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Identifying Volumes: /dev/sdxn vs. UUID
by Kent Borg
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A while back I noticed that these days Linux (or at least Ubuntu) likes
to find volumes by UUID instead of what /dev file it falls under. A UUID is not very memorable, so I have been known to edit fstab and menu.lst to use the traditional naming. But I am now a fan. The cause is my external disk again. I had Ubuntu install on my external disk. Mostly to get grub set up right and prove to myself that it was possible. Then I copied my entire / partition from the internal to the external disk. Oh, I went back and put the correct UUIDs in fstab to find the new /home and /boot partitions on the external disk. I also edited menu.lst UUIDs to point to the correct external / partition. It works! On my W2 (in testing before sending it off) the external USB disk appears as /dev/sda, but on the other machines I have booted with this disk the external disk is /dev/sdb. By using UUIDs I can find the partitions no matter what traditional name they land under. Yes, I have to use (hd0,1) or (hd1,1) in menu.lst for grub to find the kernel in the two cases, but after that it finds everything. So if any ornery old cusses out there hate this new fangled UUID thing, you might reconsider... -kb, the Kent who tries to keep his ornery old cussedness under control. -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. _______________________________________________ Discuss mailing list Discuss@... http://lists.blu.org/mailman/listinfo/discuss |
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Re: Identifying Volumes: /dev/sdxn vs. UUID
by Jarod Wilson
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On Wed, 2008-07-02 at 10:14 -0400, Kent Borg wrote:
> A while back I noticed that these days Linux (or at least Ubuntu) likes > to find volumes by UUID instead of what /dev file it falls under. A > UUID is not very memorable, so I have been known to edit fstab and > menu.lst to use the traditional naming. > > But I am now a fan. The cause is my external disk again. > > I had Ubuntu install on my external disk. Mostly to get grub set up > right and prove to myself that it was possible. Then I copied my entire > / partition from the internal to the external disk. Oh, I went back and > put the correct UUIDs in fstab to find the new /home and /boot > partitions on the external disk. I also edited menu.lst UUIDs to point > to the correct external / partition. > > It works! > > On my W2 (in testing before sending it off) the external USB disk > appears as /dev/sda, but on the other machines I have booted with this > disk the external disk is /dev/sdb. By using UUIDs I can find the > partitions no matter what traditional name they land under. > > Yes, I have to use (hd0,1) or (hd1,1) in menu.lst for grub to find the > kernel in the two cases, but after that it finds everything. > > So if any ornery old cusses out there hate this new fangled UUID thing, > you might reconsider... What if you're not quite an ornery old cuss, but still dislike UUID? :) (at least, I'm assuming 30 isn't ornery old cuss territory yet...) I completely and totally understand the reason for using UUID, and I'm generally for it for most people (Fedora uses 'em by default now too). And mounting via /dev entry is also stupid. Fedora hasn't done that for several years now -- before UUID it was 'mount by label'. Mount by label is my preferred method to mount stuff -- yes, you can still have name collisions (consider someone mounting the system drive from one machine into another machine, where they have similar partitions and labels, which is why Fedora switched to UUID), but if you know what you're doing and you want something you can actually remember, labels work rather nicely. -- Jarod Wilson jarod@... -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. _______________________________________________ Discuss mailing list Discuss@... http://lists.blu.org/mailman/listinfo/discuss |
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Re: Identifying Volumes: /dev/sdxn vs. UUID
by Kent Borg
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Jarod Wilson wrote:
> Mount by label is my preferred method to mount stuff I didn't know that was possible. Cool! Can grub find the kernel that way too? -kb, the Kent who wishes gnome were better at letting him manipulate labels. -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. _______________________________________________ Discuss mailing list Discuss@... http://lists.blu.org/mailman/listinfo/discuss |
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Re: Identifying Volumes: /dev/sdxn vs. UUID
by Jarod Wilson
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On Wed, 2008-07-02 at 11:09 -0400, Kent Borg wrote:
> Jarod Wilson wrote: > > Mount by label is my preferred method to mount stuff > > I didn't know that was possible. Cool! Can grub find the kernel that > way too? Yep. Typical default used to be 'root=LABEL=/'. Since my laptop actually has 3 different installs on it, I have one set of entries with 'root=LABEL=fedora', one set with 'root=LABEL=rhel5' and one with 'root=LABEL=rawhide'. Example stanza: title Fedora (2.6.25.9-76.fc9.x86_64) root (hd0,0) kernel /vmlinuz-2.6.25.9-76.fc9.x86_64 ro root=LABEL=fedora initrd /initrd-2.6.25.9-76.fc9.x86_64.img -- Jarod Wilson jarod@... -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. _______________________________________________ Discuss mailing list Discuss@... http://lists.blu.org/mailman/listinfo/discuss |
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Re: Identifying Volumes: /dev/sdxn vs. UUID
by Kent Borg
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Jarod Wilson wrote:
> Yep. Typical default used to be 'root=LABEL=/'. Very cool. Thanks. -kb -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. _______________________________________________ Discuss mailing list Discuss@... http://lists.blu.org/mailman/listinfo/discuss |
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