- Apr 22, 2012
And my results:It works out to some crazy number:
Write: 1548.58 MB/s
Read: 2215.21 MB/s
Of course this is too good to be true which means it is! You have compression enable for your volume. Zeros are highly compressible. Turn off compression for the volume when benchmarking. I checked and this isn't mentioned in post #1 or anywhere on the first page.
# dd if=/dev/zero of=/mnt/tank/tmp.dat bs=2048k count=50k 51200+0 records in 51200+0 records out 107374182400 bytes transferred in 95.500761 secs (1124328029 bytes/sec) # dd of=/dev/null if=/mnt/tank/tmp.dat bs=2048k count=50k 51200+0 records in 51200+0 records out 107374182400 bytes transferred in 113.580486 secs (945357659 bytes/sec)
For my true results see [post=26680]above[/post].