A couple of DD benchmarks on the RAID-6

Post date: Dec 31, 2011 2:11:04 PM

Read from the block device:

# /usr/bin/time dd bs=1M iflag=direct count=50000 if=/dev/sda of=/dev/null

50000+0 records in

50000+0 records out

52428800000 bytes (52 GB) copied, 28.0986 s, 1.9 GB/s

0.02user 4.94system 0:28.09elapsed 17%CPU (0avgtext+0avgdata 7472maxresident)k

0inputs+0outputs (1major+518minor)pagefaults 0swaps

Write to a big file

# /usr/bin/time dd bs=1M oflag=direct count=50000 if=/dev/zero of=bigfile

50000+0 records in

50000+0 records out

52428800000 bytes (52 GB) copied, 45.0781 s, 1.2 GB/s

0.04user 10.50system 0:45.10elapsed 23%CPU (0avgtext+0avgdata 7488maxresident)k

0inputs+0outputs (0major+520minor)pagefaults 0swaps