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Re: coss storage scheme.

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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
>> 



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