Yes you are right about asking of lot of questions at once. i be careful. + Thank you ---------------------------------------- > Date: Fri, 19 Mar 2010 16:44:18 +0100 > From: mromani@xxxxxxxxxxxxxxx > To: gigoz@xxxxxxx > CC: squid-users@xxxxxxxxxxxxxxx > Subject: Re: Cache_dir size considerations > > GIGO . ha scritto: >> Well i want to make sure that my settings are optimized and want to >> learn more about the cache_dir settings.....let me come in details > > Gigo, > you are asking a lot of questions all at once. > This is a volounteer-based support list, so your chances of getting > (good) responses are maximized if you ask specific questions, one or two > per post (possibly related). > > That said, I'll try to answer with what I know... > >> >> >> I have installed squid3stable24 on Ubuntu 8.04 on IBM 3650 X series >> server with two hard disks on which physical RAID1 is implemented. I >> am to use the Squid Server for 1000 users out of which 250 are power >> usrs rest of them are normal users for which there are many >> restrictions(youtube,facebook,msnmessgenger,yahoomessenger,mp3mpg >> etc...). > > OK > >> >> I have done my settings specifically to ensure that windows updates >> are cached and my maximum_object_size is 256 mb. Also i am looking >> forward to cache Youtube content(for which i have no updated script >> and settings so far the one on internet is with storeurl directive >> which is depricated)....... >> >> >> Now my cache directory size is 50 gb with 16 L1 and 256 L2. I think >> better would be >> >> Cache_dir_size aufs 50 GB 48(L1) 768(L2) >> >> >> as far as L1 & L2 settings i am clear that there should be no more >> than around 100 file in L2 directories so one's settings should be >> adjusted accordingly. However i am confused that if setting your >> cache (50gb) of too large a size will have anything to do with your >> performance. Secondly at the moment the cache directory is >> implemented on the same hard drive on which OS is installed. I know >> that cache should be better moved to a spare hard drive. But what >> about the highavailability? Failure of a disk cud result in the >> failure of proxy? > > To maximize performance you want 1 disk for OS and logs, and one disk > per cache_dir, without any RAID. > With only two disks, obviously if either one dies you have an out of > service. > So to achieve ha squid you'd neeto to have two phisical squid boxes, I > think. Haven't tried myself, so i cannot guide you on how to set that up... > >> >> Another confusion which i have is that what about the >> cahe_effective_user i hav set my user >> >> cache_effective_user proxy but i dont have much concepts about it. I >> have read on SAN institute site a white paper published 2003 that >> squid should not be run as nobody user but as a sandbox user with >> noshell. However i am not sure what is it all about and whether this >> informaiton is still valid after 7 years have been passed. > > Squid should not be run as root. > You should have a dedicated user account for it. > Squid cache dirs should be rw by that squid account, obviously. > I belive most distros (at least server-oriented ones) take care of this > setup when you install squid via package manager. > >> >> Please also guide me that what are the risks involved with this >> setting which i have done for windows update: >> >> range_offset_limit -1 maximum_object_size 256 MB quick_abort_min -1 > > No risk, but if a user interrupts a huge download, squid will continue > it until it finishes, possibly wasting a lot of bandwidth on the wan side. > >> >> >> Further after giving squid too many longs list of blocked site say >> containg 100+ sites. I have noticed that its slowed down however i am >> not sure that if it is the reason? please guide...... >> > > Well, blocking sites involves checking every request's url against all > the sites in the blacklist. This might have a noticeable impact on the > server load. Also, if you have many regexes in the blacklist(s) the load > will be significantly higher. > You might want to have a look at squidGuard or other external helper, to > take advantage of the multiple CPU cores your server might have. > >> >> Please guide in detail it will be really beneficial for me as concept >> building...i would be really thankful.. >> >> regards, >> >> > > HTH > >> >> >> >> >> ---------------------------------------- >>> Date: Wed, 17 Mar 2010 11:00:22 +0100 From: mromani@xxxxxxxxxxxxxxx >>> CC: squid-users@xxxxxxxxxxxxxxx Subject: Re: >>> Cache_dir size considerations >>> >>> GIGO . ha scritto: >>>> The total amount of Ram on the server is 4 GB with cache_mem >>>> parameter set to 1 GB. >>>> >>> IMHO there's plenty of HW for squid to run smoothly. But it also >>> depends on the amount of traffic. >>> >>> I'm sorry but I think I don't get your point... what is exactly the >>> problem you're having ? >>> >>> -- Marcello Romani >> _________________________________________________________________ >> Your E-mail and More On-the-Go. Get Windows Live Hotmail Free. >> https://signup.live.com/signup.aspx?id=60969 > > > -- > Marcello Romani _________________________________________________________________ Hotmail: Trusted email with powerful SPAM protection. https://signup.live.com/signup.aspx?id=60969
