RE: [squid-users] Procedure for changing cache size

> I started to reply to Marc's message with a rider that his answer only
> applied if you change the size parameter when you asked the question I
> was about to answer. :-)

I'm just trying to keep things in the proper order. :)

I ran some calculations and changing the number of directories wasn't
going to be a _big_ issue. (Actually, I found that I had miscalculated
last time, and the number of directories would be [more] correct
with the new cache size, so I didn't change it. <end_of_rationalization>)

> In addition if you configure a significant decrease squid will
> definitely thrash around for a while expiring stuff until it gets back
> below your low water mark (see cache_swap_low in squid.conf.)

Yes, I was a bit worried when I saw the first couple of errors pop up
in cache.log, but then I saw that the number was being reduced and
realized what was going on.

Thanks for the response!

Rick

> -----Original Message-----
> From: Lightfoot.Michael [mailto:Lightfoot.Michael@comcare.gov.au]
> Sent: Thursday, November 28, 2002 6:58 PM
> To: Squid List
> Subject: RE: [squid-users] Procedure for changing cache size
>
>
>
>
> > -----Original Message-----
> > From: Rick Matthews [mailto:RedHat.Linux@verizon.net]
> > Sent: Friday, 29 November 2002 3:25 AM
> > To: Marc Elsen; Rick Matthews
> > Cc: Squid List
> > Subject: RE: [squid-users] Procedure for changing cache size
> >
> >
> > > Just put the new size of the cache_dir in squid.conf and
> > >
> > > 'squid -k reconfigure'.
> > >
> > > It will trim the cache dir(s) automatically.
> >
> > That's all there is to it? Even if I'm changing the number of
> > directories, too?
>
> I started to reply to Marc's message with a rider that his answer only
> applied if you change the size parameter when you asked the question I
> was about to answer. :-)
>
> In addition if you configure a significant decrease squid will
> definitely thrash around for a while expiring stuff until it gets back
> below your low water mark (see cache_swap_low in squid.conf.) Best to
> avoid doing this when users are active as performance will suffer.
>
> If you decrease the directory level numbers I don't know exactly what
> happens. I would suggest that stopping squid and deleting swap.state
> and the "surplus" directories might be the best approach in that case.
> Maybe you should try an experiment on a test cache. I might see what
> happens on mine later today if Murphy stays at home. :-)
>
>
>
>
> Michael Lightfoot
> Unix Consultant
> ISG Host Systems
> Comcare
> +61 2 62750680
>
>
>
>
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Received on Thu Nov 28 2002 - 19:33:58 MST