Hi All I have submitted long time ago http://www.squid-cache.org/bugs/show_bug.cgi?id=1820 Seems it is taken as not serious bug. But if you need proper testing, and catch small bugs, i guess feature must be relatively stable. On my expirience, i have 5 busy caches (around 200 req/s and more), and i am trying to run COSS about 1 month. As another submitter reported - if COSS damaged, it's just going to loop and restarting non-stop, damaging caches content more and becoming completely useless, till someone fix a problem. I think it will be useful, if COSS will ignore and clean object which failed. And really many people need it, because already there is chance squid will crash on some operations, and very high chance COSS will get corrupted, and i will need to "zero" all cache. -- Virtual ISP S.A.L.