Re: devfs

Alan Cox (alan@lxorguk.ukuu.org.uk)
Fri, 7 Aug 1998 13:24:12 +0100 (BST)


> * You know exactly what devices you have. Under Solaris, a "boot -r"
> neatly creates the SCSI devices present, named precisely for their
> controller/SCSI/LUN id. Management couldn't be easier.

That doesn't need kernel help

> Putting devices in "scan order" never made sense to me. Why should
> the first SCSI drive scanned be /dev/sda? What happens when I switch
> the cables and drives around. Same filesystems, but the devices have
> all changed.

And this doesnt need kernel help either. In fact using device scan order is
often more convenient than device position. When it comes to volume management
of a big system both of these (and Solaris) are equally dumb approaches.

It all comes down to

mount `wherehasitgone --uuid=blah` /mnt/mydisk

And wherehasitgone is a tool to walk the disk tree and find a volume by uuid
and/or maybe ask LDAP/NIS maps to find it via NFS

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