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Mem Cache flush

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Hi all.

I'm having an issue with our cache. its a 2.6S17 on centOS 4 x86_64 with 3GB Ram 2x36GB scsi disk for cache_dir and separate SATA 80GB for system. It seem to flush the mem cache for no apparent reason.. nothing in the cache log around the time of occurance... please see the graph in the following link.. it has done it twice in 10 days. we've not encountered such issue.

relative squid.conf settings follows:

cache_mem 1024 MB
maximum_object_size_in_memory 16 KB
cache_replacement_policy heap LRU

cache_dir aufs /sda1/cache0 8000 20 256
cache_dir aufs /sda1/cache1 8000 20 256
cache_dir aufs /sda1/cache2 8000 20 256
cache_dir aufs /sda1/cache3 8000 20 256
cache_dir aufs /sdb1/cache0 8000 20 256
cache_dir aufs /sdb1/cache1 8000 20 256
cache_dir aufs /sdb1/cache2 8000 20 256
cache_dir aufs /sdb1/cache3 8000 20 256

maximum_object_size 18432 KB

cache_swap_low 95
cache_swap_high 97

access_log /usr/local/squid/var/logs/access.log squid
cache_store_log none
logfile_rotate 7


2 36GB scsi disks are mounted on /sda1 and /sdb1 as

/dev/sda1 on /sda1 type reiserfs (rw,noatime,notail)
/dev/sdb1 on /sdb1 type reiserfs (rw,noatime,notail)

I can see lots of entries in cache.log that looks like:

2008/01/18 09:24:18| storeLocateVary: Not our vary marker object, 1B384B5F6E91A0FE402D4DA6F9B067B0 = 'http://x.tagstat.com/js/announcements.js', 'accept-encoding="gzip,%20deflate"'/'gzip, deflate'

Any suggestions please..

Thanks
Manoj
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