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proxy_cache calculating size error under SSD drive but not SATA drive

July 18, 2013 07:46AM
Hello:

I think I am on the right way, but not sure...

The scenario:

- Have 2 drives:
-> SSD drive - XFS - default options (with noatime, discard) - almost empty
-> SATA drive - XFS - default options - almost empty

- Kernel variables, shared memory, ulimits, max-file, etc... all correctly configured

- Nginx and virtualhost correctly configured.

- proxy_cache_path <PATH> levels=1:2 keys_zone=catalogo_fotos:2500m max_size=2500m inactive=120d;


Ok.. here I am... it depends of the path... the problem is:

- If the path is at SATA drive -> cache is growing until maximum 2500m are reached... no problem here. Normal..
- If the path is at SSD drive -> cache is not growing until limit... it stale... problem... why?

If debug see:

2013/07/18 13:15:52 [debug] 17641#0: http file cache size: 640039
2013/07/18 13:15:52 [debug] 17641#0: http file cache forced expire
2013/07/18 13:15:52 [debug] 17641#0: http file cache forced expire: #0 1 933590ab
2013/07/18 13:15:52 [debug] 17641#0: http file cache expire: "/DATA/cache/catalogo_fotos/7/3a/c1de7a39f5393c24933590ab20ba43a7"

while:

root@megaserver1 /DATA/cache # du -hs catalogomodacom_fotos/
1.8G catalogo_fotos/
root@megaserver1 /DATA/cache # find ./catalogo_fotos/ -type f | wc -l
17134

What happens?

Every 10 seconds, http file cache size detects max size and starts to force expire and delete cached files...

What is that "http file cache size: 640039" ???? That number, which way is calculated??? What it is?

I have enough shared memory, already properly configured (1Gb for each app and 14Gb total).... and the question is if I change path and set it under SATA drive there is no problem.

I am thinking at all at this "http file cache size: 640039"..... I think it is the key about what is happening... that number is not near the max size of 2500m defined for the cache deposit, and is not near the number of files actually at cache, around 17134...

Could you help me please?

Thanks so much in advance.

Gino.
SubjectAuthorPosted

proxy_cache calculating size error under SSD drive but not SATA drive

feanorkndJuly 18, 2013 07:46AM

Re: proxy_cache calculating size error under SSD drive but not SATA drive

feanorkndJuly 18, 2013 08:32AM

Re: proxy_cache calculating size error under SSD drive but not SATA drive

Maxim DouninJuly 18, 2013 10:44AM

Re: proxy_cache calculating size error under SSD drive but not SATA drive

feanorkndJuly 18, 2013 08:54PM

Re: proxy_cache calculating size error under SSD drive but not SATA drive

Maxim DouninJuly 19, 2013 06:06AM



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