Varnish 2.0.6 nuking all my objects?

David Birdsong david.birdsong at
Thu Feb 25 19:47:30 CET 2010

On Thu, Feb 25, 2010 at 8:41 AM, Barry Abrahamson <barry at> wrote:
> On Feb 25, 2010, at 2:26 AM, David Birdsong wrote:
>> I have seen this happen.
>> I have a similar hardware setup, though I changed the multi-ssd raid
>> into 3 separate cache file arguments.
> Did you try RAID and switch to the separate cache files because performance was better?
seemingly so.

for some reason enabling block_dump showed that kswapd was always
writing to those devices despite their not being any swap space on

i searched around fruitlessly to try to understand the overhead of
software raid to explain this, but once i discovered varnish could
take on multiple cache files, i saw no reason for the software raid
and just abandoned it.

>> We had roughly 240GB storage space total, after about 2-3 weeks and
>> sm_bfree reached ~20GB. lru_nuked started incrementing, sm_bfree
>> climbed to ~60GB, but lru_nuking never stopped.
> How did you fix it?
i haven't yet.

i'm changing up how i cache content, such that lru_nuking can be
better tolerated.

> --
> Barry Abrahamson | Systems Wrangler | Automattic
> Blog:

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