How we can set a load balance or load sharing over WAE cluster
Hi, At this time we have a cluster with two WAEs 7341 ( 4 HDD with 300GB each) connected to a Cisco 7609 router, they are communicating using layer 2 for redirect and return packets between them, the WAEs are caching HTTP, DNS, HTTP and FTP-NATIVE, we think in an acceptable perfomance, but we see more load over WAE1 than WAE2. The WAEs have the same configuration, by this behavior the diskS usage from WAE 1 is dramatically highest versus disks usage WAE 2, the traffic amount handled by wae cluster is in average 700Mbits in rush hours.
We are trying to find a way/configuration to achieve a better load balance/sharing like 50/50 for both WAEs. This is our current problem. Thanks for the help you can brings us.
Re: How we can set a load balance or load sharing over WAE clus
It appears that you are using the default mask-assign value of 0x1741. Using the default value will sometimes create a situation where one WAE will be more utilized than the other. You can change the mask-assign value depending on your internal IP addressing scheme which will yield a better ratio of utilization. Below is some information regarding mask-assign values. It was taken from the following link.
Mask assignment can further enhance the performance of L2 redirection. The ternary content addressable memory (TCAM) can be programmed with a combined mask assignment table and redirect list. All redirected packets are switched in hardware, potentially at line rate. The current Catalyst platform supports a 7-bit mask, with default mask of 0x1741 on the source IP address. Fine tuning of the mask can yield better traffic distribution to the WAEs. For example, if a network uses only 191.x.x.x address space, the most significant bit can be re-used on the last 3 octets, such as 0x0751, because the leading octet (191) is always the same.
The following examples show output from show ip wccp 61detail with a mask of 0x7. Notice that four WAEs are equally distributed from address 0 to 7.
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