Filesystem Size Used Avail Use% Mounted on
/dev/md0 7.9G 1.5G 6.3G 20% /
devtmpfs 16G 0 16G 0% /dev
tmpfs 16G 244K 16G 1% /dev/shm
tmpfs 16G 20M 16G 1% /run
tmpfs 16G 0 16G 0% /sys/fs/cgroup
tmpfs 16G 1.9M 16G 1% /tmp
/dev/mapper/cryptvol_2 1.8T 1.2T 591G 67% /volume2 NVME WD Black SN850 RAID1 2*2 TB
/dev/mapper/cryptvol_1 849G 36G 813G 5% /volume1 Samsung SM883 Basic 960 GB
/dev/mapper/cryptvol_3 11T 3.0T 7.6T 29% /volume3 Seagate Ironwolf RAID10 4*6 TB
tmpfs 1.0T 0 1.0T 0% /dev/virtualization
root@DS1621xs:~# dd if=/dev/mapper/cryptvol_2 of=/dev/null bs=10M count=500
500+0 records in
500+0 records out
5242880000 bytes (5.2 GB, 4.9 GiB) copied, 3.62031 s, 1.4 GB/s
root@DS1621xs:~# dd if=/dev/mapper/cryptvol_1 of=/dev/null bs=10M count=500
500+0 records in
500+0 records out
5242880000 bytes (5.2 GB, 4.9 GiB) copied, 9.25211 s, 567 MB/s
root@DS1621xs:~# dd if=/dev/mapper/cryptvol_3 of=/dev/null bs=10M count=500
500+0 records in
500+0 records out
5242880000 bytes (5.2 GB, 4.9 GiB) copied, 11.0818 s, 473 MB/s