A location or process for storing of transitory or temporary data in order to improve application or system performance.

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2answers
867 views

How can I get Nginx to tell Firefox to cache my content?

The following headers (from a static media response) don't lead to caching in Firefox. In Chrome they do. HTTP/1.1 200 OK Server: nginx Date: Sat, 22 Dec 2012 21:20:39 GMT Content-Type: ...
2
votes
2answers
911 views

nginx: Specify custom headers in rewritten location blocks

I'm trying to set some headers only for specific location blocks in nginx. The problem I have is that those location blocks contain rewrite statements, which apparently seem to drop the custom ...
3
votes
1answer
121 views

Increasing the maximum DNS record size on a Cisco 800 Router

Is it possible to increase the maximum record size/cache size supported by the DNS server embedded in a Cisco 800 series router (886VA in my case)? I cannot query large (1500b) TXT records without ...
2
votes
3answers
144 views

Will a raid cache be better for performance than hard drive cache speeds?

In a device that has raid 5, and a "raid cache" of 4GB, does this help performance? I have 32MB cache hard drives but I was wanting to know if the 4GB cache will make up for the difference in ...
0
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1answer
224 views

Stop Windows Domain Environment Caching Old Passwords?

I have noticed on my domain environment; the old Administrator password (before password expire).. The client machines have cached the old password and have the ability to bypass the new password by ...
0
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1answer
554 views

Cache Control Headers with IIS 7.5

I'm trying to wrap my head around client side (web browser) caching and how it works in relation to IIS 7.5 cache control headers. In particular: If we want to force clients to reload cached ...
0
votes
2answers
212 views

Caching without file extensions

I'm trying to use Varnish to show the non-logged in users a cached version of my website. I'm able to perfectly detect if the user is logged in or out, but I can't cache pages without extensions. ...
1
vote
1answer
203 views

How to instruct linux not to swap out hot pages of mmaped files?

I have a server where I run worker processes that mmap serveral rather big read-only "dictionary" files (~8GB total). Tests showed that they actively access only around ~1GB worth of the pages in ...
0
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1answer
206 views

Caching all files in varnish

I want my varnish servers to cache all files. At backend there is lighttpd hosting only static files, and there is an md5 in the url in case of file change, ex. ...
1
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0answers
134 views

Data Cache (XCache, APC, memcached, etc) on shared hosting / privacy considerations

I have one question. How appropriate is to use on shared hosting a cache system for data? I mean as far as I know the data is written in a shared data cache (not private for each user) across all ...
3
votes
3answers
1k views

What is the memory module on a RAID card needed for?

As above, what is the reason for needing a memory module on a RAID card? The card I am looking at (HP P410) comes with either 256MB or 512MB but unsure which to get and why.
1
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1answer
182 views

Apache gettext - cache persisting after restart

Running apache2 through Plesk. When I update the .mo files via subversion, and then restart apache (either through commandline or through Plesk interface), the translations do not update. Modified ...
1
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0answers
68 views

.htaccess recommendations to prepare for new launch of website - caching

Currently my website has cache controls set for javascript libraries and images, and caches them for one week. I'd like to know what best practices I should following leading up to my websites ...
0
votes
2answers
1k views

Why is IIS 7.5 flushing file cache very often?

We're running a Win 2008 R2 server with IIS 7.5 for serving image files. It's only used for static content, and file caching has been set up to cache files for 10 minutes. However the IIS frequently ...
0
votes
0answers
453 views

AppFabric ErrorCode<ERRCA0017>:SubStatus<ES0002>

I am experiencing an issue in production that I cannot replicate in development or QA environments. Occasionally (three times in the past couple months), I will get a rash of errors from AppFabric. ...
-1
votes
3answers
96 views

Weird network behavior, Webserver is stopped but still can reach the file [closed]

I downloaded the file dl.example.com/10mg.test once. And suddenly I noticed even without webserver running (service nginx stop) I can still reach the file. How is this even possible ? No matter how ...
0
votes
1answer
259 views

Squid reverse proxy array - siblings not communicating with each other

I want to set up 2 squid servers to act as reverse proxy and cache for a webserver on our intranet. The load balancing will be done with DNS round robin or just different mappings for different ...
0
votes
1answer
154 views

how to manage when squid server crash and internet share for all when bypass server by WCCP Cisco router accrued?

