QOS one of the most important technology which is so important nowdays for traffics which are passed through network.As you mentioned above you have two types of traffic (Data and Voice) , you can do QOS which can help you to classify your traffic and do marking for the traffic , then at any congetion due to any problem on the network by QOS you can drop the least important traffic. The QOS should be done on your Cisco switches globally on the switches and per ports. Please refer to Cisco QOS SRND.
for trunks ports , you have to use trust DSCP , under the ports which connected to Cisco phones you have to use trust mls cos.Yes , you have to enable under physical interface. To enable port channel under port channel this is not supported on all devices , only support on cores as ASR , GSR , 6500.
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Do you really need QoS? That's an "it depends" answer.
If you have ports which ever congest to the degree it's adverse to the network service requirements of an application, then you may need QoS. Notice I wrote "may need" because QoS cannot "solve" all congestion issues. (BTW, there's also a widely held belief that adding bandwidth is the solution to all congestion issues. Well it can be, but sometimes it can be outrageously more expensive, even on LANs, than using QoS to solve a congestion issue.)
These are the paths to get to each CCX logs through CLI. They may be helpful if you are having issues accessing RTMT or downloading logs through it.
If you want to download them you have to prefix "file get " and you can add one of the options (re...