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authorDavid Zeuthen <davidz@redhat.com>2009-11-20 20:21:58 -0500
committerKay Sievers <kay.sievers@vrfy.org>2009-11-23 21:38:21 +0100
commit4e9fdfccbdd16f0cfdb5c8fa8484a8ba0f2e69d3 (patch)
treea033c562826b6a90c736837b4c128eb44f87c315 /rules
parent5d490002b339f33a033fe09cef4272afb38da676 (diff)
scsi_id: Export WWN and Unit Serial Number
Since the Unit Serial Number and the WWN are useful bits of information export them as properties in the udev database. These bits of information are often printed on the physical disk, see http://people.freedesktop.org/~david/FUJITSU-MAY2036RC-sas-disk-picture.jpg and displaying them separately in the UI (or in /dev/disk) might help users identify the physical disk. This patch exports these bits of information as ID_WWN and ID_SCSI_SERIAL. Note that ata_id also use the ID_WWN property since commit 66094a4a7fc1d303e80785d586800eae9841502b (2009-11-04). Also print out ID_SCSI=1 so users of the udev database knows the disk speaks SCSI. Here's the scsi_id output from one of my SAS disks with these changes: ID_SCSI=1 ID_VENDOR=FUJITSU ID_VENDOR_ENC=FUJITSU\x20 ID_MODEL=MAY2036RC ID_MODEL_ENC=MAY2036RC\x20\x20\x20\x20\x20\x20\x20 ID_REVISION=0103 ID_TYPE=disk ID_SERIAL=3500000e01b83f520 ID_SERIAL_SHORT=500000e01b83f520 ID_WWN=0x500000e01b83f520 ID_SCSI_SERIAL=B3G1P8500RWT Unfortunately we can't overload ID_SERIAL for two reasons 1. ID_SERIAL (and ID_SERIAL_SHORT) exported by scsi_id isn't really the unit serial number (as defined by SCSI) - it is sometimes the WWN (since it is more unique than the Unit Serial Number) and complex rules (to make the serial unique) govern what value to use. 2. It would break existing setups if the value of ID_SERIAL changed Signed-off-by: David Zeuthen <davidz@redhat.com>
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