Post your performance results

I am easily seeing write speeds of 50MB/sec. I have journaling on, and I am not using Jumbo frames. I think with a small amount of optimization, I could max out the NICs or the CPUs on the ReadyNAS, but either should be considered "really good" speed.

Sample rsync transfer of a few compressed LUN copies (HDD images):

Number of files: 48
Number of files transferred: 25
Total file size: 21878830041 bytes
Total transferred file size: 21878829859 bytes
Literal data: 21878829923 bytes
Matched data: 0 bytes
File list size: 1130
File list generation time: 0.028 seconds
File list transfer time: 0.000 seconds
Total bytes sent: 21881503093
Total bytes received: 704

sent 21881503093 bytes  received 704 bytes  55607379.41 bytes/sec
total size is 21878830041  speedup is 1.00
---- 2009-03-19 19:21:40 finish rsync

rsync server:
ReadyNAS Pro
HDD - 6x 1.5 TB Seagate (write cache on)
RAM - 4 GB
NET - 2x 1 Gb 802.3ad LACP bonded NICs
Journaling: on
Jumbo frames: off

switches:
Cisco ethernet - 3750G
Cisco fiber - 9124

rsync client:
IBM HS20 8843 Blade server
CPU - 2x 3.0 GHz Intel Zeon (HT)
RAM - 4 GB
HDD - SAN - LUN Raid5(3) via QLogic 2312 1x 2 Gb Fiber to Xiotech Mag3D 48 drive (non-idle)
OS - Ubuntu v6.06
rsync compression was off, not using SSH

I am easily able to pull 150 MB/sec with this machine, and depending on the current SAN load it can peg at around 200 MB/sec (SAN has faster IO than server's 2 Gb Fiber connection). The above was done while SAN was under normal load, with no configuration changes done to optimize speeds (standard everyday setup). I also transferred a much larger data set than the RAM in the ReadyNAS, so full caching was not a factor for speed shown.

This Pro just flat out blows the doors off the NV+ (as expected). If you need speed, get the Pro.