- 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].