On Sat, Aug 29, 2015 at 10:06 AM, D. Hugh Redelmeier <hugh@mimosa.com> wrote:

| From: o1bigtenor <o1bigtenor@gmail.com>

| (Its a uefi setup)

Is it a GPT setup? UEFI may even require GPT. They certainly seem to
go together.

| fdisk -l shows the array
| its not mounted

fdisk doesn't tell you about mounts. But perhaps you don't mean
"mounted". Or perhaps I don't understand what you are saying.

fdisk doesn't understand GPT disks.

# cat /proc/mdstat
Personalities : [raid10]
md0 : active (auto-read-only) raid10 sde1[0] sdf1[1] sdc1[4] sdb1[3]
1953518592 blocks super 1.2 512K chunks 2 near-copies [4/4] [UUUU]

# mdadm --examine --scan
ARRAY /dev/md/0 metadata=1.2 UUID=79baaa2f:0aa2b9fa:18e2ea6b:6e2846b3 name=debianbase:0

from blkid

/dev/md0: PTUUID="1eb47793-0cdf-4e16-ae84-33ec825ac448" PTTYPE="gpt"

from fdisk -l

Disk /dev/md0: 1.8 TiB, 2000403038208 bytes, 3907037184 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 524288 bytes / 1048576 bytes
Disklabel type: gpt
Disk identifier: 1EB47793-0CDF-4E16-AE84-33EC825AC448

fdisk seems to understand disks a little bit.