Adrian Chadd <adrian@xxxxxxxxxxxxxxx> writes: > On Tue, Sep 18, 2007, Nicole wrote: > >> Thanks for the clarification, but Eeek! > > Whats eek about it! > >> So then, I guess this raises the question: If you have plenty of >> disk, there really is nothing from keeping ancient files hanging >> around, using up space and enlarging your swap.state file? > > Squid will clean it for you! Relax. > >> I thought it was an either not enough space Or older than expire >> time would delete objects. > > It'd mean more RAM used to track expired objects, and more CPU to walk > the list and delete unneeded objects.. And probably longer disk seek time. >> So it seems like, I either have to manually purge old files every so >> often, or set my disk space artificially to prevent too many objects >> based on my servers's memory or increase my memory? > > Nope, you just need to: > > * cron a squid -k rotate once a day to make sure swap.state (and your > other log files) don't grow to infinity! So many people forget this > step. > > * Relax, and let squid handle deleting files when it wants to. It'll > delete old files to make room for others as appropriate! Agreed. We still have to make sure that cache_dirs match server memory however, as I'm seeing a scenario right now that if we make full use of all the available disks, a single Squid instance will eat up dozens of gigabytes of physical memory, which is far more than what we've installed on the server. I'm also seeing a scenario that 10GB of cache_dirs get roughly the same hit ratio as 30GB of cache_dirs due to cache pollution, so cache_dir which is larger than necessary is not always a good idea. > Now, the question you should be asking is "will legitimate but > infrequently used files be deleted in preference to "stale" files, and > will this make my disk use suboptimal?" > > The answer, thankfully, is no - if you think about it, if a file is > stale then: > > * it hasn't been accessed in a while (or its freshness would've been > "updated" and it suddenly isn't stale/expired anymore!, and > > * if it hasn't been accessed in a while, it'll be at the tail end of > the LRU or Heap anyway. > > > Adrian > > -- > - Xenion - http://www.xenion.com.au/ - VPS Hosting - Commercial Squid Support - > - $25/pm entry-level bandwidth-capped VPSes available in WA -
