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

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4
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0answers
1k views

LSA SID cache keeps old entry for renamed domain user - why?

I have a question about LSA SID cache on a domain member server. Recently I run into the issue when some users after their name was changed in AD has difficulties accessing application I support, and ...
4
votes
0answers
359 views

How do I clear cached SSL state data from schannel?

I'm trying to clear SSL state data for a normal TLS session (no client certs are involved) for Outlook when connecting to a SSL based CAS server. How do I clear the SSL state of SChannel? Does the ...
3
votes
0answers
223 views

Varnish cache objects expiring while in stale-while-revalidate grace period

I have added Varnish 4.0 to a CentOS 6 server running cPanel to cache a website I have developed. I am trying to implement stale-while-revalidate to ensure that all users are served a cached version ...
3
votes
0answers
382 views

start nginx despite missing upstream

I like to run nginx as a local proxy server, serving stale cache files if the upstream server is unavailable. This works well, except the local machine is restarted, while the internet connection ...
3
votes
0answers
1k views

Nginx cache shared between multiple servers

We have 8 REST-ish API servers with Nginx using FastCGI with PHP-FPM to handle requests. We're currently using Nginx' FastCGI caching (directives like fastcgi_cache_path). This means that API ...
3
votes
0answers
1k views

IIS caches things, even when I disable output caching

I have an IIS web server on my local network for development purposes, and I want to disable all caching mechanisms. IIS seems to be caching everything, even when I disable output caching like so: ...
3
votes
0answers
388 views

How can I optimize the Windows file cache so flushing a file is faster?

I have a third-party, object-oriented database server running on a Windows Server 2003 x64 machine with 24 GB of RAM. Except for some system processes and monitoring tools, the database server is the ...
2
votes
0answers
27 views

Protect cached content in apache

I'm facing an issue where I have some cached contents in a disk and I want to protect it with a token url. I can protect my files via htaccess, once they are not cached (direct access), but now I ...
2
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0answers
129 views

Is this an nginx proxy_cache bug?

I have a very simple proxy config: http { proxy_cache_path /var/www/cache levels=1:2 keys_zone=s3-images-cache:50m inactive=1M max_size=1000m; proxy_temp_path /var/www/cache/tmp; server {...
2
votes
0answers
71 views

lvm PV on top of dm-cache

I am running a private cloud (opennebula, KVM) where I am running VMs both directly using LVM Logical Volumes and using disk images on a file system (one is faster, the other is easier to migrate), ...
2
votes
0answers
627 views

Problems on mounted NFS: 'No such file or directory' but files and directories exist

So we are having a medium-sized NFS4 storage server running CentOS 6.6 exporting an NFS share /storageDat (which is the NFS root, with two RAID volumes bound in there: ./dat1 and ./dat2); Export ...
2
votes
0answers
1k views

Is it really possible to use PHP sessions for authentication with nginx fastcgi cache?

I have recently switched an opencart instance from Apache+mod_php to nginx+fastcgi+php-fpm. I have been trying to leverage caching for most pages through fastcgi-cache. Unfortunately, many users ...
2
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0answers
417 views

400 bad request from a proxy cache

So we have an nginx proxy cache that is used to maintain uptime even if npm goes down. On occasion this server (noticeably once every few months) starts returning 400 bad request for every response ...
2
votes
0answers
71 views

Do we get a access.log entry for content served from cache in nginx

For a configuration that looks like http { proxy_cache_path /etc/nginx/cache keys_zone=one:10m; access_log /var/log/nginx/access.log; error_log /var/log/nginx/error.log; server { ...
2
votes
0answers
757 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 ...
2
votes
0answers
492 views

NFS showing files in directory, but can't open or stat

I'm using a network of Linux (Debian Squeeze on kernel 2.6.32) machines, sharing files using NFS (v3). The scenario is that a process running on client A will create a file through NFS on file server ...
2
votes
0answers
243 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 ...
2
votes
0answers
121 views

Why does this one file not respect .htaccess' cache-control header?

