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What is persistent binding?

April 26, 2017Binding persistent

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What is persistent binding?

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Persistent binding is a feature of HBAs which remembers the last SCSI address a particular Fibre Channel target has been mapped to. For example, that a port on a physical disk (world wide name 01:02:03:04:05:06:07, LUN 0) was last seen at SCSI address (bus=0,target=3,lun=0) on the operating system. Persistent binding ensures that this is consistent from reboot to reboot unless changed by the user. Some HBA vendors automatically persistently bind devices, while others require manual configuration. Persistent binding is most important in the case of operating systems which remember devices by SCSI address, or in the case of raw volumes used by databases.