Messages in this thread | ![/](/images/icornerl.gif) | | From | Andrey Borzenkov <> | Subject | Re: Does sysfs really provides persistent hardware path to devices? | Date | Mon, 28 Jul 2003 20:44:43 +0400 |
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On Saturday 26 July 2003 20:50, Greg KH wrote: > On Sat, Jul 26, 2003 at 08:36:13PM +0400, Andrey Borzenkov wrote: > > So apparently I cannot rely on sysfs to get reliable persistent > > information about physical location of devices. > > That is correct, but you can get pretty close :) >
sure, I know. The more annoying is how difficult is to step over this "close" :)
> > the point is - I want to create aliases that would point to specific > > slots. I.e. when I plug USB memory stick in upper slot on front panel I'd > > like to always create the same device alias for it. > > Look at the udev announcement I posted to linux-kernel yesterday to see > how to do this. >
I know udev.
udev does not answer my question. It operates on logical device (bus) numbers. My question was how to name devices based on physical position *independently* of logical numbers they get.
It is not strictly speaking udev fault but simply result of kernel exporting logical device names instead of true physical paths. I miss Solaris /devices filesystem ...
OK I may mot see something obvious. Simple example.
I have SCSI HBA sitting in PCI slot 3. It gets SCSI host number 1. I configure udev to name SCSI device 1.0.0.1 "database"
I add one more SCSI HBA in PCI slot 1. Next time system is booted *this* gets SCSI host number 1 and my first HBA in slot 3 gets SCSI host 2. Oops.
Question: how to configure udev so that "database" always refers to LUN 0 on target 0 on bus 0 on HBA in PCI slot 1.
> thanks, >
I thank you
-andrey
PS this obviously applies not only to SCSI. It is just it is most simple example and you do not open network interfaces by name so there is *no* way at all to assign their numbers :( - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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