Hi all, I want to use COSS but I'm not sure if I understand all the options right. So this is what I want: Although our average object size is ca. 27 kB most of the files are much smaller. This is the distribution of about 11 M files from one of our Squids: <1kB: 19585 0,1% <2kB: 583402 5,2% <4kB: 4897854 44,3% <8kB: 1049084 9,4% <10kB: 145059 1,3% <20kB: 351615 3,1% <30kB: 182077 1,6% <40kB: 325084 2,9% <50kB: 597911 5,4% <60kB: 807344 7,3% <70kB: 742066 6,7% <80kB: 527370 4,7% <90kB: 333543 3% <100kB: 206064 1,8% >100kB: 280574 2,5% I want to let Squid do as less IO as possible. So I thought I set "maximum_object_size_in_memory" to 4 kB and "max-size" for COSS to 3x 8kB = 24 kB. The rest goes into AUFS. So my configuration lines would look something like this: cache_dir coss /web/cache/1/coss/ 20480 max-size=24576 cache_dir coss /web/cache/2/coss/ 20480 max-size=24576 [...] cache_dir aufs /web/cache/1/aufs/ 81920 290 256 cache_dir aufs /web/cache/2/aufs/ 81920 290 256 [...] Help is needed with the following things: - "--with-coss-membuf-size" compile-time option is set to 1 MB per default. Does it make sense to change this value? - How big should I make the COSS files? I thought about 20 GB on four disks for COSS and 60 GB on the same disks for AUFS. - How do I understand "block-size"? What values should I use? I can't get my head around the docs in the Squid-Wiki. - All other options for COSS seem to be for specific cases which don't apply here(at least that's what I think). So leaving them at the default values would be my choice. Thanks for any help, Markus