cannot mount a virtual drive in centos 7

Question

I have a centos 7 which is installed in a RAID1 disks. I have another Raid6 disks which I would like to mount in the system.

when I do fdisk -l

the Raid 6 shows as:

Disk /dev/sdb: 40000.0 GB, 39999997214720 bytes, 78124994560 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

but when I try

mount /dev/sdb /home/shared_

I get

mount: /dev/sdb is write-protected, mounting read-only
mount: unknown filesystem type '(null)'

The same does not happen when I try to use a flash drive for example, which I can easily mount.

Answer 1

After setting up RAID, you need to create a filesystem on it with the mkfs command. For example, if you want it to be ext4, you''ll use the command

mkfs.ext4 /dev/sdb

Afterwards, use the command:

blkid | grep sdb 

and you'll see the filesystem in the last column as TYPE="ext4" or whatever filesystem you've chosen. Your mount command will then work.