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

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3
votes
2answers
4k views

Squid refresh_pattern won't cache “Expires: …”

Background I frequent the OpenGL ES documentation site at http://www.khronos.org/opengles/sdk/1.1/docs/man/. Even though the content is completely static, it seems to force a reload on every single ...
9
votes
1answer
2k views

Managing battery relearn cycles on LSI and similar RAID controllers

How do engineers deal with RAID controller battery "relearn" cycles? As noted in: What's a "battery relearn" on a LSI MegaRaid?, relearn cycle discharges the RAID controller battery ...
0
votes
0answers
7 views

Can I use multiple caching layers in NGINX? [on hold]

I am planning to use NGINX as a reverse-proxy for SSL Termination, PageSpeed, Output Caching, etc... Specifically regarding caching, I'd ideally like to have two layers of caching. A redis cache ...
0
votes
1answer
1k views

Nginx proxy cache (proxy_pass $request_uri;)

I need to create proxy web using nginx. If I access http://myweb.com/http://www.target.com/ the proxy_pass should be http://www.target.com/ Here is my configuration: location / { proxy_pass ...
0
votes
0answers
14 views

Disable file content/data cache for NFS?

I'm using NFS to share a directory between host (nfs-serer) and guest (nfs-client) system. I did not want to use KVM's preferred module 9p due to slow transfer speeds - NFS, does yield about twenty ...
1
vote
2answers
110 views

In a vanilla Ubuntu LAMP + virtualmin server, how do i allow cache?

I recently set up an Ubuntu 12.04 server with the default LAMP task. Also added virtualmin. All requests to apache return this in the headers. Cache-Control:no-store, no-cache, must-revalidate, ...
2
votes
1answer
172 views

Stunnel + Varnish + Apache questions

I am currently running Varnish in front of apache for all http traffic. I added stunnel so as to take advantage of the cache for HTTPS connections as well. So, for HTTPS, stunnel talks to varnish ...
-1
votes
1answer
17 views

Due to online cache can't see website [on hold]

Have uploaded a site after shifting the domain to new server. royaledecasa.com hosted on Windows. server is shifted today around 11am still niether site or mails are working. On mobile can see the ...
0
votes
1answer
291 views

nginx wont cache images when they are read through php files

I have .php file which is loading images to hide their location. Every images are correctly caching through this directive: location ^~ \.(jpg|jpeg|png|gif|ico|css|js)$ { expires max; ...
0
votes
1answer
25 views

mod_expires does not affect caching

I have mod_expires installed in Apache on CentOS VPS. It is also listed in the loaded modules, I checked by this command /usr/local/apache/bin/httpd -l When I place the code in .htaccess, and then ...
1
vote
1answer
2k views

VCL - configuration for Magento and Varnish 3.0.2

I would like to kindly ask if there's someone who can help me configure Varnish for Magento to reach far more hits. My current ratio from varnishstat is: cache_hit=271 cache_miss=926 I'm kindly ...
3
votes
1answer
3k views

ASP.NET cache trimming aware of app pool memory limit?

I’m running a ASP.NET application on Win2003 32bit that tends to allocate a lot of memory. To avoid OutOfMemoryExceptions that start to appear when the W3P process exceeds 1 GB, I have set a maximum ...
0
votes
1answer
33 views

Linux ZFS does not buffer writes to write buffer (SLOG/ZIL)?

When experiencing write I/O, the log column in zpool iostat -v does not show any ZIL activity, ever. This results in higher than expected wait times when writing data to disk (sometimes over 80ms ...
2
votes
0answers
212 views

How to enable disk cache again after enabling iSCSI in Windows Server 2012?

I create an iSCSI Virtual Disk and a corresponding target. This enables the cache bypass flag on the volume. After I remove the iSCSI disk, the flag doesn't get reset. Anyone can help me to reset ...
1
vote
2answers
1k views

Unusual Caching Issue with IE 7/8 and IIS 7

We recently moved a site into production running Server 2008 x64 and IIS 7. The ASP.NET pages apparently load just fine, but when it comes to IE 7 and 8, a weird caching issue has cropped up with the ...
0
votes
1answer
1k 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
1answer
2k views

setting Expires date in iis6

i try to control my iis6 caching i was able to set Cache-Control public, max-age=1000000 but i can't set the Expires any help?
0
votes
1answer
180 views

How to fill up linux cache?

