Re: [squid-users] coss storage scheme.

Hey Chris,

Could you comment on the "Internal Marker Objects", as in, are they
stored just in COSS or elsewhere too?

Thanx.

On Thu, 2010-01-07 at 10:21 -0800, Chris Woodfield wrote:
> One thing we've noticed is that until the COSS store is rebuilt, no objects get saved to it (each attempt shows up as SO_FAIL in cache.log). Complicating this further is the fact that -F doesn't seem to work for COSS rebuilds - I know I opened a bug on this but I can't seem to find it at the moment...
>
> -C
>
> On Jan 6, 2010, at 5:18 PM, Manjusha Maddala wrote:
>
> >
> > On a related note,
> >
> > if Squid is configured to use AUFS and COSS for its cache_dirs, does it
> > store the "Vary Internal Marker Objects" only in the COSS file or
> > somewhere else too? For my setup, I notice the marker objects which
> > provide "vary" meta-data for all the cached pages are stored in COSS.
> >
> > If there is a COSS cache_dir, Squid attempts to store all the cached
> > objects less than the max_size for COSS object in the COSS file. As a
> > result, some of the "Internal Marker Objects" get evicted out (during
> > COSS recycle) thereby resulting in low cache hit ratio for my setup.
> >
> >
> >
> > On Wed, 2010-01-06 at 16:58 -0800, Chris Robertson wrote:
> >> Jeronimo Garcia wrote:
> >>> Hi all.
> >>>
> >>> I've been looking at a bunch of benchmarks about storage schemes for
> >>> squid and coss looks
> >>> rather impressive , but , reading squid the definitive guide i got to
> >>> know that the code might be a bit beta/unstable.
> >>>
> >>
> >> http://wiki.squid-cache.org/Features/CyclicObjectStorageSystem
> >>
> >>> Now i didn't really check when this book was written but I've been
> >>> coming across with it for a bunch of years already so i imagine is not
> >>> very new.
> >>>
> >>> Does some of you have some real experiences with coss?
> >>
> >> Squid 2.7STABLE6
> >>
> >> My COSS dirs are about 45 GB each on bare partitions (cache_dir coss
> >> /dev/sdc1 46080 max-size=51200 max-stripe-waste=32768 block-size=4096).
> >> Each server passes about 100 GB of traffic per day (to my customers,
> >> ~25% from cache), with a peak requests/second of around 150. No issues
> >> with stability (currently I have over 50 days of uptime).
> >>
> >>> I'm also very
> >>> interested on squid's start-up time when using coss.
> >>>
> >>
> >> Squid starts up just fine but thrashes the disks hard for about half an
> >> hour while it reads the COSS dirs to build the index. There is no
> >> noticeable effect on performance.
> >>
> >>> Many Thanks
> >>> -J
> >>>
> >>
> >> Chris
> >>
Received on Thu Jan 07 2010 - 18:28:09 MST