Welcome! Log In Create A New Profile

Advanced

Re: Odd cache behavior

All files from this thread

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 10:02AM
Igor Sysoev wrote:
> 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 ?

This is correct.

> Could you monitor inode usage also ?

See attached graphs.

> Did you restart nginx in the times of the drops or not ?

No.

> Currently I have no idea why it may be.
>
>


--
Jim Ohlstein
Attachments:
open | download - localhost-df_inode-day.png (16.3 KB)
open | download - localhost-df_inode-month.png (19.6 KB)
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



Sorry, only registered users may post in this forum.

Click here to login

Online Users

Guests: 186
Record Number of Users: 8 on April 13, 2023
Record Number of Guests: 500 on July 15, 2024
Powered by nginx      Powered by FreeBSD      PHP Powered      Powered by MariaDB      ipv6 ready