I am well aware on how to drop (e.g. /sbin/sysctl vm.drop_caches=3 ) caches in Linux, but for benchmarking I'd like to do the reverse, fill up the caches up to 100% RAM if possible. How would I do ...
17
votes
3answers
4k views

How effective is LSI CacheCade SSD storage tiering?

LSI offers their CacheCade storage tiering technology, which allows SSD devices to be used as read and write caches to augment traditional RAID arrays. Other vendors have adopted similar ...
2
votes
1answer
805 views

Nginx, memcached and cakephp: memcached module always misses cache

I've got a simple nginx configuration; server{ servername localhost; root /var/www/webroot; location / { set_md5 $memcached_key $uri; index index.php index.html; try_files $uri ...
2
votes
1answer
2k views

Clearing Java certificates cache (force reload certificates)

A simple question here. One application gave me this exception when trying to access a website with a expired certificate: java.security.cert.CertificateExpiredException So, I renewed the ...
0
votes
0answers
12 views

Apache + PHP (fast-cgi) + Wincache on Windows Server crashing

We have one PHP application that runs on Windows Server 2008 Apache 2.2.23 PHP-5.4.27 (FastCGI) Wincache 1.3.4.0 and crashes from time to time and I'm not able to figure out what's going on. ...
-1
votes
0answers
15 views

Windows IP address cached even after cable unplugged? [migrated]

I have a PC which connects to a network by both wired cable and wireless. Of course, it has 2 IP Addresses : 192.168.5.111 and 192.168.5.112. (Subnet mask 255.255.255.0) As usual, the PC picks the ...
0
votes
1answer
33 views

NGiNX Custom Cache param based on regex match

My question(s) are as follows: How do I set custom variables based on regexp against a useragent? How do I set custom headers for the reverse-proxy request? How do I use these values as caching ...
1
vote
1answer
95 views

varnish is caching logged in users pages and serving those pages

I set logged_in cookie when user login. If logged_in cookie exits then varnish will not cache the request. This is my vcl_recv sub vcl_recv { if (req.backend.healthy) { set req.grace = ...
1
vote
3answers
60 views

Would the data on the RAID Card Cache and Drive Cache be lost when a kernel panic happens?

Is a BBU necessary when you have A+B power? Would the data on the RAID Card Cache and Drive Cache be lost when a kernel panic happens and you are forced to do a cold reset?
4
votes
0answers
45 views

Slab usage extremely high?

On a Centos 7 server with 32GB RAM memory I am running a few programs namely MySQL, Apache2, PHP. Recently I wanted to verify the amount of ram left as I was planning on installing a few more ...
3
votes
1answer
3k views

Error headers: ap_headers_output_filter() after putting cache header in htaccess file

Receiving error: [debug] mod_headers.c(663): headers: ap_headers_output_filter() after I included this within the htaccess file: # 6 DAYS <FilesMatch ...
4
votes
1answer
460 views

Growing OS cache in RAM causing high system CPU usage

Long question, so please bare with me: I'm having a weird issue with a server that I've never seen before. On a machine with ~30G of RAM with an application that takes ~10G (spread across hundreds of ...
1
vote
0answers
48 views

Transparent data caching in multi-site environment

I need an advice on choice of the right technology for my problem. I have geographically distributed multi-site environment where there is one main site and a number of remote sites. Main site ...
36
votes
3answers
23k views

Disable caching when serving static files with Nginx (for development)

We are using Nginx to serve static files on a development platform. As it is a development platform, we'd like to disable caching so that each change is propagated to the server. The configuration of ...
1
vote
0answers
16 views

counter for availability of dedicated Azure cache

The following link have a list of Azure caching perf counters : http://msdn.microsoft.com/en-us/library/azure/hh914135.aspx#PerfCountersc2 we are interested in, to get the utilization of the cache ...
0
votes
1answer
423 views

How can I cache android packages using squid Cache?

