I'm trying to create (two) software RAID1 arrays on two identical 4TB non-boot drives. I'm following advice from several forum posts but keep running into trouble. Here's what I've done so far:
for each brand-new drive (/dev/sdb and /dev/sdc):
sudo fdisk <drive>
"o" to create a new partition table (I think this is necessary?)
"n" to create new partition
"p" and "1" to create primary partition #1
"2048" (default) partition start
"+3500M" partition end at 3.5GB.
Repeat with "p", "2", , "+500M" to create a smaller 500MB partition
This creates /dev/sdb1, /dev/sdb2, /dev/sdc1, /dev/sdc2
Create raid arrays:
sudo mdadm --create --verbose /dev/md0 --level=1 --raid-devices=2 /dev/sdb1 /dev/sdc1
- Repeat with /dev/md0, /dev/sdb2, /dev/sdc2
Create file system:
sudo mkfs -t ext4 /dev/md0
Creating the file system results in no errors, but if I run
sudo fdisk -l /dev/md0 I get:
Disk /dev/md0: 3667 MB, 3667853312 bytes 2 heads, 4 sectors/track, 895472 cylinders, total 7163776 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 4096 bytes I/O size (minimum/optimal): 4096 bytes / 4096 bytes Disk identifier: 0x00000000 Disk /dev/md0 doesn't contain a valid partition table
I can't seem to fix the "doesn't contain a valid partition table" thing. Is this a problem or is it supposed to be this way?
Bonus question: assuming I get these two arrays working, what is the "standard" place to mount them? Root?