RE: Did you try devlabel

[Gary_Lerhaupt@Dell.com]

Yeah, a generic disk.agent would probably be a good idea to handle the
devlabel calls and the rest of the agents could funnel through that or
whatever.  As for scsi_unique_id, its only good for SCSI devices.  I think
the man page should call this out clearly.  For IDE things, you get the
serial number from words 10-19 of /proc/ide/hd[a-z]/identify.

So, in the meantime, to get devlabel officially working through hotplug,
what direction should be taken?

Gary

-----Original Message-----
From: David Brownell [mailto:david-b@pacbell.net]
Sent: Friday, September 13, 2002 2:19 PM
To: Gary_Lerhaupt@exchange.dell.com
Cc: greg@kroah.com; Linux-hotplug-devel@lists.sourceforge.net
Subject: Re: Did you try devlabel


I'd kind of thought that this stuff should happen through some
kind of "disk" hotplug event.   And maybe the natural spot for
such calls is driverfs: for devices in the "disk" class; but it
could also be called directly from each of the bus-specific disk
drivers (IDE, SCSI-over-{SCSI,USB,IDE,Firewire,...}, Flash, etc).

Given such a hotplug event, I think this package would simplify
a bit -- "/etc/hotplug/disk.agent" would replace patches for all
current (and future) bus agents.  I'd prefer such a structure;
it could still handle SCSI of course.

I'd see SCSI hotplug as responsible for loading the SCSI disk or
cdrom driver ... and when those drivers found a device, they'd
trigger a "disk" hotplug event.  Which would have the benefit of
whatever smarts the bus-specific disk driver could share.

There've been a lot of discussions about how to identify disks,
multipathing and so on.  I think the conclusion was that some
user mode policy input was needed.  Your scsi_unique_id program
seems like it'd be important for a number of SCSI configs, and
could grow to handle the bigger ones.

- Dave

p.s. Was /dev/hda supposed to work as input to 'scsi_unique_id'?
      the man page implied it should, but that didn't work.
      And I'd expect /usr/sbin for such sysadin tools.




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