Testing performance improvements, I added an .htaccess file with the following directives to my /assets folder (where I store a few images of various types). <FilesMatch "\.(jpg|jpeg|png|gif)$">...
2
votes
0answers
1k views

Best opcode cache for fcgid? (APC vs eaccelerator vs xcache)

I have been reading a while the web trying to find out about opcode caches for fcgid. As I understand so far APC is not a good solution for fcgid, since APC with fcgid caches only per process and that ...
2
votes
0answers
339 views

How to make background flushing more aggressive

I've got a system that is doing a continuous steady stream of writes to GFS2 filesystems, and what happens is that the cache builds up to vm.dirty_ratio and then load skyrockets during a synchronous ...
2
votes
0answers
774 views

How can I exceed the 60% Memory Limit of IIS7

Pardon if this is more stackoverflow vs. serverfault. It seems to be on the border. We have an application that caches a large amount of product data for an e-commerce application using ASP.NET ...
1
vote
0answers
17 views

On multiple request to Squid, send a single request to a backend and queue other requests on miss

I would like to protect a backend server by having Squid send a single request to a the server when there is a cache miss for a resource. During the fetching, other requests should be put on hold ...
1
vote
0answers
14 views

BIND cache dump file format parsing

I'm trying to analyze the contents of BIND's cache by looking into dump files, the ones generated by rndc dumpdb -cachedb. ; ; Start view _default ; ; ; Cache dump of view '_default' (cache _default) ...
1
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0answers
85 views

nginx x-cache status flipping between hit and expired on WordPress site (test php file OK)

I have an nginx cache setup for a WordPress site, and it is flipping between nginx header status x-cache: HIT and x-cache: EXPIRED seemingly randomly: C:\Users\curl-7.48>curl -I http://example.com ...
1
vote
0answers
109 views

Squid takes a long time to get a response for HTTP requests, never hit neighbor cache

I am trying to install Squid in a sibling model by following these instructions. But when the client executes HTTP request it takes a long time to get response from the server. System model: +-------...
1
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0answers
40 views

Why ZFS ARC hit rate is higher than real performance hit?

We've got Debian Wheezy host with ZFS on Linux with in. It is used only for serving large files over http. User activity is mostly characterized by a lot of random read. We've noticed that ~95% ARC ...
1
vote
0answers
67 views

Nginx setting fastcgi_cache_valid

I have been trying to set 2 different cache times. I need a microcache for single request. And all other requests should be cached for longer time. All requests must go to location block, so that ...
1
vote
0answers
121 views

Which are possible hierarchies for bcache, mdadm RAID and LVM?

Assuming I want to use bcache for caching, mdadm for RAID (1) and LVM for partitioning (and that I don't care that there might be performance drawbacks due to many levels of I/O and device management ...
1
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0answers
41 views

CloudFlare not caching vBulletin php page serving image content

I have signed up with CloudFlare and while it seems to work for some pages I cannot get a rule to work correctly with php pages serving images. The page in question is: http://www.landcruiserclub.net/...
1
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0answers
46 views

Squid reverse proxy not able to cache

Not able to cache anything with squid reverse proxy, running in centOS6.5 squid.conf http_port 81 accel defaultsite=example.com:8080 no-vhost cache_peer example.com.ip.address parent 8080 0 no-...
1
vote
0answers
29 views

ESX 6 arp fails in back 2 back link

we are having a strange problem with back 2 back connection between an ESX 6 and CentOS 7 machine. Hoping to find a solution on stackoverflow The story is below: - we are using a CentOS 7 directly ...
1
vote
0answers
31 views

nginx proxy cache configuration for user authentication web application

I have a web application in node + express + passport + mongo database + ejs and single application is configured to handle all the sub-domains. I'm using nginx as proxy server, I need to and must use ...
1
vote
0answers
70 views

How to increase the amount of memory used for caching on 32 bit Linux?

