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If a result is generated it is sent to standard output, and the program exits with a zero value. If no identifier is output, the program exits with a non-zero value.
scsi_id is primarily for use by other utilities such as udev that require a unique SCSI identifier.
By default all devices are assumed black listed, the --whitelisted option must be specified on the command line or in the config file for any useful behaviour.
SCSI commands are sent directly to the device via the SG_IO ioctl interface.
In order to generate unique values for either page 0x80 or page 0x83, the serial numbers or world wide names are prefixed as follows.
Identifiers based on page 0x80 are prefixed by the character 'S', the SCSI vendor, the SCSI product (model) and then the the serial number returned by page 0x80. For example:
# /lib/udev/scsi_id --page=0x80 --whitelisted --device=/dev/sda SIBM 3542 1T05078453
Identifiers based on page 0x83 are prefixed by the identifier type followed by the page 0x83 identifier. For example, a device with a NAA (Name Address Authority) type of 3 (also in this case the page 0x83 identifier starts with the NAA value of 6):
# /lib/udev/scsi_id --page=0x83 --whitelisted --device=/dev/sda 3600a0b80000b174b000000d63efc5c8c
The default behaviour is to query the available VPD pages, and use page 0x83 if found, else page 0x80 if found, else nothing.
Page pre-spc3-83 should only be utilized for those scsi devices which are not compliant with the SPC-2 or SPC-3 format for page 83. While this option is used for older model 4, 5, and 6 EMC Symmetrix devices, its use with SPC-2 or SPC-3 compliant devices will fallback to the page 83 format supported by these devices.