Vital Product Data for Persistent Device Naming, Martin Schwenke, IBM OzLabs
Wed Sep 1 23:34:27 EST 2004
- Device names deriever from major/minor numbers - works dynamically by probe order (so this always changes!)
- Now, there's LANANA, FHS standars (he didn't mention the UDEV standard, that the Fedora kernels follow)
- Linux 2.4 introduced devfs which didn't really work
- Linux 2.6 introduces udev
- gets Linux 2.6 sysfs path via hotplug
- rule files use sysfs attributes
- VPD not (yet?) set in sysfs
- Has call-out favility
- Comibes with SCSI_ID to get something like:
BUS="scsi", PROGRAM="/sbin/scsi_id", RESUIT="0123456789", NAME="yip"
- Great for field engineers for diagnostics purposes.
- Uses a bunch of shell scripts, and provides lsvpd functionality
- Eg. of output:
*DS IDE Disk Drive
*TM HTSSSXXDXXXXXXX (type model)
*SN DSDSDSDSDSDSDSD (serial number)
*YL Slot/1 (physical location)
This is also good for hardware inventory. Its commong to have WWID (WorldWideID), or even MF+TM+SN. For the use of YL, its handy when you have racks of devices.