On Sat, 13 Sep 2003 23:49:16 -0600 Jacob Anawalt <[EMAIL PROTECTED]> wrote:
> Joachim Förster wrote: > > >Hi! > > >On Fri, 12 Sep 2003 14:47:04 -0600 (MDT) "Jacob Anawalt" <[EMAIL PROTECTED]> wrote: > > > > >>Tom Allison said: > >> > >> > >>>Jacob Anawalt wrote: > >>> > >>> > >>>>Joachim Förster said: > >>>> > >>>> > >>>> > >>>>>Does anybody know, why squid uses the harddisk although its (empty disk > >>>>>cache, logs and other status files are on the tmpfs)? > >>>>> > >>>>> > >>>>> > >>>>I don't know why it uses the hard disk, but if it is only reading those > >>>>files and there is enough memory that they are cached in the kernel file > >>>>cache, then perhaps the atime is being updated and that is causing the > >>>>disk to spin up? > >>>> > >>>>Are you mounting with the noatime option? > >>>> > >>>>Maybe there's another http proxy that doesn't require any disk access? > >>>> > >>>>I am interested in following this thread. I would like to set up a > >>>>similar > >>>>computer, with as few fans and spinning drives (zero would be ideal) as > >>>>possible while staying inexpensive and low-power. > >>>> > >>>> > >>>> > > > > > >>For me, squid disk access while someone on my internal network is using > >>the proxy is not an issue. If squid were spinning up the drive when > >>'nothing'* is happening, calling sync()/fsync() for some odd reason then > >>that would be annoying. I'm running a gateway w/ squid right now, but I > >>haven't tried to stop the disk from spinning when squid is running. > >> > >> > > >Well, in the end I in fact want to have a PC without spinning up the disk at all, > >even when somebody is using it. When somebody is using sshd it whould be OK, but > >the use of dhcpd, squid*, isdnutils, dnsmasq should not bring up the disk. > > >*squid only with RAM cache, no disk cache! > > Cool. I look forward to the details on what you had to tweak to get this > :) Maybe send some tips to that silent-linux site I referenced. > > > > > > >>I am unclear from Joachim's email if Squid is spinning up the disk all the > >>time for him, every x seconds, or only when the proxy is being used. If > >>it's only the latter then for my needs that's OK. > >> > >> > > >Sorry, for me squid is spinning up the disk all the time, even when not in use. > > > > > >>It still seems odd if writes are spinning up the drive with the read only > >>setting. Maybe some file squid wants to read keeps being dropped from file > >>cache between accesses because other programs or more frequently accessed > >>files are using all the memory? (Ie, because squid is set to use XMb in > >>memory, is there still enough free memory to cache all the files squid > >>wants to read. Add to that all other running program's requirements.) > >> > >> > > >I don't know. I moved the whole /var and /tmp things of squid to a tmpfs, so the > >files are in memory? > > How much memory does this computer have? Hopefully lots. Hmmm, only 64MB. I think it could be too less. > You've got /var and /tmp in tempfs, squid's suppose to be doing all it's > cache in memory, and any other program you're running that's not under > inetd/xinetd but is running as a daemon is in memory. Is there enough to > cache all of the files needed from /etc and binary/data files in /usr > for all these programs? I think that this is the problem ... > Squid has lots of files in /usr/lib/squid like /usr/lib/squid/errors/* > and /usr/lib/squid/icons/*. They shouldn't be being looked at every > minute to keep noflushd from being able to spin the disk down, and even > if they were, if there is enough free memory the kernel can cache those > reads. The files in /usr/lib/share are not that huge. Moving them to tmpfs should be no problem. I tried this yesterday (with a chroot jail), but till now I haven't been successful, because there is something wrong with my chroot jail (see my other mail/answer to Stephan's mail I think). > Unless someone else answers soon with some pertinant "how to run a > diskless squid cache" answers and you have oodles of memory even with > all the tempfs data and whatever you have the squid cache memory set to, > I suggest posting to the squid-users list found at > > http://www.squid-cache.org/mailing-lists.html#squid-users > > I am interested in knowing what you learn, even though 100% diskless > isn't my goal, I don't want squid to keep the disk spinning when no-one > is accessing the proxy. Ok. > Since your goal is to have almost 100% no disk access, perhaps the LEAF > project mds mentioned would be the best bet. I haven't looked at it, so > I don't know how it meets your needs. Last evening I was on leaf.sourceforge.net and studied the feature lists. The thing which is missing from all (or I didn't see it), is the ISDN support. Perhaps I have to look on other sites, too ... Anyway I think LEAF shall be my last try. In fact I don't want to give up Debian (on my gateway machine :). Joachim -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
