sda2 8:2 0 595.7G 0 part ├─VolGroup-lv_root (dm-0) 253:0 0 50G 0 lvm / ├─VolGroup-lv_swap (dm-1) 253:1 0 7.8G 0 lvm [SWAP] └─VolGroup-lv_home (dm-2) 253:2 0 537.9G 0 lvm /home sdb 8:16 0 2.7T 0 disk sdc 8:32 0 2.7T 0 disk ├─sdc1 8:33 0 200M 0 part └─sdc2 8:34 0 2G 0 part sr0 11:0 1 200M 0 rom sdd 8:48 0 3.7T 0 disk └─sdd1 8:49 0 3.7T 0 part /mnt/sdd1 [root@localhost ~]# gdisk /dev/sdc GPT fdisk (gdisk) version 0.8.8 Partition table scan: MBR: protective BSD: not present APM: not present GPT: present Found valid GPT with protective MBR; using GPT. Warning! Secondary partition table overlaps the last partition by 4294968498 blocks! You will need to delete this partition or resize it in another utility. Command (? for help): p Disk /dev/sdc: 5860531055 sectors, 2.7 TiB Logical sector size: 512 bytes Disk identifier (GUID): BC837200-8528-4F8C-A78B-C529DA2B56CB Partition table holds up to 128 entries First usable sector is 34, last usable sector is 1565563725 Partitions will be aligned on 2048-sector boundaries Total free space is 2014 sectors (1007.0 KiB) Number Start (sector) End (sector) Size Code Name 1 2048 411647 200.0 MiB EF00 2 411648 4605951 2.0 GiB 8200 3 4605952 5860532223 2.7 TiB FD00 Command (? for help): Maybe this is as simple as getting the Linux to see the 3rd partition? I have another email in the works, but I'm waiting for the 3TB to dd to another drive . . . Regards, George Toft On 2/3/2014 12:23 AM, Michael Butash wrote: > The only time I've used gpt with linux was with a efi-boot-only > laptop, but prior I can raid the boot sector drive still with software > and not have to use fakeraid at all for full partition redundancy. > Still kind of a new concept for a lot of people I think. Ubuntu > otherwise happily still uses mbr, so was a bit of a curve for me to > have to adapt as they don't bake their gpt or raid tools well in the > initrd or install. > > If you raided your /boot and *other* raid volume, I'd say just redo > the partitions with gdisk and resync the raid which is pretty easy (I > have to do this somewhat commonly with my ssd's). I can run swap and > root from lvm on the raid otherwise for full redundancy and easy disk > rebuilds if/when needed. That keeps failure recovery very easy. Only > EFI complicates this with crappy non-raidable fat32 partitions needed > now (eww, thanks microsoft). > > My gpt/efi laptop looks much the same with dual ssd's, but has the > first partition as an identical fat32 partition on each to satiate > ubuntu as /boot/EFI and /bootEFI1, plus a mdraided /boot second, and > crypt volume third. If not adding encryption, lvm atop the mdraid pv > for a lot more flexibility in volume/redundancy restoration among > disks. I just rsync the stupid efi fat32 disks. > > mb@host:~$ lsblk > NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT > sdh 8:112 0 111.8G 0 disk > ├─sdh1 8:113 0 100M 0 part > │ └─md127 9:127 0 100M 0 raid1 /boot > └─sdh2 8:114 0 111.7G 0 part > └─md126 9:126 0 111.7G 0 raid1 > └─spv0 (dm-0) 252:0 0 111.7G 0 crypt > ├─vg0-root (dm-1) 252:1 0 2G 0 lvm / > ├─vg0-swap (dm-2) 252:2 0 2G 0 lvm [SWAP] > ├─vg0-var (dm-3) 252:3 0 2.5G 0 lvm /var > ├─vg0-usr (dm-4) 252:4 0 10G 0 lvm /usr > ├─vg0-home (dm-5) 252:5 0 32G 0 lvm /home > sdi 8:128 0 111.8G 0 disk > ├─sdi1 8:129 0 100M 0 part > │ └─md127 9:127 0 100M 0 raid1 /boot > └─sdi2 8:130 0 111.7G 0 part > └─md126 9:126 0 111.7G 0 raid1 > └─spv0 (dm-0) 252:0 0 111.7G 0 crypt > ├─vg0-root (dm-1) 252:1 0 2G 0 lvm / > ├─vg0-swap (dm-2) 252:2 0 2G 0 lvm [SWAP] > ├─vg0-var (dm-3) 252:3 0 2.5G 0 lvm /var > ├─vg0-usr (dm-4) 252:4 0 10G 0 lvm /usr > ├─vg0-home (dm-5) 252:5 0 32G 0 lvm /home > > -mb > > > > On 02/02/2014 08:44 PM, George Toft wrote: >> installed gdisk and it looks like /dev/sdb is damaged, but /dev/sdc >> is good :) doing a dd on the whole drive to a file on another drive >> so I have a backup. I'll check back in a couple days when it's done. >> >> Regards, >> >> George Toft >> >> On 2/2/2014 2:58 PM, Matt Graham wrote: >>>>> # fdisk -l | egrep "GPT|dev" >>>>> WARNING: fdisk doesn't support GPT. >>>>> /dev/sdb1 1 267350 2147483647+ ee GPT >>> >>>>> # mdadm --assemble --run /dev/md0 /dev/sdb1 >>>>> mdadm: cannot open device /dev/sdb1: No such >>>>> file or directory >>> >>> This is an odd message to get, and probably means that udev didn't >>> find the device and create it because udev and/or the rescue >>> system's GPT support is flaking out. Does the kernel in this rescue >>> system support GPT? "mknod /dev/sdb1 b 8 17" to create it. You may >>> wish to "mknod /dev/sdc1 8 33" in case the other softRAID-1 disk has >>> better stuff on it. >>> >>> As other people have said, there should be no need to use mdadm to >>> assemble an array out of RAID-1 partitions. "mount /dev/sdb1 >>> /mnt/somewhere" should do something useful if the device node and >>> /mnt/somewhere exist. >>> >>> On 2014-02-02 12:57, Michael Butash wrote: >>>> Use gdisk if/when doing gpt >>> >>> That too. (One day, we will forsake our filesystems and break all >>> bonds of block devices to get a disk larger than 2T for actual >>> experience with GPT, but today is *not* this day. This day, we >>> *SOLVE TECH PROBLEMS!!!1!*) >>> >> >> --------------------------------------------------- >> PLUG-discuss mailing list - PLUG-discuss@lists.phxlinux.org >> To subscribe, unsubscribe, or to change your mail settings: >> http://lists.phxlinux.org/mailman/listinfo/plug-discuss > > --------------------------------------------------- > PLUG-discuss mailing list - PLUG-discuss@lists.phxlinux.org > To subscribe, unsubscribe, or to change your mail settings: > http://lists.phxlinux.org/mailman/listinfo/plug-discuss --------------------------------------------------- PLUG-discuss mailing list - PLUG-discuss@lists.phxlinux.org To subscribe, unsubscribe, or to change your mail settings: http://lists.phxlinux.org/mailman/listinfo/plug-discuss