HI Sudheer, Acording to the document of “volume.conf”, it seems I can not assign ramdisk to one specified volume:
http://trafficserver.readthedocs.org/en/latest/admin-guide/files/volume.config.en.html Each volume is striped across several disks to achieve parallel I/O. For example: if there are four disks, then a 1-GB volume will have 256 MB on each disk (assuming each disk has enough free space available). So do you mean any other plugins? Thanks, Thomas. --------------------------------------------------------------------------------- [cid:[email protected]] 赵春波 Thomas CDN架构师 邮箱 : [email protected]<mailto:[email protected]> 手机：(+86)18511746860 地址：北京市海淀区小营西路33号金山软件大厦3F 邮编：100085 --------------------------------------------------------------------------------- From: Sudheer Vinukonda [mailto:[email protected]] Sent: Saturday, April 16, 2016 10:58 AM To: ZHAOCHUNBO [赵春波]; [email protected] Subject: Re: 答复: ram_cache for big objects I haven't had to rely on page cache with ATS (unsure it'd work reliably, given ATS's appetite for memory - ram cache + non ram cache). But, you can configure multiple cache partitions with the required files mapped to ramdisk (using volumes) and the rest mapped to regular disk. Cache volumes allow mapping based on host name (hosting.config). If the domain is not unique, you can modify the cache key to add a special domain name for the files needed and store them in the volumes that are tied to the ramdisk. http://trafficserver.readthedocs.org/en/latest/admin-guide/storage/index.en.html#partitioning-the-cache http://trafficserver.readthedocs.org/en/latest/admin-guide/files/hosting.config.en.html#std:configfile-hosting.config On Friday, April 15, 2016, 7:27 PM, ZHAOCHUNBO [赵春波] <[email protected]<mailto:[email protected]>> wrote: Hi Sudheer, Thank you very much for you suggestion. But I think ramdisk is not suitable for my case. There are many other files in the same domain, the storage requirement is larger than my ram storage. Only several of them are hot files, may I have a way to make ram_cache or linux pagecache work? Thanks in advance, Thomas. ________________________________________ 发件人: Sudheer Vinukonda [[email protected]<javascript:return>] 发送时间: 2016年4月15日 23:47 收件人: [email protected]<javascript:return> 主题: Re: ram_cache for big objects One approach is to use a ramdisk (e.g configure tmpfs ). On Friday, April 15, 2016 12:33 AM, ZHAOCHUNBO [赵春波] <[email protected]<javascript:return>> wrote: HI all, I have met one problem: There is one big file(600MB) and it is very hot, it is larger than ` ram_cache_cutoff ` setup: CONFIG proxy.config.cache.ram_cache_cutoff INT 20M I have noticed that the `rKB/s` on one disk is very high, and the disk usage is keeping nearly 100%. Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await svctm %util sde 0.00 124.00 196.33 2.33 47210.00 505.33 480.36 35.17 182.13 5.02 99.73 It seems linux pagecache does NOT work when using ATS, and ATS ram_cache does not work either, am I correct? What is the suggestion value of `proxy.config.cache.ram_cache.size` and `proxy.config.cache.ram_cache_cutoff` ? How should I handle this case? Thanks in advance. --- Best Regards, Thomas
