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!*)
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