We have about 735 clients with windows 98 SE and Windows XP (joined to domain) Windows 7 and 8 and etc. and have about 35 servers and internet connections and cache servers that one of them is Squid ...
0
votes
1answer
136 views

ngnix and avoiding thundering herd scenario

I have a setup where nginx would try_files on the nedia direcotry and serve a static image file. If it does not find it, will call the backend, pull the file from s3, create some DB entries and then ...
0
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4answers
223 views

Fast small static file serving on a VPS - avoiding the Disk

I need to serve a large number of very small static files (e.g. 1Million, ~1KB), from a VPS. My current favoured approach is Nginx, but my main concern is hitting slow VPS disks. Is there an ...
2
votes
3answers
819 views

nginx not returning 304 on cached content

I'm using nginx as a reverse proxy with an Apache back-end handling some PHP files. The files return the right expiry headers and proxy_cache does a good job of caching them, but I've noticed that ...
1
vote
1answer
234 views

How to view dirty page count in Windows Server 2003

Is there a way to view the number of dirty pages (cached file pages that need to still be written to disk) in Windows Server 2003? In Windows 7, for example, I can use Performance Monitor and use the ...
1
vote
1answer
2k views

PHP-APC is exceeding limit apc.shm_size often

I am implementing the apc on a shared server that currently has 1000 sites (using wordpress, moodle, etc.). I'm Looking for the admin page, and I see "Cache full count" is growing rapidly. I've tried ...
0
votes
1answer
198 views

503 error Varnish cache when eAccelerator is started

I have a Magento installation running on x-large Amazon server. I have Varnish, memcached and eAccelerator installed on the server. At first everything was working fine, but then at some point it ...
3
votes
1answer
135 views

Can Varnish/Nginx cache and store PHP pages after user visited?

Please assume that there is a PHP CMS that retrieves content according to IDs from database. So every time you visit this website it interacts with Database and Processes the PHP request. Can Nginx ...
0
votes
1answer
141 views

A web server or caching proxy to cache php completely as html?

My Server's load and mysql usage are higher than usual and recently I see about 350 processes for each HTTPd and mysqld. Is there a web server or caching proxy to cache PHP as HTML?
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0answers
296 views

Varnish cached 'MISS status' object?

My site uses nginx, varnish, jboss. And some url will be cached by varnish, it depends a response header from jboss. The first time, jboss tells varnish doesn't cache this url. Then the second ...
2
votes
1answer
2k views

Open table cache in MySQL

I have my open table cache set to 1800 and I have a total of 1112 tables. MySQL Tuning Primer reports that 100% of my table cache is used yet my table cache hit rate is 5%. I understand that this ...
0
votes
0answers
145 views

APC 99% Misses on Filecache

I have installed APC Cache in an Ubuntu + Zend Server enviroment. But it seems the APC does not Cache any File or does not use the cached files. After some Requests: File Cache: Cached Files 419 ...
1
vote
1answer
644 views

Nginx location to match query parameters

Is it possible in nginx to have a location {} block that matches query parameters. For example I want to pick up that "preview=true" in this url and then instruct it to do several different things, ...
2
votes
2answers
5k views

Why is Varnish not caching?

I am troubleshooting the setup of Varnish 3.x on my Ubuntu server. I'm running Drupal 7 on two sites set up on the box, via named-based vhosts. Before trying to get Varnish to play nice with Drupal ...
1
vote
2answers
467 views

Http header 304 and caching?

Our company uses these settings( don't ask me why) - for every request they want a new request from server. this is an intranet system which uses only IE. They defined it in : We also have ...
1
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1answer
161 views

Can squid cache objects from HTTPS sites?

We have squid 3 installed at our Linux gateway server. We have enabled caching. Can it cache objects from https sites ?
0
votes
3answers
586 views

how to set up a cache proxy server for itunes app store

I want to setup a cache proxy server for apple itunes store to accelerate app downloading in a local lan. Situation: Local internet speed is slow and bandwidth is limited, so it'll take sometime to ...
0
votes
2answers
1k views

Flush mod_pagespeed cache in Debian

I need a way to flush the mod_pagespeed cache while developing. According to mod_pagespeed documents, I should run the following command: sudo touch /var/mod_pagespeed/cache/cache.flush In Debian ...
1
vote
1answer
577 views

Nginx cache reverse proxy: how to keep app server alive during the 5 second window when cache expires?

