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Re: Odd cache behavior

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File Name File Size   Posted by Date  
localhost-df-day.png 16.5 KB open | download Jim Ohlstein 10/02/2009 Read message
localhost-df-month.png 20.1 KB open | download Jim Ohlstein 10/02/2009 Read message
localhost-df_inode-day.png 16.3 KB open | download Jim Ohlstein 10/03/2009 Read message
localhost-df_inode-month.png 19.6 KB open | download Jim Ohlstein 10/03/2009 Read message
October 03, 2009 05:28AM
On Fri, Oct 02, 2009 at 01:07:24PM -0400, Jim Ohlstein wrote:

> Hello,
>
> I'm seeing odd disk usage statistics for my cache. The cache is
> primarily of small files (images, javascript, and css) and sits on a
> 128GB SSD using ext2 file system mounted with "noatime" option. The
> cache is all that the the drive is being used for at this time.
>
> The attached graphs were generated by Munin using df. The data from du
> correlates closely with df when run manually.
>
> As you can see, periodically, with no set interval, disk usage rises
> gradually, and then drops precipitously. I don't see anything out of the
> ordinary in the error log. The cache serves about 2.8-3 million requests
> per day, up from ~2.2-2.4 million one month ago.
>
> The cache config is:
>
> fastcgi_cache_path /falcon/cache levels=1:2 keys_zone=one:1024m
> inactive=1d max_size=80g;
>
> where the SSD is mounted as /falcon.

As I understand /falcon is used solely for nginx cache ?
Could you monitor inode usage also ?
Did you restart nginx in the times of the drops or not ?
Currently I have no idea why it may be.


--
Igor Sysoev
http://sysoev.ru/en/
Subject Author Posted

Odd cache behavior Attachments

Jim Ohlstein October 02, 2009 01:14PM

Re: Odd cache behavior

Igor Sysoev October 03, 2009 05:28AM

Re: Odd cache behavior Attachments

Jim Ohlstein October 03, 2009 10:02AM

Re: Odd cache behavior

Igor Sysoev October 06, 2009 07:56AM

Re: Odd cache behavior

Igor Sysoev October 06, 2009 08:04AM

Re: Odd cache behavior

Igor Sysoev October 06, 2009 09:00AM

Re: Odd cache behavior

Jim Ohlstein October 06, 2009 09:52AM



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