I have a server with 64 GiB RAM running 32 bit Debian GNU/Linux v7.9: # uname -a Linux srv1 3.2.0-4-686-pae #1 SMP Debian 3.2.68-1+deb7u5 i686 GNU/Linux # free -m total used ...
1
vote
0answers
75 views

Cache dynamic images with nginx x-Accel

We are trying to cache the request to images on our nginx servers. Even though the images are dynamic, the same image is requested frequently in a short time-span. Currently we are trying to solve ...
1
vote
0answers
21 views

Make Varnish check for html static before serving

I was thinking of writing some logics to my application so that it can write the static page content to s3 or some CDN and serve primarily from there. But am not sure if this is possible. For ...
1
vote
0answers
175 views

Symfony No Access to Cache - Red Hat 7

I'm running amazon EC2 VPC, normaly use Centos and I have no problem with it, but I have tried Red Hat Enterprise Linux Server release 7.1, and I have installed everything from scratch. I'm using ...
1
vote
0answers
34 views

dmcache - is removing cache device without suspending safe?

I'm using plain dmcache for SSD cache - unmount procedure goes this way: umount fs suspend cache device remove cache device close lvm close LUKS shutdown However sometimes dmsetup doesn't allow me ...
1
vote
0answers
81 views

slabtop command doesn't work

I've inherited Sys Admin duties on webserver and I'm a bit of out my element, but learning as I go. My newest issue is all the of the ram has been gobbled up and I'm not sure where it has gone. free -...
1
vote
0answers
51 views

WordPress Nginx Browser Cache Expires on Extentionless URLs

Struggling a bit with the following. Adding expires for JS and CSS, plus other static files is easy: # Directives to send expires headers. location ~* \.(?:css|js)$ { expires 28d; ...
1
vote
0answers
201 views

Poor SSD I/O performance with rTorrent and Debian

I'm using a Dell PowerEdge R210 II server with Intel Xeon E3-1230, 32GB RAM DDR3, 2 x 480 GB SSDs SATA3, 2 x 1 Gbit network connection. I'm using both network connections at the same time (802.3ad ...
1
vote
0answers
849 views

Protocol not available errors in squid3

I set up a transparent cache proxy on my Raspberry Pi with Squid3. Everything seems to be working fine and Squid is caching everything it's supposed to and working perfectly. The cache.log is filled ...
1
vote
0answers
138 views

Keep file system meta data in cache with vfs_cache_pressure

My Ubuntu Linux (virtual) servers run rdiff-backup daily, which looks at all file meta data to determine what needs to be backed up, slowing it down. It does this every day, even though most files don'...
1
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0answers
134 views

Nginx proxy_cache / Varnish - parallel requests trigger multiple requests to backend?

I am looking for a HTTP reverse proxy that will handle HTTP live streaming use cases in a performant manner. Assume file/fragment sizes up to 4MB with a constant load of client requests for the same ...
1
vote
0answers
323 views

How to force a refresh of cached permissions without a restart

We've recently started going through shares replacing named permissions with AD groups (i.e. so that when updating permissions we don't need to worry about the time taken or risks involved in updating ...
1
vote
0answers
162 views

Rewrite a url to a a new URL and then send the new URL to a PHP script

I have URLs that contain a cache busting string. I want to rewrite these URLs without the cache busting string, and then send the rewritten URLs that match a certain criteria (e.g. audio/video files) ...
1
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0answers
84 views

NVA: rewrite before or after Varnish?

I'm planning an NVA server system (Nginx-Varnish-Apache), where request are routed through in that order. Apache would be serving WordPress CMS or similar. I'm wondering where to apply additional ...
1
vote
0answers
22 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 ...
1
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0answers
148 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 ...
1
vote
0answers
350 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 ...
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0answers
188 views

How cache OpenLDAP Meta database (for use with Websphere Application Server)?

I have configured Meta database directory on OpenLDAP server for two different Active Diretories and it's work. But now I'd like set cache for this OpenLDAP, but I don't know how. From my slapd.conf ...