Hi, we restarted our Varnish instance on Sunday 7th around 19:00.
On Wednesday 10th 9:45 the child process restarted (causes unknown) -- loosing the existing cache. ... the cache slowly grew again .... On Wednesday 17th around 2:00, the cache was somehow flushed, loosing about 75% of its objects. ... the cache slowly grew again .... On Wednesday 24th at 2:00, the cache was flushed again, loosing about 85% of its objects. On each of these occasions our cache hit rate went down from ~90% to under 50%. Needless to say this is highly undesirable. What might be causing this behaviour? Any hints and directions helping research welcome. Thanks. More details: Varnish version: 2.1.5 (Debian lenny package 2.1.5-1~lenny4) O.S.: Linux s229-161 2.6.38 #1 SMP Sat Mar 26 09:51:44 CET 2011 x86_64 GNU/Linux MRTG daily graphs for cache size and objects in cache: [image: varnish_cache-day.png] [image: varnish_objects-day.png] Note how the two graphs are slightly different: size goes down between 2:00 and 15:30, object count goes down suddenly at 15:30. Main VCL file attached (long to read -- feel free to ask questions). -- Jordi Salvat i Alabart CTO & Project Manager Salir.com +34 676 49 86 00
<<varnish_objects-day.png>>
<<varnish_cache-day.png>>
salir.vcl
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