I have an nginx server sitting in front of apache running django. Most of my site is static content: http://www.grovemade.com/ My app server can handle the pieces that needs to be dynamic just fine ...
3
votes
0answers
44 views

How can I measure disk cache churn on Linux? [duplicate]

Possible Duplicate: Is there a way to get Cache Hit/Miss ratios for block devices in Linux? I have a file server which serves out large (25GB-1TB+) files over the network from local ...
0
votes
1answer
587 views

Is it advisable to put eAccelerator cache dir to RAM?

I've just installed eaccelerator on server that's gonna be running Magento. I have a hard disk, so was wondering would my server performance improve if I was to mount eaccelerator cache dir to RAM. ...
2
votes
1answer
1k views

Optimising busy website with Varnish and lots of ram

[Updated to be much more consise!] I'm new to the world of optimising web servers for lots of traffic, but that's now something I'm getting into. On Monday our webserver was 'slashdotted' - we got a ...
11
votes
1answer
6k views

For L2ARC and ZIL: is it better to have one large SSD for both, or two smaller SSDs?

Main references ZFS L2ARC (Brendan Gregg) (2008-07-22) and ZFS and the Hybrid Storage Concept (Anatol Studler's Blog) (2008-11-11) include the following diagram: Question Should I interpret the ...
-1
votes
1answer
393 views

How to arrange web servers with Varnish? [closed]

I am wondering what it the best (most stable with the least memory footprint) arrangment for a busy php+mysql app? request > Varnish > Apache requests > Varnish > Nginx > php5-fpm ...
2
votes
2answers
290 views

Varnish micro-caching

Micro-caching and Nginx can really speed up the app. Would it be possible to use micro-caching (or something similar) with Varnish?
1
vote
1answer
338 views

which caching system to work with mpm_worker and mod_fcgid?

I was planning to use APC for my Apache Server based on mpm_worker and mod_fcgid but I found out that APC and also xCache doesn't work with mod_fcgid. so what do you suggest?
1
vote
3answers
176 views

Is it safe to use up all memory on linux server, not leaving anything for the cache?

I have a CentOS server fully dedicated to MySQL 5.5 (with innodb tables mostly). Server has 32 GB RAM, SSD disks, and avarage memory usage looks like this: So about 25GB is in use and about 6.5GB ...
2
votes
1answer
340 views

Nginx Subdomain Wordpress Rewrite Rules - APC FPC - Slow as a turtle. why?

Running on Ubunty 10.04 Nginx (one of latest) with Wordpress subdomain multisite using the plugin. APC i have latest version same with php, I am running 4 websites with almost no traffic (30 hits ...
0
votes
1answer
334 views

Make nginx avoid cache if response contains Vary Accept-Language

The cache module of nginx version 1.1.19 does not take the Vary header into account. This means that nginx will serve the same request even if the content of one of the fields specified in the Vary ...
1
vote
1answer
388 views

Configuring varnish and django (apache/modwsgi)

I am trying to work out why my application keeps hitting the database while I have setup varnish infront of apache. I think I am missing some vital configuration, any tips are welcome This is my curl ...
0
votes
3answers
4k views

HP p410i array controller - what happens if i add memory?

I have a p410i array controller that only has 256ram. We want to create a raid 5 so we have procured a 512 write back cache module. If we install the write back cache, will this erase the ...
0
votes
1answer
4k views

How to flush cache for IIS 7.5 on Windows Server 2008 R2?

Hope someone can help me with this. I have PHP successfully installed via Fast-CGI for IIS 7.5 on WS2008 R2. Let's say i try to edit some file called about.php and save it. If i check the changes ...
1
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0answers
253 views

How to disable Nginx web pages caching to avoid ISP cache?

My problem is simple. I did some changes on a homepage this morning (add some sentence) and it did not appear in my browser. I cleared symfony cache, nginx cache, apc cache, restart apache, restart ...