This supermicro server is ordered via dell. Original order can be found here

• intel XEON E5-2620V4 2.1GHz 2x
• DDR43 32GB ECC 4x → 128Gb
• LSI MegaRaid SAS 9211 host controller
• Seagate 6TB SAS 7x
• Samsung 850 pro 256Gb SSD 2x

Ubuntu 16.04 LTS is installed on the /dev/md0, which contains the 2 SSD's in raid1 (software RAID).

cat /proc/mdstat
Personalities : [raid1] [linear] [multipath] [raid0] [raid6] [raid5] [raid4] [raid10] 
md0 : active raid1 sdb1[1] sda1[0]
      234243072 blocks super 1.2 [2/2] [UU]
      bitmap: 0/2 pages [0KB], 65536KB chunk

There is a zfs pool created with 2 VDEV's in a raidz2 (can tolerate 2 drive failures) configuration, each VDEV containing 5 disks each.

zpool status
  pool: data
 state: ONLINE
  scan: scrub repaired 0 in 0h0m with 0 errors on Sun Mar 11 00:24:02 2018
config:

        NAME        STATE     READ WRITE CKSUM
        data        ONLINE       0     0     0
          raidz2-0  ONLINE       0     0     0
            sdc     ONLINE       0     0     0
            sdd     ONLINE       0     0     0
            sde     ONLINE       0     0     0
            sdf     ONLINE       0     0     0
            sdg     ONLINE       0     0     0
          raidz2-1  ONLINE       0     0     0
            sdh     ONLINE       0     0     0
            sdi     ONLINE       0     0     0
            sdj     ONLINE       0     0     0
            sdk     ONLINE       0     0     0
            sdl     ONLINE       0     0     0

errors: No known data errors

This gices us almost 55TB of storage capacity.

zpool list
NAME   SIZE  ALLOC   FREE  EXPANDSZ   FRAG    CAP  DEDUP  HEALTH  ALTROOT
data  54.5T  1.51T  53.0T         -     1%     2%  1.00x  ONLINE  -