RE: [squid-users] Changing cache location

On Tue, 2003-03-11 at 14:21, Lightfoot.Michael wrote:
> > -----Original Message-----
> > From: Gary Hostetler [mailto:whostet@nccvt.k12.de.us]
> > Sent: Tuesday, 11 March 2003 11:21 AM
> > To: squid-users@squid-cache.org
> > Subject: [squid-users] Changing cache location
> >
> >
> > I want to change my cache from the default in squid to
> > /home/cache where the partition size is 31 gigs and I want to
> > reduce the cache size from 25 gigs to 21 gigs. When I tried
> > it it failed. When I set it back to the default it wouldn't
> > work until I put the original file size back in which was 25
> > gigs. I want to reduce to 21 gigs as recommended by some
> > people (70% of partition) and set it to /home/cache/. Did I
> > need to delete the default cache directory and how will that
> > affect the swap file there.
> >
> The simplest is to blow away the current cache after changing squid.conf
> and restart it all with squid -z. Others may confirm this, but I
> suspect that you can't change the name of the cache directory and
> preserve the cache unless you delete the swap.state file and let squid
> rebuild it by reading every cache directory.

swap.state doesn't care about cache dir names. Squid's conf is what
associates the state file with the cache dir.

> You can reduce your cache size by changing the size in squid.conf then
> waiting until squid unlinks enough files to reduce the size to what you
> want. This naturally takes some time, squid will not simply start
> deleting objects wholesale, it will gradually adjust itself to the new
> regime.

Pretty quickly actually: IIRC it'll unlink O(10) objects per IO cycle
until the space has dropped to 95% of the squid.conf maximum. (At 200 IO
cycles per second on an unloaded squid, thats 2000 objects per second).

Rob

-- 
GPG key available at: <http://users.bigpond.net.au/robertc/keys.txt>.