Re: [PATCH] SCSI device/adapter/bus address correlation?

[Patrick Mansfield <patmans@us.ibm.com>]

On Fri, Sep 03, 2004 at 08:44:40AM -0600, Bjorn Helgaas wrote:
> On Thursday 02 September 2004 5:36 pm, James Bottomley wrote:
> > On Thu, 2004-09-02 at 19:19, Bjorn Helgaas wrote:
> > > Not being a real SCSI person, I'm sure there's some clever way I'm
> > > supposed to figure out which disk is /dev/sda.  But sometimes it's
> > > not clear from the kernel boot messages, particularly for drivers
> > > that don't print the PCI address of the adapter.
> > 
> > You do it like this:
> > 
> > jejb@gsyprf11> ls -l /sys/block/sda/device
> > lrwxrwxrwx  1 root root 0 Aug 22 10:57 /sys/block/sda/device ->
> > ../../devices/parisc0/parisc0:0/pci0000:00/0000:00:01.1/host1/1:0:15:0/
> 
> Thanks, I knew there must be a cool way.  That doesn't help if you're
> trying to figure out the correct "root=" to boot your box, of course...

What exactly is the "root=" problem? You mean device names changing?

Also lsscsi gives simple easy to read output. 

http://www.torque.net/scsi/lsscsi.html

[elm3a211 patman]$ lsscsi
[0:0:0:0]    enclosu IBM      EXP700           9319  -       
[0:0:1:0]    disk    IBM-ESXS ST318453FC    F  B953  /dev/sda
[0:0:2:0]    disk    IBM-ESXS ST318453FC    F  B953  /dev/sdb
[0:0:3:0]    enclosu IBM      EXP700           9319  -       
[0:0:4:0]    disk    IBM-ESXS ST318453FC    F  B953  /dev/sdc
[0:0:5:0]    disk    IBM-ESXS ST318453FC    F  B953  /dev/sdd

I[elm3a211 patman]$ lsscsi -g
[0:0:0:0]    enclosu IBM      EXP700           9319  -         /dev/sg0
[0:0:1:0]    disk    IBM-ESXS ST318453FC    F  B953  /dev/sda  /dev/sg1
[0:0:2:0]    disk    IBM-ESXS ST318453FC    F  B953  /dev/sdb  /dev/sg2
[0:0:3:0]    enclosu IBM      EXP700           9319  -         /dev/sg3
[0:0:4:0]    disk    IBM-ESXS ST318453FC    F  B953  /dev/sdc  /dev/sg4
[0:0:5:0]    disk    IBM-ESXS ST318453FC    F  B953  /dev/sdd  /dev/sg5

I don't know if it works right with udev (i.e. I think it only prints
default kernel names, just those found under sysfs, so if you don't user
default kernels names with udev it might not show the correct /dev name).

-- Patrick Mansfield
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