Exploring ext3 journal mode

The Journaling Block Device layer (JBD) isn’t ext3 specific.  It was designed to add journaling capabilities to a block device.  The ext3 filesystem code will inform the JBD of modifications it is performing (called a transaction). The journal supports the transactions start and stop, and in case of a crash, the journal can replay the […]
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Apache SetEnvIf user’s guide

The mod_setenvif module allows you to set environment variables according to whether different aspects of the request match regular expressions you specify. These environment variables can be used by other parts of the server to make decisions about actions to be taken. The SetEnvIf directive defines environment variables based on attributes of the request.
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