----- Original Message ----- > Hi Team, > > I would like to know few performance related information. We have capacity > planning meeting for setting up a new cluster with AT. So your input will > be a great value add in our capacity planning. > > Questions: > 1) YTS(Yahoo Traffic Server) has some performance optimization which > utilizes the RAID-10 level for effective cache lookup. Does this ATS also > holds the similar type of feature which will gel well with RAID 10 level. > If not we will go ahead with RAID 0 to save more disk space for larger > cache. Currently we have 300GB cache on each ATS nodes.
Given that Yahoo has switched from using YTS to using ATS, it's probably safe to say that they consider the performance to be, at least, sufficient. Generally, the recommendation is to not use RAID at all. If you are running on bare-metal, just give all the disks you are intending to use as cache directly to ATS. It can handle the balancing itself. you can find more detail and pointers here: https://trafficserver.readthedocs.org/en/latest/admin/configuring-cache.en.html > 2) How does ATS scales with respect to CPU , Memory, Disk? We have our CPU: when compiling with --enable-hwloc (highly recommended) much, much better. Memory: We've recently increased the RAM cache backing by an order of magnitude. IIRC, that means that for your 300 G disk(s) ATS will now use 3G RAM. Disk: we spawn one thread for each disk spindle (all the more reason to not use RAID and directly expose disks to ATS). > current production running with YTS and 16GB ram. Will ATS scale its > performance If I am getting 24GB ram ? How ATS will scale with respect to > hardware. Can you please give some insight about it. Generally we try to auto-scale with the underlying hardware. But you can always make adjustments to fit your load and working set. > 3) What is the QPS of current ATS? > > PS: Please treat this email as high priority, all your inputs will be > valuable to me. This is a user and developer mailing list of an open source project. Many people here are volunteers, and, while others are paid to work on ATS, they do that for paying customers. If you wish to become their highly prioritized paying customer, you can look select from one of https://trafficserver.apache.org/assistance.html > Regards, > Karthick > So long, ++ i Igor Galić Tel: +43 (0) 664 886 22 883 Mail: [email protected] URL: http://brainsware.org/ GPG: 8716 7A9F 989B ABD5 100F 4008 F266 55D6 2998 1641
