03-24-2012 02:07 AM
Hi
How to Calculate / Estimate / even test the needed values for tcp max-bandwidth-mbps , min-available-bandwidth-mbps and round-trip-time-ms when configuring FCIP connection between different sites
between MDS Cisco 9513 and 9216 i Switches
I have a speed upgraded to 4 times the old speed
thats for Replication
and how to test latency if possible
Kindly advise
03-27-2012 12:07 PM
Sami,
To measure the RTT use the command, "ips measure-rtt
To determining min/max bandwidth I would recommend working with your WAN team to determine what your expected bandwidth should be as they may be limiting you or guarateeing you with QOS. For example use the following questions with them:
What is the maximum amount of bandwith that is being allocated to FCIP traffic by the LAN/WAN?
For the min value, asking "What is the minimum amount of bandwidth that is guarenteed by the LAN/WAN?"
You can use various methods to test the speed of the FCIP tunnels such as the MDS CLI "san-ext-tuner" or use your arrays with valid data (the luns could be full of zeroes which would give you false stats due to them being compressed). You could either fill the luns with valid data or disable compression. Then watch the stats on the GigE ports (post compression stats) or the FCIP tunnels (pre-compression stats).
-Seth
03-27-2012 01:19 PM
03-27-2012 01:44 PM
Sami,
SET is basically a load generator, like IOMeter but for FCIP traffic, it creates a virtual initator and target and generates a stream of reads or writes. You would then use other tools to measure at various locations. SET does provide some basic performance numbers, but I would recommend using other CLI or DCNM/DeviceManager based tools to see traffic.
-Seth
03-27-2012 01:51 PM
ok thanks setmason
I will look for some ways to measure and determine the best values as min and max
will check again with the network team if they can help me with alo
Regards
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