I have just set up mdadm for RAID0 with two 5400rpm 2.5'' HDDs.
By performing a write speed test using dd:
dd if=/dev/zero of=./largefile bs=1M count=3000
3000+0 records in
3000+0 records out
3145728000 bytes (3.1 GB, 2.9GiB) copied, 0.986443 s, 3.2 GB/s
which obviously doesn't make sense - tested with copying and opening files, the drive does work all right though.
Anyone knows what's going on here?