Missing drive?

[salan]

This setup is a learning VM so might not be how you would do things.

I have set up a Ubuntu 19.10 server. SATA controller for DVD and OS disk. Then SCSI controller for app disks. Created 12 disks. The idea being ten in RAID 10 config using mdadm. Two spare hot swap.

So installed server ok. Created a partition on the SCSI disks (here is where things got strange). I am using LSIlogic controller. The disks were partitioned with the command

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sudo fdisk /dev/sdb,c,d,e,f,g,h,i,j,k,l,m

All seemed well. But when I do

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sudo fdisk -l

I only get 11 disks?? When I do sudo fdisk /dev/sdm it says no disk??

I created a raid using :

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sudo mdadm --create /dev/md0 --chunk=256 --level=10 -p f2 --raid-devices=10  /dev/sdb1 /dev/sdc1 /dev/sdd1 /dev/sde1 /dev/sdf1 /dev/sdg1 /dev/sdh1 /dev/sdi1 /dev/sdj1 /dev/sdh1--verbose

All seems fine. md0 created. But where is my other disk? Any ideas?

I was going to add the 2 other disks as spare to the raid.
Alan