gistfile1.txt

[root@i-73352099 data]# dd if=/dev/zero of=./test0 bs=8k count=1000k
1024000+0 records in
1024000+0 records out
8388608000 bytes (8.4 GB) copied, 131.987 s, 63.6 MB/s


[root@i-73352099 logs]#  dd if=/dev/zero of=./test0 bs=8k count=1000k
1024000+0 records in
1024000+0 records out
8388608000 bytes (8.4 GB) copied, 255.829 s, 32.8 MB/s

[root@i-73352099 data]# dd if=/dev/zero of=./test_zero bs=16k count=5000k
5120000+0 records in
5120000+0 records out
83886080000 bytes (84 GB) copied, 1409.11 s, 59.5 MB/s

[root@i-73352099 logs]# dd if=/dev/zero of=./test_zero bs=16k count=5000k
5120000+0 records in
5120000+0 records out
83886080000 bytes (84 GB) copied, 2817.9 s, 29.8 MB/s

Single EBS volume

[root@i-740deb94 data]# dd if=/dev/zero of=./test_zero bs=16k count=5000k
5120000+0 records in
5120000+0 records out
83886080000 bytes (84 GB) copied, 1473.48 s, 56.9 MB/s

Single ephemeral SSD:

[root@i-8d928667 mnt]# dd if=/dev/zero of=./test_zero bs=16k count=1000k
dd: writing `./test_zero': No space left on device
972465+0 records in
972464+0 records out
15932862464 bytes (16 GB) copied, 231.629 s, 68.8 MB/s

mdadm raid 2 SSD ephemeral:

[root@i-8d928667 local]# dd if=/dev/zero of=./test_zero bs=16k count=1000k
1024000+0 records in
1024000+0 records out
16777216000 bytes (17 GB) copied, 89.5293 s, 187 MB/s

mdadm radi 2 SSD ephemeral:

[root@i-8d928667 local]# dd if=/dev/zero of=./test_zero bs=16k count=2000k
dd: writing `./test_zero': No space left on device
1954935+0 records in
1954934+0 records out
32029646848 bytes (32 GB) copied, 149.583 s, 214 MB/s