I have a wireless Access point with another system using debian and squid/dansguardian as a transparent proxy to filter adult content. I can see that 90% the traffic comes from android phones and ...
0
votes
0answers
27 views

website has problems for one person but not for another

My partner and I run 2 websites that I can access fine in all 3 major browsers. He unfortunately can not. He gets "too many redirects" error in Chrome and 404 error in IE but only for the one website. ...
4
votes
2answers
424 views

Strange Recurrent Excessive I/O Wait

I know quite well that I/O wait has been discussed multiple times on this site, but all the other topics seem to cover constant I/O latency, while the I/O problem we need to solve on our server occurs ...
3
votes
2answers
202 views

iozone: 5 concurrent threads random read of 300K blocks does more ops/s than using only one thread, what could be the underlying reason?

The partition is in RAID1 using software RAID. Command line used: iozone -s 190g -r 300k -O -b test_file OPS Mode. Output is in operations per second. ...
0
votes
1answer
38 views

NGINX and Node.js Caching returning the same results on all subfolders

We use NGINX to proxy a connection to a Node.js instance running on the same server. Without caching turned on for that location, at one level (i.e. /v1/streams/) it returns a 2MB json file. If an ...
1
vote
1answer
53 views

Varnish does not purge my requests sent by Plone

I have varnish 3.0.5 up and running, connecting to a Plone 4 backend. My requests are cached, but not purged reliably, actually only after expiration of the ttl. plone.app.caching is the addon, which ...
0
votes
0answers
38 views

NGINX: proxy_cache altering headers

I have been having trouble building a proxy between my server and s3 to cache requests. I finally boiled it down to a single point of failure... http{ proxy_cache_path /home/cache levels=1:2 ...
0
votes
0answers
31 views

Nginx proxy cache invalidating request to s3

I have set up a proxy from my application server to a private s3 bucket to cache requests. I was having some trouble with it where s3 was rejecting my download requests (403 forbidden) and after some ...
0
votes
1answer
159 views

How to set Nginx ignore Pragma: no-cache

I'm setting up a Nginx server for a cache proxy server. I've noticed that cache not working when this header is in request: Pragma: no-cache Without this header, cache working ok. Can I make ...
0
votes
1answer
289 views

Nginx ignore query string for caching certain files

I know my setup is a bit crazy, but whatever.... I set up Nginx on Openshift to cache map tiles (for a map viewer, you can guess the purpose, :-) ) that are served from my home network, which has ...
0
votes
1answer
55 views

Nginx map cache rules does not work

I have created map rules for Nginx for avoid cache. However it does not works nocache_map.conf (included in http section. map $http_x_requested_with $nocache { default 0; ...
0
votes
0answers
64 views

Caching Docker (Cloudfront) images with Squid

I have a Squid server setup with ssl-bump caching SSL resources used by Docker but I'm having issues trying to get it to cache requests to Cloudfront, for example: 1415056176.733 190419 172.17.0.40 ...
0
votes
0answers
32 views

First steps in distributed cache and application

Background: We provide a client with a single server to which we provide a data dashboard site (ASP.NET/IIS7) feeding multiple MSSQL databases (OS: Windows Server 2012 / SQL: MSSQL 2008R2). One of the ...
0
votes
1answer
139 views

Nginx not processing proxy hide header and proxy ignore headers

I have trouble trying to make Nginx ignore and hide some headers from a proxied server. I want Nginx to hide and ignore "Cache Control" and "Server" headers but it didn't work, I don't know why. My ...
-1
votes
3answers
449 views

How to flush DNS resolver cache on Linux (and FreeBSD)

I am admin for several Linux and FreeBSD servers and here is a problem I have: The servers run a tool that does a lot of DNS queries every minute for the entire network. When it does a query, the ...
2
votes
2answers
62 views

Solaris 10 ZFS ARC Maxed Out and CPU's Overloaded

We've been running ZFS for a couple years now on Solaris 10 on Oracle M5000 Enterprise server with 32 CPU cores and 256GB of memory. We are running a database/application on this server which appears ...
-1
votes
1answer
50 views

Varnish with PHP FastCGI / Change FastCGI server port

I want to run Magento with Varnish Cache. So far my PHP runs as FastCGI. I am now trying to set up Varnish. And have a probably pretty stupid question. So as I understand Varnish will listen on port ...
0
votes
1answer
79 views

djbdns/dbndns dnscache query ipv6-only nameservers?

I have (attempted to) set up dnscache on Ubuntu 14.04 (Trusty) to do dual stack for servicing requests AND querying authoritative name servers. To be clear, I'm using the dbndns package, which has ...