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In some high-availability setups, root and boot disks of a Linux installation are copied to remote sites that can take over execution of a Linux workload in case of an outage of the original site. A site in this context is an execution environment such as an LPAR or z/VM guest. Each site may provide a different set of devices, or require different parameters to be applied per device. chzdev supports site-specific device configuration for up to 10 sites. Each site is identified by a number in the range 0 to 9. You can provide a separate set of persistent device configuration for each site. The IPL Load parameter value specified during boot determines the currently active site. Only the device configuration of the active site is applied during boot and when new devices become available. A common configuration can be provided that is applied when no site-specific configuration is available for a device in the active site. User can use the --site parameter to configure devices for a specific site only. Configuration actions without a site parameter apply to the common configuration. During the boot, the active site configuration is chosed based on the IPL LOADPARM variable. If the LOADPARM contains no valid site-id (0 to 9), the fallback-site id will be used. The fallback-site-id can also be configured with the zdev tools by not specifying the --site parameter. Some of the new chzdev/lszdev commands with site-parameter can be as follows 1. chzdev -ep f001 --site 3 This command is used to configure the device f001 for the site 3. During boot, if the LOADPARM value is S3, this device configuration will be used. 2. lszdev --site 3 This command lists all the devices which are configured for site 3. 3. chzdev -ep f001 Above command does not have a --site parameter. This device settings will be used for the following conditions 1. When the loadparm specifies a site, (e.g S3), and the device does not have an associated config-set, zdev uses fallback config set. 2. When the loadparm does not specify any site information, then the fallback config set will be used. When the loadparm specifies a site, and the device does not have an associated config set, nor a fallback site, nothing is configured for this device. Reviewed-by: Peter Oberparleiter <oberpar@linux.ibm.com> Signed-off-by: Vineeth Vijayan <vneethv@linux.ibm.com> Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>