Messages in this thread |  | | From | Andreas Dilger <> | Subject | Re: Linux not adhering to BIOS Drive boot order? | Date | Tue, 16 Jan 2001 14:18:26 -0700 (MST) |
| |
Kelsey Hudson writes: > however, this brings up an interesting question: what happens if two disks > (presumably from two different machines) have the same disk label? what > happens then? for instance, i have several linux machines both at my > workplace and my home. if for some reason one of these machines dies due > to hardware failure and i want to get stuff off the drives, i put the disk > containing the /home partition on the failed machine into a working > machine and reboot. What /home gets mounted then? the original /home or > the new one from the dead machine? (and don't say end users wouldn't > possibly do that... if they are adding hardware into their systems this is > by no means beyond their capabilities)
Don't do that (tm). You may still have that problem (or even all filesystems being mounted wrong) if you add a new drive to a SCSI chain. Likewise if you add an IDE controller, the controllers may be numbered differently...
> at least with physical device nodes i can say 'computer, you will mount > this partition on this mountpoint!' and be done with it.
If you use a UUID, you will never have conflicts (unless you do drive imaging, which is bad). The label is just a lot more convenient to use than the UUID.
> so tell me then, how would one discern between two partitions with the > same label?
It will pick the first one found, I guess. However, this still reduces the problem of drive renaming by 99%. It goes from "each time drives are added/moved/removed my system may be broken" to "if I insert two drives with the same label 50% chance my system is broken". I'll take the latter any day.
Cheers, Andreas -- Andreas Dilger \ "If a man ate a pound of pasta and a pound of antipasto, \ would they cancel out, leaving him still hungry?" http://www-mddsp.enel.ucalgary.ca/People/adilger/ -- Dogbert - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org Please read the FAQ at http://www.tux.org/lkml/
|  |