Messages in this thread | | | From | (H. Peter Anvin) | Subject | Re: devfs | Date | 8 Aug 1998 03:51:31 GMT |
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Followup to: <199808071824.OAA29331@pretzel.normnet.org> By author: Jeff Garzik <jgarzik@pobox.com> In newsgroup: linux.dev.kernel > > If a user-level program will make sure my /dev entries are accurate on > boot-up, great! Is that possible? >
Yes; Eric Youngdale wrote a program called scsidev which does it for SCSI devices.
> > > 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. > > Convenient for whom? Kernel programmers or admins/users? > > What would you suggest as a smart approach to volume management? > > > 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 > > What would this look like in /etc/fstab? >
Probably something like:
uuid:"blah" /mnt/mydisk ...etc...
Yes, support needs to be added for it, but it is the right way to solve this problem; *most* reconfigurations of systems large enough for this to be an issue at all involve controller, bus, and/or ID changes, which means that volume labels and uuids are what matters, not "location".
-hpa
-- PGP: 2047/2A960705 BA 03 D3 2C 14 A8 A8 BD 1E DF FE 69 EE 35 BD 74 See http://www.zytor.com/~hpa/ for web page and full PGP public key I am Bahá'í -- ask me about it or see http://www.bahai.org/ "To love another person is to see the face of God." -- Les Misérables
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