iSCSI stands for Internet Small Computer Systems Interface, which is a protocol used to access block-level storage devices over the network. In Linux, it is possible to set up an iSCSI target to provide remote storage access to other systems, as well as an iSCSI initiator to access remote iSCSI targets.
To set up an iSCSI target in Linux, the following steps are generally required:
Install the iSCSI target software: There are several iSCSI target software packages available for Linux, such as LIO-Target, SCST, and tgt. The specific package may depend on the Linux distribution being used.
Configure the iSCSI target: The iSCSI target software needs to be configured with the storage devices that will be made available over the network, as well as the network interfaces and security settings to be used. This is typically done using a configuration file, such as /etc/tgt/targets.conf for the tgt package.
Start the iSCSI target service: Once the iSCSI target software is installed and configured, the service needs to be started to make the storage devices available over the network.
To set up an iSCSI initiator in Linux, the following steps are generally required:
Install the iSCSI initiator software: Most Linux distributions include an iSCSI initiator as part of their default installation, but it may need to be installed separately on some systems. The iSCSI initiator software package is typically called iscsi-initiator-utils or open-iscsi.
Discover the iSCSI target: The iSCSI initiator needs to discover the iSCSI target over the network before it can be accessed. This can be done using the iscsiadm command, which sends a discovery request to the target and retrieves the necessary information to connect to it.
Connect to the iSCSI target: Once the iSCSI target has been discovered, the iSCSI initiator can connect to it using the iscsiadm command. This creates a block device that can be used like any other locally attached storage device.
In both cases, it is important to ensure that the network connection between the iSCSI target and initiator is secure and reliable, as any interruptions or delays can affect the performance and reliability of the storage access.
Overall, iSCSI is a powerful and flexible technology that can be used to provide remote storage access in a variety of Linux-based environments. With the right configuration and management tools, it can be a valuable addition to any storage infrastructure.