Hi Netpros, We have been doing a POC with one of our healthcare customers who are using radiation imaging using DICOM/PACS standards. We are evaluating benefits of WAAS with respect to this specific application. Expectations from the customer are two-fold:
a. Reduce the transfer time of images between application and endhost (radiation device) b. Optimize WAN bandwidth and perform consistently with varying network performance (latency and packet loss) Referring to this Cisco whitepaper on this topic: http://www-v6.cisco.com/c/dam/en/us/td/docs/solutions/Verticals/waasapno... <http://www-v6.cisco.com/c/dam/en/us/td/docs/solutions/Verticals/waasapnotes.pdf> POC is conducted with various features turned on in WAAS - 1. TFO only 2. TFO with LZ and LZ 3. TFO with DRE-adaptive Observations are below: 1. TFO only - Could not see any benefit compared to without WAAS turn on 2. TFO and LZ - Could see benefits shown in WAAS CM (18% between original and optimized traffic). But there is no improvement on the transfer time. Also the peak bandwidth remains the same on the WAN 3. TFO, DRE adaptive and LZ - See huge benefits due caching - both on bandwidth savings and transfer time Since customer would not typically re-transmit the same images multiple times in a day, caching is not applicable to customer network. Below are the clarifications and recommendations that we seek after the POC: a. With compression enabled, this would also improve the transfer time of images. We are not seeing it though. Can this be related to compression and decompression time taken by vWAAS which is off-setting the end to end WAN latency (50ms). Or any settings to be enabled to see transfer time improvements? b. For TFO to be effective, do we have to increase the buffer size and window size? c. Any recommendations on the WAAS settings specific to DICOM image transfer? Thanks in advance, Arun _______________________________________________ cisco-nsp mailing list cisco-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
