If it’s high availability you need, then Windows/SQL Server Clustering or SQL Server Database Mirroring offer solutions. Clustering does require a lot of planning and familiarisation if you’ve never done it before, but it will be transparent to the application. Load balancing is possible with SQL Server, but it’s not for the faint hearted. It’s … Read more
from my understanding the stipe_cache_size is the number of stripe entries in the stripe cache. The stripe entries varies from systems to system but it is mostly controlled by the page size(default of 4096 bytes on linux systems)(https://github.com/torvalds/linux/blob/master/drivers/md/raid5.c#L73 , this file have all the logic of the stripe cache if you’d like to dig deeper) … Read more
By the look at the variables you’ve set, it seems like you are mostly concerned with write performance and do not care about possible data losses due to power outages. You only will ever get the option for lazy writes and the use of a writeback cache with asynchronous write operations. Synchronous write operations require … Read more
You have few errors: Should be <Resources> (plural) FileResourceSet could be defined in <Resources><PreResource> section if needed and etc… not well documented yet: The Context Container This works fine for me with Tomcat 8.0.15 & Liferay Portal 6.2.1 GA2 (which has a lot of static files + JDBC pool): <?xml version=’1.0′ encoding=’utf-8′?> <Context> <WatchedResource>WEB-INF/web.xml</WatchedResource> <WatchedResource>${catalina.base}/conf/web.xml</WatchedResource> … Read more
On a general note, the simplest way to deal with issues like this is referring to the manual. http://httpd.apache.org/docs/1.3/mod/mod_expires.html#expiresactive Syntax: ExpiresActive On|Off Context: server config, virtual host, directory, .htaccess Override: Indexes Status: Extension Module: mod_expires The two fields of interest it Context and Override. As we can see its OK to use ExpiresActive in an … Read more
If it’s static content then it will be cached in memory by default (unless there isn’t any memory left), just not by nginx, but OS – all that will be left disk-side will be stat(). If you want 100% memory solution you can just configure ramdisk and serve data from there.
Well, I see ~3.2 gigabytes of Driver Locked memory, which immediately stands out as suspicious. This kind of memory, Driver Locked memory, is memory that has been locked by a kernel-mode driver. Typically for the purpose of transferring small amounts of data, usually for short periods of time. So if you have a large chunk … Read more
Just recently I read an article by one of Godaddy’s engineers about this very topic: Learning to Deal with Learning On their hardware (Dell PERC cards) battery learning cycle happens every 90 days, but no way to know when exactly it’ll happen, ie during peak or off-peak hours. They talked about different solutions: Outright disable … Read more
You don’t need to specify scheme for hostname and you may use strict match instead of regex: varnishadm -T 127.0.0.1:6082 -S /etc/varnish/secret ban “req.http.host == example.com && req.url == /some/url/”
The tags for SSI and ESI are so similar that I wouldn’t worry about this overly much. Varnish only supports the most basic use of ESI anyway. Use SSI and nginx since you have them, and if you ever need the caching of Varnish, you’re only a trivial shell script away from changing your SSIs … Read more